Merge GUI background music into develop

Per-room OGG Vorbis background music in the Swing GUI: a testable MusicController
(idempotent track switch, null->silence, OFF disables) over an isolated
OggMusicBackend (vorbisspi/jorbis, streamed PCM, ~400ms gain fades, graceful on
missing files). Driven from GameIO.setMusic per turn (console no-op) and a new
persisted Music level (Off/Low/Med/High, default Medium) in Settings. Tracks come
from an external gitignored music/ folder via an optional rooms.yaml `music:`
field. Console stays silent.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/.gitignore

@@ -43,3 +43,6 @@ build/
 
 # Local save games and settings
 saves/
+
+# External background-music files (not bundled)
+music/

Semesterprojekt/docs/enhancement-ideas.md

@@ -129,6 +129,12 @@ des Bogens; einzelne Teilziele schalten je den nächsten Bereich frei.
 4. **Item-Kombination** – z.B. `match + candle → lit candle`. Achtung: v1.0 hat
    bewusst argloses `use X` ohne Targets gewählt → Command-Grammatik muss erweitert
    werden (jetzt erlaubt, da über MVP hinaus).
+   > ✅ umgesetzt (Branch `feature/use-x-on-y`): `use X on Y` als datengetriebene
+   > Rezepte (`combinations.yaml`: requires/consume/produce/effects/response/failText),
+   > Operanden aus Inventar oder Raum, reihenfolge-unabhängiger Paar-Key. Kein
+   > Parser-Eingriff (`on`/`with`/`to` sind bereits Filler). Selbst-Kombination
+   > (a==b) wird beim Laden abgelehnt. Demo: `matches` + `torch` → `lit_torch`
+   > (dauerhafte Lichtquelle).
 5. **Quest-Ketten + mehrere Enden** – Teilziele referenzieren Flags; Kette
    abschließen = Win; *welche* Flags gesetzt sind, entscheidet das Ende.
 
@@ -174,6 +180,14 @@ vorerst puzzle-fokussiert ohne Survival-Druck.
 
 ### 8. Musik (GUI)
 
+> ✅ umgesetzt (Branch `feature/music`): OGG Vorbis (vorbisspi/jorbis), pro Raum
+> via `music:`-Feld in `rooms.yaml`, externer gitignored `music/`-Ordner (nicht im
+> JAR). Idempotenter Track-Wechsel mit ~400 ms Fades; Räume ohne `music` blenden zu
+> Stille; gleicher Track läuft nahtlos weiter. Music-Stufe Off/Low/Med/High in den
+> Settings (Default Medium), persistiert. Konsole stumm. Testbarer `MusicController`
+> über isoliertes `OggMusicBackend`; fehlende Datei → still, kein Absturz. Siehe
+> `docs/music.md`.
+
 - Hintergrundmusik **nur in der GUI**.
 - **Pro Raum definierbar via YAML**: in `rooms.yaml` ein optionales Feld
   (z.B. `music: <dateiname>`), Dateien in *einem* Ordner.
@@ -189,8 +203,18 @@ vorerst puzzle-fokussiert ohne Survival-Druck.
 
 ## Festgelegte Erweiterungs-Entscheidungen
 
-> **Pathfinding** (BFS `go to <raum>`, Trie-Autocomplete) bleibt für eine
-> spätere Runde im Scope.
+> ✅ **Pathfinding** umgesetzt (Branch `feature/pathfinding-go-to`): `go to <raum>`
+> per BFS über besuchte Räume (Locks + Licht beachtet), via `GoCommand`
+> (Richtung vs. Raumziel). Konsole still + Zusammenfassung (Start/Mitte/Ziel),
+> GUI-Minikarte animiert pro Schritt (`GameIO.travelStep`, ~300 ms).
+> **Trie-Autocomplete** weiterhin für eine spätere Runde zurückgestellt.
+
+> ✅ **Tutorial** umgesetzt (Branch `feature/tutorial`): interaktiver Walkthrough
+> beim Neuen Spiel (look→examine→take→inventory→use→go→go to), verb-/alias-basierte
+> Abschluss-Erkennung (Bewegungs-Schritte verlangen echten Raumwechsel),
+> Abschluss-Tipps, jederzeit per `skip` abbrechbar. Datengetrieben (`tutorial.yaml`,
+> `TutorialLoader`), als `TutorialGuide` in den Game-Loop eingehängt; nur bei Neuem
+> Spiel, nicht beim Laden.
 
 | Entscheidung | Wert |
 |---|---|

Semesterprojekt/docs/music.md

@@ -0,0 +1,17 @@
+# Background music (GUI)
+
+Background music plays only in the Swing GUI. It is **data-driven and external**:
+
+- Put `.ogg` (OGG Vorbis) files in a `music/` folder next to where you run the game.
+  This folder is git-ignored and never bundled in the JAR.
+- A room plays a track via an optional `music:` field in `rooms.yaml`, e.g.
+  `music: manor-theme.ogg`. Entering a room with a different track fades the old one
+  out and the new one in (sequential, not an overlapping cross-fade);
+  a room with no `music:` field fades to silence; the same track keeps playing
+  seamlessly across rooms.
+- Volume is the **Music** setting (Off / Low / Medium / High) in the Settings menu,
+  persisted to `saves/settings.json`. Off disables playback.
+- Missing files are ignored (silent) — the game never crashes over absent audio.
+- The console version is always silent.
+
+Decoding uses the `vorbisspi` + `jorbis` libraries via the `javax.sound` SPI.

Semesterprojekt/docs/superpowers/plans/2026-06-01-music.md

@@ -0,0 +1,860 @@
+# GUI Background Music Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add per-room background music in the GUI — OGG tracks streamed from an external `music/` folder, fading on room change, with an Off/Low/Med/High Settings control. Console stays silent.
+
+**Architecture:** A testable `MusicController` holds the track/level decision logic (idempotent same-track, null→silence, OFF disables) and delegates raw operations to a `MusicBackend`. `OggMusicBackend` (the only audio/thread code, manually verified) decodes OGG via vorbisspi/jorbis and streams PCM through a `SourceDataLine` with gain fades. `GameIO.setMusic`/`setMusicLevel` are console no-ops; `SwingIO` owns the controller. `Game.publishHud` pushes the current room's track each turn; Settings carries a persisted `MusicLevel`.
+
+**Tech Stack:** Java 25, Maven, vorbisspi+jorbis (OGG), Jackson (YAML), JUnit 5 + AssertJ, Lombok.
+
+---
+
+## File Structure
+
+**Create:** `io/MusicLevel.java`, `io/MusicBackend.java`, `io/MusicController.java`, `io/OggMusicBackend.java`; tests `MusicLevelTest`, `MusicControllerTest`; `docs/music.md`.
+**Modify:** `io/GameIO.java` (seams), `io/SwingIO.java` (wire controller), `io/ConsoleIO.java` (none — inherits no-op), `game/Game.java` (publishHud), `App.java` (setMusic(null) + settings apply), `model/Room.java` + `loader/dto/RoomDto.java` + `loader/RoomFactory.java` (music field), `save/Settings.java` + `save/SettingsStore`-tests + `menu/SettingsMenu.java` + `test/.../menu/MenuTest.java`, `src/main/resources/world/rooms.yaml`, `pom.xml`, `.gitignore`, `docs/enhancement-ideas.md`.
+
+---
+
+## Task 1: `MusicLevel` enum
+
+**Files:** Create `src/main/java/thb/jeanluc/adventure/io/MusicLevel.java`; Test `src/test/java/thb/jeanluc/adventure/io/MusicLevelTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/io/MusicLevelTest.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicLevelTest {
+
+    @Test
+    void gainIncreasesWithLevel() {
+        assertThat(MusicLevel.LOW.gainDb()).isLessThan(MusicLevel.MEDIUM.gainDb());
+        assertThat(MusicLevel.MEDIUM.gainDb()).isLessThan(MusicLevel.HIGH.gainDb());
+    }
+
+    @Test
+    void isOnOnlyWhenNotOff() {
+        assertThat(MusicLevel.OFF.isOn()).isFalse();
+        assertThat(MusicLevel.LOW.isOn()).isTrue();
+        assertThat(MusicLevel.HIGH.isOn()).isTrue();
+    }
+
+    @Test
+    void nextCyclesThroughAllAndWraps() {
+        assertThat(MusicLevel.OFF.next()).isEqualTo(MusicLevel.LOW);
+        assertThat(MusicLevel.LOW.next()).isEqualTo(MusicLevel.MEDIUM);
+        assertThat(MusicLevel.MEDIUM.next()).isEqualTo(MusicLevel.HIGH);
+        assertThat(MusicLevel.HIGH.next()).isEqualTo(MusicLevel.OFF);
+    }
+}
+```
+
+- [ ] **Step 2: Run — expect FAIL** (`mvn -q test -Dtest=MusicLevelTest` → MusicLevel missing).
+
+- [ ] **Step 3: Create `MusicLevel`**
+
+`src/main/java/thb/jeanluc/adventure/io/MusicLevel.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+/** Background-music volume level, cycled in the Settings menu. */
+public enum MusicLevel {
+    OFF, LOW, MEDIUM, HIGH;
+
+    /** Target MASTER_GAIN in decibels. Irrelevant for {@link #OFF} (playback disabled). */
+    public float gainDb() {
+        return switch (this) {
+            case OFF -> Float.NEGATIVE_INFINITY;
+            case LOW -> -20f;
+            case MEDIUM -> -10f;
+            case HIGH -> 0f;
+        };
+    }
+
+    /** @return true when music should play. */
+    public boolean isOn() {
+        return this != OFF;
+    }
+
+    /** Next level in the cycle (wraps HIGH → OFF). */
+    public MusicLevel next() {
+        return values()[(ordinal() + 1) % values().length];
+    }
+}
+```
+
+- [ ] **Step 4: Run — PASS** (`mvn -q test -Dtest=MusicLevelTest`).
+- [ ] **Step 5: Commit** — `git add` the two files; `git commit -m "feat(io): MusicLevel enum (Off/Low/Med/High)"`.
+
+---
+
+## Task 2: `MusicBackend` + `MusicController`
+
+**Files:** Create `io/MusicBackend.java`, `io/MusicController.java`; Test `io/MusicControllerTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/io/MusicControllerTest.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicControllerTest {
+
+    /** Records backend calls for assertions. */
+    private static final class FakeBackend implements MusicBackend {
+        final List<String> calls = new ArrayList<>();
+        public void fadeTo(String track, float gainDb) { calls.add("fadeTo:" + track); }
+        public void fadeOut() { calls.add("fadeOut"); }
+        public void setGainDb(float gainDb) { calls.add("setGain:" + gainDb); }
+        public void shutdown() { calls.add("shutdown"); }
+    }
+
+    @Test
+    void firstRoomWithTrackPlaysAtDefaultLevel() {
+        FakeBackend b = new FakeBackend();
+        new MusicController(b).room("a");
+        assertThat(b.calls).containsExactly("fadeTo:a");
+    }
+
+    @Test
+    void sameTrackDoesNotRestart() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        b.calls.clear();
+        c.room("a");
+        assertThat(b.calls).isEmpty();
+    }
+
+    @Test
+    void differentTrackSwitches() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.room("b");
+        assertThat(b.calls).containsExactly("fadeTo:a", "fadeTo:b");
+    }
+
+    @Test
+    void nullOrBlankRoomFadesToSilence() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.room(null);
+        c.room("  ");
+        assertThat(b.calls).containsExactly("fadeTo:a", "fadeOut");
+    }
+
+    @Test
+    void offStopsAndIgnoresRooms() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.level(MusicLevel.OFF);
+        b.calls.clear();
+        c.room("b");
+        assertThat(b.calls).isEmpty();
+    }
+
+    @Test
+    void levelChangeSetsGain() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b); // default MEDIUM
+        c.level(MusicLevel.HIGH);
+        assertThat(b.calls).containsExactly("setGain:" + MusicLevel.HIGH.gainDb());
+    }
+
+    @Test
+    void turningOffThenOnReplaysOnNextRoom() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.level(MusicLevel.OFF);   // fadeOut
+        c.level(MusicLevel.MEDIUM); // setGain
+        b.calls.clear();
+        c.room("a");               // current was reset → plays again
+        assertThat(b.calls).containsExactly("fadeTo:a");
+    }
+}
+```
+
+- [ ] **Step 2: Run — expect FAIL.**
+
+- [ ] **Step 3: Create `MusicBackend`**
+
+`src/main/java/thb/jeanluc/adventure/io/MusicBackend.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+/** Raw audio operations — the only part that touches sound hardware. */
+public interface MusicBackend {
+
+    /** Fade the current track out, then start {@code track} (looping) and fade in to {@code gainDb}. */
+    void fadeTo(String track, float gainDb);
+
+    /** Fade the current track out and stop. */
+    void fadeOut();
+
+    /** Set the playback volume immediately. */
+    void setGainDb(float gainDb);
+
+    /** Stop playback and release resources. */
+    void shutdown();
+}
+```
+
+- [ ] **Step 4: Create `MusicController`**
+
+`src/main/java/thb/jeanluc/adventure/io/MusicController.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import java.util.Objects;
+
+/**
+ * Frontend-agnostic music decision logic. Idempotent per track (never restarts
+ * the same track), fades to silence on a null/blank track, and honours the
+ * {@link MusicLevel} (OFF disables playback). Delegates raw operations to a
+ * {@link MusicBackend}.
+ */
+public final class MusicController {
+
+    private final MusicBackend backend;
+    private MusicLevel level = MusicLevel.MEDIUM;
+    private String current; // currently selected track, or null = silence
+
+    public MusicController(MusicBackend backend) {
+        this.backend = backend;
+    }
+
+    /** Called per turn with the current room's music field (may be null/blank). */
+    public void room(String track) {
+        if (!level.isOn()) {
+            return;
+        }
+        String next = (track == null || track.isBlank()) ? null : track;
+        if (Objects.equals(next, current)) {
+            return;
+        }
+        current = next;
+        if (next == null) {
+            backend.fadeOut();
+        } else {
+            backend.fadeTo(next, level.gainDb());
+        }
+    }
+
+    /** Applies a new music level (volume / off). */
+    public void level(MusicLevel newLevel) {
+        this.level = newLevel;
+        if (!newLevel.isOn()) {
+            backend.fadeOut();
+            current = null; // turning back on replays on the next room() call
+        } else {
+            backend.setGainDb(newLevel.gainDb());
+        }
+    }
+
+    public void shutdown() {
+        backend.shutdown();
+    }
+}
+```
+
+- [ ] **Step 5: Run — PASS** (`mvn -q test -Dtest=MusicControllerTest`, 7 tests).
+- [ ] **Step 6: Commit** — `git commit -m "feat(io): MusicController + MusicBackend (testable music logic)"`.
+
+---
+
+## Task 3: `Room.music` field + loader
+
+**Files:** Modify `model/Room.java`, `loader/dto/RoomDto.java`, `loader/RoomFactory.java`, `src/main/resources/world/rooms.yaml`; Test `loader/RoomMusicTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/loader/RoomMusicTest.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.loader.dto.RoomDto;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class RoomMusicTest {
+
+    @Test
+    void musicFieldIsCarriedOntoRoom() {
+        RoomDto dto = new RoomDto("r", "Room", "d",
+                Map.of(), List.of(), List.of(), null, null, null, "theme.ogg");
+        Room room = RoomFactory.shellFromDto(dto);
+        assertThat(room.getMusic()).isEqualTo("theme.ogg");
+    }
+
+    @Test
+    void absentMusicIsNull() {
+        RoomDto dto = new RoomDto("r", "Room", "d", Map.of(), List.of(), List.of());
+        Room room = RoomFactory.shellFromDto(dto);
+        assertThat(room.getMusic()).isNull();
+    }
+}
+```
+
+- [ ] **Step 2: Run — expect FAIL** (no `getMusic`, RoomDto has no music arg).
+
+- [ ] **Step 3: Add `music` to `Room`**
+
+In `src/main/java/thb/jeanluc/adventure/model/Room.java`, after the `dark` field (which uses `@Setter`), add:
+```java
+    /** Optional GUI background-music track filename for this room; null = none. */
+    @Setter
+    private String music;
+```
+(`@Getter` on the class provides `getMusic()`; `@Setter` provides `setMusic(String)`, mirroring `dark`.)
+
+- [ ] **Step 4: Add `music` to `RoomDto`**
+
+In `src/main/java/thb/jeanluc/adventure/loader/dto/RoomDto.java`, add `String music` as the final record component and update the backward-compatible constructor:
+```java
+public record RoomDto(
+        String id,
+        String name,
+        String description,
+        Map<String, String> exits,
+        List<String> items,
+        List<String> npcs,
+        List<ExitLockDto> exitLocks,
+        List<DescriptionStateDto> descriptionStates,
+        Boolean dark,
+        String music
+) {
+    /** Backward-compatible constructor without the optional state fields. */
+    public RoomDto(String id, String name, String description,
+                   Map<String, String> exits, List<String> items, List<String> npcs) {
+        this(id, name, description, exits, items, npcs, null, null, null, null);
+    }
+}
+```
+
+- [ ] **Step 5: Carry it in `RoomFactory`**
+
+In `src/main/java/thb/jeanluc/adventure/loader/RoomFactory.java`, in `shellFromDto`, after `room.setDark(...)`:
+```java
+        room.setMusic(dto.music());
+```
+
+- [ ] **Step 6: Add demo `music:` fields**
+
+In `src/main/resources/world/rooms.yaml`, add a `music:` line to two rooms (files supplied externally; absent → silent). For the `kitchen` room add `  music: manor-theme.ogg` and for the `dungeon` room add `  music: dungeon-drone.ogg` (place the line among the room's other top-level keys, e.g. after its `description`).
+
+- [ ] **Step 7: Run — PASS** (`mvn -q test -Dtest=RoomMusicTest`), then `mvn -q clean test` (full suite green; WorldLoaderTest uses its own fixture base, unaffected by the production rooms.yaml `music:` additions).
+
+- [ ] **Step 8: Commit** — `git commit -m "feat(loader): per-room music field + demo rooms.yaml entries"`.
+
+---
+
+## Task 4: `GameIO` music seams + game-loop / app wiring
+
+**Files:** Modify `io/GameIO.java`, `game/Game.java`, `App.java`; Test `io/MusicSeamDefaultTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/io/MusicSeamDefaultTest.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicSeamDefaultTest {
+
+    @Test
+    void defaultMusicSeamsAreSilentNoOps() {
+        TestIO io = new TestIO();
+        io.setMusic("anything.ogg");
+        io.setMusic(null);
+        io.setMusicLevel(MusicLevel.HIGH);
+        assertThat(io.outputs()).isEmpty();
+    }
+}
+```
+
+- [ ] **Step 2: Run — expect FAIL** (no `setMusic`/`setMusicLevel`).
+
+- [ ] **Step 3: Add the default seams to `GameIO`**
+
+In `src/main/java/thb/jeanluc/adventure/io/GameIO.java`, add (MusicLevel is in the same package — no import needed):
+```java
+    /** Per-turn current-room music track; null/blank = silence. Console no-op; GUI plays. */
+    default void setMusic(String track) {
+        // no audio in text mode
+    }
+
+    /** Applies the music volume/level. Console no-op; GUI sets it. */
+    default void setMusicLevel(MusicLevel level) {
+        // no audio in text mode
+    }
+```
+
+- [ ] **Step 4: Push the current track each turn in `Game`**
+
+In `src/main/java/thb/jeanluc/adventure/game/Game.java`, at the END of `publishHud()` (after `setQuests(...)`):
+```java
+        ctx.getIo().setMusic(ctx.getPlayer().getCurrentRoom().getMusic());
+```
+
+- [ ] **Step 5: Silence music on return to menu in `App`**
+
+In `src/main/java/thb/jeanluc/adventure/App.java`, in `play(...)`, immediately after `game.run();`:
+```java
+        io.setMusic(null); // fade music out when returning to the menu
+```
+
+- [ ] **Step 6: Run — PASS** (`mvn -q test -Dtest=MusicSeamDefaultTest`), then `mvn -q clean test` (full suite green; console/loop tests unaffected — seams are no-ops).
+
+- [ ] **Step 7: Commit** — `git commit -m "feat(io): GameIO music seams; push room track per turn, silence at menu"`.
+
+---
+
+## Task 5: Settings `MusicLevel` + SettingsMenu refactor to `GameIO`
+
+**Files:** Modify `save/Settings.java`, `menu/SettingsMenu.java`, `App.java`, `test/.../menu/MenuTest.java`, `test/.../save/SettingsStoreTest.java`
+
+- [ ] **Step 1: Write the failing tests**
+
+Add to `src/test/java/thb/jeanluc/adventure/save/SettingsStoreTest.java` (keep existing tests; add imports `thb.jeanluc.adventure.io.MusicLevel`):
+```java
+    @Test
+    void musicLevelRoundTrips(@TempDir Path dir) {
+        SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
+        store.save(new Settings(ConsoleIO.ColorMode.AUTO, ConsoleIO.GlyphMode.UNICODE, MusicLevel.HIGH));
+        assertThat(store.load().musicLevel()).isEqualTo(MusicLevel.HIGH);
+    }
+
+    @Test
+    void oldSettingsWithoutMusicDefaultToMedium(@TempDir Path dir) throws Exception {
+        Path file = dir.resolve("settings.json");
+        Files.writeString(file, "{\"colorMode\":\"ON\",\"glyphMode\":\"ASCII\"}");
+        assertThat(new SettingsStore(file).load().musicLevel()).isEqualTo(MusicLevel.MEDIUM);
+    }
+```
+(Add `import java.nio.file.Files;` / `Path` / `@TempDir` if not already present — the existing tests already use `@TempDir`.)
+
+Update the music-toggle expectation in `src/test/java/thb/jeanluc/adventure/menu/MenuTest.java` — the existing `settingsMenuTogglesGlyphAndPersists` test calls `SettingsMenu.show(io, Settings.defaults(), store, new ConsoleIO())`. Change it to the new signature and account for the new "Music" row (options become Colour=1, Glyphs=2, Music=3, Back=4):
+```java
+    @Test
+    void settingsMenuTogglesGlyphAndPersists(@TempDir Path dir) {
+        SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
+        TestIO io = new TestIO().enqueue("2").enqueue("4"); // toggle Glyphs, then Back
+        Settings result = SettingsMenu.show(io, Settings.defaults(), store);
+        assertThat(result.glyphMode()).isEqualTo(ConsoleIO.GlyphMode.ASCII);
+        assertThat(store.load().glyphMode()).isEqualTo(ConsoleIO.GlyphMode.ASCII);
+    }
+```
+Add a music-cycle test:
+```java
+    @Test
+    void settingsMenuCyclesMusicLevelAndPersists(@TempDir Path dir) {
+        SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
+        TestIO io = new TestIO().enqueue("3").enqueue("4"); // cycle Music once, then Back
+        Settings result = SettingsMenu.show(io, Settings.defaults(), store);
+        assertThat(result.musicLevel()).isEqualTo(MusicLevel.MEDIUM.next()); // HIGH
+        assertThat(store.load().musicLevel()).isEqualTo(MusicLevel.MEDIUM.next());
+    }
+```
+(Add `import thb.jeanluc.adventure.io.MusicLevel;` to MenuTest.)
+
+- [ ] **Step 2: Run — expect FAIL** (Settings has no musicLevel; show signature differs).
+
+- [ ] **Step 3: Extend `Settings`**
+
+Replace `src/main/java/thb/jeanluc/adventure/save/Settings.java`:
+```java
+package thb.jeanluc.adventure.save;
+
+import thb.jeanluc.adventure.io.ConsoleIO;
+import thb.jeanluc.adventure.io.MusicLevel;
+
+/** Persisted user preferences (colour + glyph fidelity + music level). */
+public record Settings(ConsoleIO.ColorMode colorMode, ConsoleIO.GlyphMode glyphMode, MusicLevel musicLevel) {
+
+    public Settings {
+        if (musicLevel == null) {
+            musicLevel = MusicLevel.MEDIUM; // backward-compat: old saves lack this field
+        }
+    }
+
+    /** Backward-compatible constructor for callers that don't set music. */
+    public Settings(ConsoleIO.ColorMode colorMode, ConsoleIO.GlyphMode glyphMode) {
+        this(colorMode, glyphMode, MusicLevel.MEDIUM);
+    }
+
+    public static Settings defaults() {
+        return new Settings(ConsoleIO.ColorMode.AUTO, ConsoleIO.GlyphMode.UNICODE, MusicLevel.MEDIUM);
+    }
+}
+```
+
+- [ ] **Step 4: Refactor `SettingsMenu` to `GameIO` + add the Music row**
+
+Replace `src/main/java/thb/jeanluc/adventure/menu/SettingsMenu.java`:
+```java
+package thb.jeanluc.adventure.menu;
+
+import thb.jeanluc.adventure.io.ConsoleIO;
+import thb.jeanluc.adventure.io.GameIO;
+import thb.jeanluc.adventure.io.MusicLevel;
+import thb.jeanluc.adventure.save.Settings;
+import thb.jeanluc.adventure.save.SettingsStore;
+
+import java.util.List;
+
+/** Settings screen: cycle colour, glyph, and music level; persists + applies. */
+public final class SettingsMenu {
+
+    private SettingsMenu() {
+    }
+
+    /** Loops the settings screen until "Back", persisting + applying each change. */
+    public static Settings show(GameIO io, Settings current, SettingsStore store) {
+        Settings s = current;
+        while (true) {
+            int i = io.choose("SETTINGS", List.of(
+                    "Colour: " + s.colorMode(),
+                    "Glyphs: " + s.glyphMode(),
+                    "Music: " + s.musicLevel(),
+                    "Back"));
+            if (i == 0) {
+                s = new Settings(nextColor(s.colorMode()), s.glyphMode(), s.musicLevel());
+            } else if (i == 1) {
+                s = new Settings(s.colorMode(), nextGlyph(s.glyphMode()), s.musicLevel());
+            } else if (i == 2) {
+                s = new Settings(s.colorMode(), s.glyphMode(), s.musicLevel().next());
+            } else {
+                return s;
+            }
+            store.save(s);
+            apply(s, io);
+        }
+    }
+
+    /** Applies settings to the IO: music level always; colour/glyph only on the console. */
+    public static void apply(Settings s, GameIO io) {
+        io.setMusicLevel(s.musicLevel());
+        if (io instanceof ConsoleIO c) {
+            c.setColorMode(s.colorMode());
+            c.setGlyphMode(s.glyphMode());
+        }
+    }
+
+    private static ConsoleIO.ColorMode nextColor(ConsoleIO.ColorMode m) {
+        return switch (m) {
+            case AUTO -> ConsoleIO.ColorMode.ON;
+            case ON -> ConsoleIO.ColorMode.OFF;
+            case OFF -> ConsoleIO.ColorMode.AUTO;
+        };
+    }
+
+    private static ConsoleIO.GlyphMode nextGlyph(ConsoleIO.GlyphMode m) {
+        return switch (m) {
+            case UNICODE -> ConsoleIO.GlyphMode.ASCII;
+            case ASCII -> ConsoleIO.GlyphMode.GLYPH;
+            case GLYPH -> ConsoleIO.GlyphMode.UNICODE;
+        };
+    }
+}
+```
+
+- [ ] **Step 5: Update `App` call sites**
+
+In `src/main/java/thb/jeanluc/adventure/App.java`, in `run()`:
+- Remove the now-unused `ConsoleIO consoleIo = io instanceof ConsoleIO c ? c : null;` line (if it becomes unused after the changes below).
+- Change the startup apply to `SettingsMenu.apply(settings, io);`.
+- Change the SETTINGS case to `case SETTINGS -> settings = SettingsMenu.show(io, settings, settingsStore);`.
+
+(If `ConsoleIO` import becomes unused in `App.java`, remove it. `io` is the `GameIO`.)
+
+- [ ] **Step 6: Run — PASS** (`mvn -q test -Dtest=SettingsStoreTest,MenuTest,ConsoleIORenderTest`), then `mvn -q clean test` (full suite green).
+
+- [ ] **Step 7: Commit** — `git commit -m "feat(settings): persisted Music level; SettingsMenu applies via GameIO"`.
+
+---
+
+## Task 6: OGG dependency + `OggMusicBackend` + SwingIO wiring
+
+**Files:** Modify `pom.xml`, `io/SwingIO.java`, `.gitignore`; Create `io/OggMusicBackend.java`, `docs/music.md`. (No unit test — audio is manually verified per the no-GUI-test convention.)
+
+- [ ] **Step 1: Add the OGG dependencies to `pom.xml`**
+
+In the `<dependencies>` block:
+```xml
+        <!-- OGG Vorbis decoding (GUI background music) -->
+        <dependency>
+            <groupId>com.googlecode.soundlibs</groupId>
+            <artifactId>vorbisspi</artifactId>
+            <version>1.0.3.3</version>
+        </dependency>
+        <dependency>
+            <groupId>com.googlecode.soundlibs</groupId>
+            <artifactId>jorbis</artifactId>
+            <version>0.0.17.4</version>
+        </dependency>
+```
+Run `mvn -q -DskipTests compile` to confirm the dependencies resolve.
+
+- [ ] **Step 2: Create `OggMusicBackend`**
+
+`src/main/java/thb/jeanluc/adventure/io/OggMusicBackend.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import lombok.extern.slf4j.Slf4j;
+
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.FloatControl;
+import javax.sound.sampled.SourceDataLine;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+/**
+ * Streams OGG Vorbis tracks from the external {@code music/} folder through a
+ * {@link SourceDataLine}, looping, with ~400 ms gain fades. Decoding uses the
+ * vorbisspi/jorbis {@code javax.sound} SPI. All playback runs on a daemon
+ * thread; missing/undecodable files are logged and stay silent. GUI-only —
+ * verified manually.
+ */
+@Slf4j
+public final class OggMusicBackend implements MusicBackend {
+
+    private static final String MUSIC_DIR = "music";
+    private static final int FADE_MS = 400;
+    private static final int FADE_STEPS = 20;
+    private static final int BUFFER = 4096;
+    private static final float FLOOR_DB = -40f; // near-silence for fades
+
+    private volatile Thread playThread;
+    private volatile boolean stopping;
+    private volatile SourceDataLine line;
+    private volatile float targetGainDb = MusicLevel.MEDIUM.gainDb();
+
+    @Override
+    public synchronized void fadeTo(String track, float gainDb) {
+        stopCurrent();
+        targetGainDb = gainDb;
+        Path file = Path.of(MUSIC_DIR, track);
+        if (!Files.isReadable(file)) {
+            log.warn("Music file not found, staying silent: {}", file);
+            return;
+        }
+        stopping = false;
+        playThread = new Thread(() -> playLoop(file, gainDb), "music");
+        playThread.setDaemon(true);
+        playThread.start();
+    }
+
+    @Override
+    public synchronized void fadeOut() {
+        stopCurrent();
+    }
+
+    @Override
+    public synchronized void setGainDb(float gainDb) {
+        targetGainDb = gainDb;
+        SourceDataLine l = line;
+        if (l != null) {
+            applyGain(l, gainDb);
+        }
+    }
+
+    @Override
+    public synchronized void shutdown() {
+        stopCurrent();
+    }
+
+    /** Signals the play thread to stop and waits for its fade-out + cleanup. */
+    private void stopCurrent() {
+        Thread t = playThread;
+        if (t == null) {
+            return;
+        }
+        stopping = true;
+        try {
+            t.join(FADE_MS + 600L);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+        playThread = null;
+    }
+
+    private void playLoop(Path file, float gainDb) {
+        SourceDataLine l = null;
+        try {
+            while (!stopping) {
+                try (AudioInputStream in = AudioSystem.getAudioInputStream(file.toFile())) {
+                    AudioFormat base = in.getFormat();
+                    AudioFormat pcm = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+                            base.getSampleRate(), 16, base.getChannels(),
+                            base.getChannels() * 2, base.getSampleRate(), false);
+                    try (AudioInputStream din = AudioSystem.getAudioInputStream(pcm, in)) {
+                        if (l == null) {
+                            l = AudioSystem.getSourceDataLine(pcm);
+                            l.open(pcm);
+                            l.start();
+                            line = l;
+                            ramp(l, FLOOR_DB, gainDb); // fade in once
+                        }
+                        byte[] buf = new byte[BUFFER];
+                        int n;
+                        while (!stopping && (n = din.read(buf, 0, buf.length)) != -1) {
+                            l.write(buf, 0, n);
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Music playback failed for {}: {}", file, e.getMessage());
+        } finally {
+            if (l != null) {
+                try {
+                    ramp(l, currentGain(l), FLOOR_DB); // fade out
+                } catch (RuntimeException ignored) {
+                    // best-effort fade
+                }
+                l.stop();
+                l.close();
+            }
+            line = null;
+        }
+    }
+
+    private void ramp(SourceDataLine l, float fromDb, float toDb) {
+        for (int i = 0; i <= FADE_STEPS; i++) {
+            applyGain(l, fromDb + (toDb - fromDb) * i / FADE_STEPS);
+            sleep(FADE_MS / FADE_STEPS);
+        }
+    }
+
+    private float currentGain(SourceDataLine l) {
+        try {
+            return ((FloatControl) l.getControl(FloatControl.Type.MASTER_GAIN)).getValue();
+        } catch (IllegalArgumentException e) {
+            return targetGainDb;
+        }
+    }
+
+    private void applyGain(SourceDataLine l, float db) {
+        try {
+            FloatControl gain = (FloatControl) l.getControl(FloatControl.Type.MASTER_GAIN);
+            gain.setValue(Math.max(gain.getMinimum(), Math.min(gain.getMaximum(), db)));
+        } catch (IllegalArgumentException ignored) {
+            // line has no master-gain control on this platform
+        }
+    }
+
+    private void sleep(long ms) {
+        try {
+            Thread.sleep(ms);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+}
+```
+If any call doesn't compile against the installed vorbisspi/`javax.sound` API, adjust minimally to compile while preserving the behaviour (decode OGG→PCM, stream with looping, MASTER_GAIN fades, graceful on missing file). This class is manually verified.
+
+- [ ] **Step 3: Wire the controller into `SwingIO`**
+
+In `src/main/java/thb/jeanluc/adventure/io/SwingIO.java`:
+- Add a field (with the other final fields): `private final MusicController music = new MusicController(new OggMusicBackend());`
+- Add the overrides (near `setMap`):
+```java
+    @Override
+    public void setMusic(String track) {
+        music.room(track);
+    }
+
+    @Override
+    public void setMusicLevel(MusicLevel level) {
+        music.level(level);
+    }
+```
+(`MusicController`/`MusicLevel`/`OggMusicBackend` are in the same `io` package — no imports needed.)
+
+- [ ] **Step 4: Ignore the music folder**
+
+Append to `.gitignore`:
+```
+# External background-music files (not bundled)
+music/
+```
+
+- [ ] **Step 5: Document the music folder**
+
+Create `docs/music.md`:
+```markdown
+# Background music (GUI)
+
+Background music plays only in the Swing GUI. It is **data-driven and external**:
+
+- Put `.ogg` (OGG Vorbis) files in a `music/` folder next to where you run the game.
+  This folder is git-ignored and never bundled in the JAR.
+- A room plays a track via an optional `music:` field in `rooms.yaml`, e.g.
+  `music: manor-theme.ogg`. Entering a room with a different track cross-fades to it;
+  a room with no `music:` field fades to silence; the same track keeps playing
+  seamlessly across rooms.
+- Volume is the **Music** setting (Off / Low / Medium / High) in the Settings menu,
+  persisted to `saves/settings.json`. Off disables playback.
+- Missing files are ignored (silent) — the game never crashes over absent audio.
+- The console version is always silent.
+
+Decoding uses the `vorbisspi` + `jorbis` libraries via the `javax.sound` SPI.
+```
+
+- [ ] **Step 6: Build + full suite + manual check**
+
+Run: `mvn -q clean test` → BUILD SUCCESS (all prior + new tests; the audio backend has no unit test).
+Manual (optional, needs audio): drop an `.ogg` as `music/manor-theme.ogg`, launch the GUI, New Game → the kitchen should play it; move to the dungeon → it cross-fades to `dungeon-drone.ogg` (or silence if absent); Settings → Music cycles volume/off.
+
+- [ ] **Step 7: Commit** — `git add` pom.xml, OggMusicBackend, SwingIO, .gitignore, docs/music.md; `git commit -m "feat(io): OggMusicBackend + SwingIO wiring; music/ folder + docs"`.
+
+---
+
+## Task 7: Backlog doc
+
+**Files:** Modify `docs/enhancement-ideas.md`
+
+- [ ] **Step 1:** Under section **8. Musik (GUI)**, add a `> ✅ umgesetzt (Branch feature/music)` note mirroring the existing ✅ style: OGG Vorbis (vorbisspi/jorbis), per-room `music:` in rooms.yaml, external gitignored `music/` folder, idempotent track switch with ~400 ms fades, fade-to-silence in unscored rooms, Music level Off/Low/Med/High in Settings (default Medium), console silent; testable `MusicController` over an isolated `OggMusicBackend`.
+
+- [ ] **Step 2: Commit** — `git commit -m "docs: mark GUI background music implemented"`.
+
+---
+
+## Final Verification
+
+- [ ] `mvn -q clean test` — all tests pass (211 prior + MusicLevel/MusicController/RoomMusic/MusicSeam + extended Settings/Menu suites).
+- [ ] OGG dependencies resolve; project compiles.
+- [ ] Manual GUI smoke (optional, with an `.ogg`): room music plays/fades; Settings Music Off silences it; console run is silent.
+- [ ] Load a saved game from before this feature → defaults to Medium, no crash.
+- [ ] `git status` clean (no `music/` tracked).
+```

Semesterprojekt/docs/superpowers/plans/2026-06-01-pathfinding-go-to.md

@@ -0,0 +1,609 @@
+# `go to <room>` Pathfinding Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add `go to <room>` — BFS auto-walk over visited rooms (respecting locked exits + darkness), routed through `GoCommand`, with a silent console summary and an animated GUI minimap.
+
+**Architecture:** A new stateless `Pathfinder` (game package, next to `Conditions`/`Effects`/`Light`) does BFS over visited rooms using the same passability gates `GoCommand` enforces. `GoCommand` gains a branch: a directional arg moves one step (unchanged); a non-direction arg resolves a visited room by id/name and auto-walks the path. Per step it pushes a map frame via a new `GameIO.travelStep(MapView)` hook — a console no-op, overridden by `SwingIO` to repaint + briefly sleep so the minimap animates.
+
+**Tech Stack:** Java 25, Maven, JUnit 5 + AssertJ, Lombok.
+
+---
+
+## File Structure
+
+**Create:**
+- `src/main/java/thb/jeanluc/adventure/game/Pathfinder.java` — BFS over visited rooms.
+
+**Modify:**
+- `io/GameIO.java` — add `travelStep(MapView)` default no-op.
+- `io/SwingIO.java` — override `travelStep` (setMap + ~300ms sleep).
+- `command/impl/GoCommand.java` — extract `moveDirection`; add `goToRoom` (resolve + path + walk + summary).
+- `docs/enhancement-ideas.md` — mark pathfinding implemented.
+
+---
+
+## Task 1: `GameIO.travelStep` hook + `SwingIO` animation
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/io/GameIO.java`
+- Modify: `src/main/java/thb/jeanluc/adventure/io/SwingIO.java`
+- Test: `src/test/java/thb/jeanluc/adventure/io/TravelStepDefaultTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/io/TravelStepDefaultTest.java`:
+```java
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.text.MapView;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TravelStepDefaultTest {
+
+    @Test
+    void defaultTravelStepIsSilentNoOp() {
+        TestIO io = new TestIO();
+        // An empty map view is fine; the default must not print or throw.
+        io.travelStep(new MapView(List.of(), List.of()));
+        assertThat(io.outputs()).isEmpty();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=TravelStepDefaultTest`
+Expected: FAIL — `travelStep` is not defined on `GameIO`.
+
+- [ ] **Step 3: Add the default to `GameIO`**
+
+In `src/main/java/thb/jeanluc/adventure/io/GameIO.java`, add the import (if missing it is already there — `MapView` is used by `setMap`) and the method:
+```java
+    /**
+     * One frame of an auto-walk (the {@code go to} command), as the player moves
+     * through a room en route. Default is a no-op: text mode travels silently.
+     * The GUI overrides this to repaint the map and pace the animation.
+     *
+     * @param view the map snapshot at this step
+     */
+    default void travelStep(MapView view) {
+        // no animation in text mode
+    }
+```
+
+- [ ] **Step 4: Override in `SwingIO`**
+
+In `src/main/java/thb/jeanluc/adventure/io/SwingIO.java`:
+1. Add a constant near the other size constants (e.g. below `SMALL_SIZE`):
+```java
+    /** Delay between rooms while animating a go-to auto-walk, in milliseconds. */
+    private static final long TRAVEL_STEP_MS = 300L;
+```
+2. Add the override (place it near `setMap`):
+```java
+    @Override
+    public void travelStep(MapView view) {
+        setMap(view);
+        try {
+            Thread.sleep(TRAVEL_STEP_MS);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+```
+(`setMap` already calls `map.show(view)` which repaints on the EDT; the sleep on the game-loop worker thread lets each frame render. `MapView` is already imported in `SwingIO`.)
+
+- [ ] **Step 5: Run tests**
+
+Run: `mvn -q test -Dtest=TravelStepDefaultTest`
+Expected: PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/io/GameIO.java \
+        src/main/java/thb/jeanluc/adventure/io/SwingIO.java \
+        src/test/java/thb/jeanluc/adventure/io/TravelStepDefaultTest.java
+git commit -m "feat(io): travelStep hook for animated auto-walk (console no-op, Swing override)"
+```
+
+---
+
+## Task 2: `Pathfinder` BFS
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/game/Pathfinder.java`
+- Test: `src/test/java/thb/jeanluc/adventure/game/PathfinderTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/game/PathfinderTest.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PathfinderTest {
+
+    private Room room(String id) {
+        return new Room(id, id, "d");
+    }
+
+    private GameContext ctx(Room start, List<Room> all, Set<String> visited) {
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        for (Room r : all) {
+            rooms.put(r.getId(), r);
+        }
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(start, 0);
+        p.getVisitedRoomIds().addAll(visited);
+        return new GameContext(w, p, new TestIO());
+    }
+
+    @Test
+    void findsShortestPathOverVisitedRooms() {
+        Room a = room("a"), b = room("b"), c = room("c");
+        a.addExit(Direction.NORTH, b);
+        b.addExit(Direction.NORTH, c);
+        GameContext ctx = ctx(a, List.of(a, b, c), Set.of("a", "b", "c"));
+        assertThat(Pathfinder.findPath(ctx, c)).containsExactly(b, c);
+    }
+
+    @Test
+    void willNotRouteThroughUnvisitedRoom() {
+        Room a = room("a"), b = room("b"), c = room("c");
+        a.addExit(Direction.NORTH, b);
+        b.addExit(Direction.NORTH, c);
+        GameContext ctx = ctx(a, List.of(a, b, c), Set.of("a", "c")); // b not visited
+        assertThat(Pathfinder.findPath(ctx, c)).isEmpty();
+    }
+
+    @Test
+    void respectsLockedExit() {
+        Room a = room("a"), b = room("b");
+        a.addExit(Direction.NORTH, b);
+        a.addExitLock(Direction.NORTH,
+                new ExitLock(List.of(new Condition(Condition.Type.FLAG, "open")), "locked"));
+        GameContext ctx = ctx(a, List.of(a, b), Set.of("a", "b"));
+        assertThat(Pathfinder.findPath(ctx, b)).isEmpty();
+        ctx.getState().set("open");
+        assertThat(Pathfinder.findPath(ctx, b)).containsExactly(b);
+    }
+
+    @Test
+    void respectsDarkness() {
+        Room a = room("a");
+        Room dark = room("dark");
+        dark.setDark(true);
+        a.addExit(Direction.NORTH, dark);
+        GameContext ctx = ctx(a, List.of(a, dark), Set.of("a", "dark"));
+        assertThat(Pathfinder.findPath(ctx, dark)).isEmpty();
+        Item torch = PlainItem.builder().id("lit").name("Lit").description("d").light(true).build();
+        ctx.getPlayer().addItem(torch);
+        assertThat(Pathfinder.findPath(ctx, dark)).containsExactly(dark);
+    }
+
+    @Test
+    void unreachableTargetReturnsEmpty() {
+        Room a = room("a");
+        Room island = room("island"); // no connecting exits
+        GameContext ctx = ctx(a, List.of(a, island), Set.of("a", "island"));
+        assertThat(Pathfinder.findPath(ctx, island)).isEmpty();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=PathfinderTest`
+Expected: FAIL — `Pathfinder` does not exist.
+
+- [ ] **Step 3: Create `Pathfinder`**
+
+`src/main/java/thb/jeanluc/adventure/game/Pathfinder.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.Set;
+
+/**
+ * Breadth-first shortest-path search over the rooms the player has already
+ * visited, honouring the same gates as a manual move: locked exits and
+ * darkness. Stateless utility, alongside {@link Conditions}/{@link Effects}/
+ * {@link Light}.
+ */
+public final class Pathfinder {
+
+    private Pathfinder() {
+    }
+
+    /**
+     * Finds the shortest path from the player's current room to {@code target}.
+     *
+     * @param ctx    active game context
+     * @param target destination room (expected to be a visited room)
+     * @return the rooms to step through, excluding the start and ending at
+     *         {@code target}; empty if there is no currently-passable path
+     *         (or {@code target} is the current room)
+     */
+    public static List<Room> findPath(GameContext ctx, Room target) {
+        Room start = ctx.getPlayer().getCurrentRoom();
+        Set<String> visited = ctx.getPlayer().getVisitedRoomIds();
+
+        Queue<Room> queue = new ArrayDeque<>();
+        Map<Room, Room> cameFrom = new HashMap<>();
+        queue.add(start);
+        cameFrom.put(start, null);
+
+        while (!queue.isEmpty()) {
+            Room current = queue.poll();
+            if (current == target) {
+                return reconstruct(cameFrom, target);
+            }
+            for (Map.Entry<Direction, Room> exit : current.getExits().entrySet()) {
+                Room next = exit.getValue();
+                if (cameFrom.containsKey(next) || !visited.contains(next.getId())) {
+                    continue;
+                }
+                ExitLock lock = current.getExitLocks().get(exit.getKey());
+                if (lock != null && !Conditions.all(lock.requires(), ctx)) {
+                    continue;
+                }
+                if (!Light.isLit(ctx, next)) {
+                    continue;
+                }
+                cameFrom.put(next, current);
+                queue.add(next);
+            }
+        }
+        return List.of();
+    }
+
+    /** Walks predecessors back from target to start; returns steps after start. */
+    private static List<Room> reconstruct(Map<Room, Room> cameFrom, Room target) {
+        LinkedList<Room> path = new LinkedList<>();
+        for (Room r = target; r != null && cameFrom.get(r) != null; r = cameFrom.get(r)) {
+            path.addFirst(r);
+        }
+        return path;
+    }
+}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=PathfinderTest`
+Expected: PASS (5 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/game/Pathfinder.java \
+        src/test/java/thb/jeanluc/adventure/game/PathfinderTest.java
+git commit -m "feat(game): Pathfinder BFS over visited rooms (locks + light aware)"
+```
+
+---
+
+## Task 3: `GoCommand` — route, resolve, walk, summarize
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/command/impl/GoCommand.java`
+- Test: `src/test/java/thb/jeanluc/adventure/command/impl/GoCommandPathTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/command/impl/GoCommandPathTest.java`:
+```java
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class GoCommandPathTest {
+
+    /** kitchen --N--> hallway --N--> library (all lit). Optional lock on kitchen->hallway. */
+    private GameContext world(boolean lockHallway, String libraryName) {
+        Room kitchen = new Room("kitchen", "Kitchen", "d");
+        Room hallway = new Room("hallway", "Hallway", "d");
+        Room library = new Room("library", libraryName, "d");
+        kitchen.addExit(Direction.NORTH, hallway);
+        hallway.addExit(Direction.SOUTH, kitchen);
+        hallway.addExit(Direction.NORTH, library);
+        library.addExit(Direction.SOUTH, hallway);
+        if (lockHallway) {
+            kitchen.addExitLock(Direction.NORTH,
+                    new ExitLock(List.of(new Condition(Condition.Type.FLAG, "open")), "It's locked."));
+        }
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        rooms.put("kitchen", kitchen);
+        rooms.put("hallway", hallway);
+        rooms.put("library", library);
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(kitchen, 0);
+        p.getVisitedRoomIds().addAll(List.of("kitchen", "hallway", "library"));
+        return new GameContext(w, p, new TestIO());
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    @Test
+    void goToWalksToVisitedRoomById() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("library");
+        assertThat(out(ctx)).contains("make your way");
+    }
+
+    @Test
+    void resolvesByRoomName() {
+        // id "library" but type the display name (lower-cased) — still resolves
+        GameContext ctx = world(false, "Grand Library");
+        new GoCommand().execute(ctx, List.of("grand", "library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("library");
+    }
+
+    @Test
+    void unknownPlaceReportsSo() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("dungeon"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("kitchen");
+        assertThat(out(ctx)).contains("don't know any place called 'dungeon'");
+    }
+
+    @Test
+    void alreadyThere() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("kitchen"));
+        assertThat(out(ctx)).contains("already in the Kitchen");
+    }
+
+    @Test
+    void noPassablePathReportsSo() {
+        GameContext ctx = world(true, "Library"); // kitchen->hallway locked, flag unset
+        new GoCommand().execute(ctx, List.of("library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("kitchen");
+        assertThat(out(ctx)).contains("can't find a way there");
+    }
+
+    @Test
+    void directionalMoveStillWorks() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("north"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("hallway");
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=GoCommandPathTest`
+Expected: FAIL — `go to` routing not implemented (e.g. `goToWalksToVisitedRoomById` fails: "library" treated as an unknown direction).
+
+- [ ] **Step 3: Rewrite `GoCommand`**
+
+Replace `src/main/java/thb/jeanluc/adventure/command/impl/GoCommand.java`:
+```java
+package thb.jeanluc.adventure.command.impl;
+
+import thb.jeanluc.adventure.command.Command;
+import thb.jeanluc.adventure.game.Conditions;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.Light;
+import thb.jeanluc.adventure.game.Pathfinder;
+import thb.jeanluc.adventure.map.MapLayout;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Moves the player. {@code go <direction>} steps once to a connected room.
+ * {@code go to <room>} auto-walks the shortest path (BFS) over already-visited
+ * rooms, honouring locked exits and darkness. Usage: {@code go <direction>} or
+ * {@code go to <room>}.
+ */
+public class GoCommand implements Command {
+
+    @Override
+    public void execute(GameContext ctx, List<String> args) {
+        if (args.isEmpty()) {
+            ctx.getIo().write("Go where? Try 'go north' or 'go to <room>'.");
+            return;
+        }
+        try {
+            Direction dir = Direction.fromString(args.getFirst());
+            moveDirection(ctx, dir);
+        } catch (IllegalArgumentException notADirection) {
+            goToRoom(ctx, args);
+        }
+    }
+
+    /** Single-step move in a compass direction (the original behaviour). */
+    private void moveDirection(GameContext ctx, Direction dir) {
+        Room here = ctx.getPlayer().getCurrentRoom();
+        Optional<Room> next = here.getExit(dir);
+        if (next.isEmpty()) {
+            ctx.getIo().write("You can't go " + dir.getLabel() + " from here.");
+            return;
+        }
+        ExitLock lock = here.getExitLocks().get(dir);
+        if (lock != null && !Conditions.all(lock.requires(), ctx)) {
+            ctx.getIo().write(lock.blocked());
+            return;
+        }
+        if (!Light.isLit(ctx, next.get())) {
+            ctx.getIo().write("It's pitch black beyond the doorway — you need a lit light source "
+                    + "(try lighting your lamp with 'use lamp').");
+            return;
+        }
+        ctx.getPlayer().setCurrentRoom(next.get());
+        new LookCommand().execute(ctx, List.of());
+    }
+
+    /** Resolve a visited room by id/name and auto-walk the BFS path to it. */
+    private void goToRoom(GameContext ctx, List<String> args) {
+        String name = String.join(" ", args).toLowerCase();
+        Room target = resolveVisited(ctx, name);
+        if (target == null) {
+            ctx.getIo().write("You don't know any place called '" + name + "'.");
+            return;
+        }
+        Room start = ctx.getPlayer().getCurrentRoom();
+        if (target == start) {
+            ctx.getIo().write("You're already in the " + target.getName() + ".");
+            return;
+        }
+        List<Room> path = Pathfinder.findPath(ctx, target);
+        if (path.isEmpty()) {
+            ctx.getIo().write("You can't find a way there right now.");
+            return;
+        }
+        List<Room> route = new ArrayList<>();
+        route.add(start);
+        route.addAll(path);
+        for (Room step : path) {
+            ctx.getPlayer().setCurrentRoom(step);
+            ctx.getIo().travelStep(MapLayout.compute(
+                    ctx.getWorld(), ctx.getPlayer().getVisitedRoomIds(), step));
+        }
+        ctx.getIo().write(summary(route));
+        new LookCommand().execute(ctx, List.of());
+    }
+
+    /** Finds a visited room whose id or display name matches {@code name}. */
+    private Room resolveVisited(GameContext ctx, String name) {
+        for (String id : ctx.getPlayer().getVisitedRoomIds()) {
+            Room r = ctx.getWorld().getRooms().get(id);
+            if (r == null) {
+                continue;
+            }
+            if (id.equals(name) || r.getName().toLowerCase().equals(name)) {
+                return r;
+            }
+        }
+        return null;
+    }
+
+    /** Names start, destination, and at most one middle waypoint. */
+    private String summary(List<Room> route) {
+        int n = route.size();
+        String start = route.get(0).getName();
+        String dest = route.get(n - 1).getName();
+        if (n >= 3) {
+            String middle = route.get(n / 2).getName();
+            return "You make your way from the " + start + ", through the " + middle
+                    + ", to the " + dest + ".";
+        }
+        return "You make your way from the " + start + " to the " + dest + ".";
+    }
+
+    @Override
+    public String help() {
+        return "go <direction>  -  move one room (north/south/east/west); "
+                + "or  go to <room>  to travel to a known room";
+    }
+}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=GoCommandPathTest`
+Expected: PASS (6 tests).
+
+- [ ] **Step 5: Full suite (no regressions to existing go/movement tests)**
+
+Run: `mvn -q clean test`
+Expected: BUILD SUCCESS, all green (existing `GameTest`/command tests that use `go north` still pass).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/command/impl/GoCommand.java \
+        src/test/java/thb/jeanluc/adventure/command/impl/GoCommandPathTest.java
+git commit -m "feat(command): go to <room> auto-walk (BFS path, animated map, summary)"
+```
+
+---
+
+## Task 4: Docs
+
+**Files:**
+- Modify: `docs/enhancement-ideas.md`
+
+- [ ] **Step 1: Mark pathfinding implemented**
+
+In `docs/enhancement-ideas.md`, find the "Festgelegte Erweiterungs-Entscheidungen"
+area where the blockquote notes Pathfinding is *in scope for a later round* (added
+when main-menu/save-load shipped). Update that note to mark it done, in the existing
+`> ✅` style:
+
+> ✅ umgesetzt (Branch `feature/pathfinding-go-to`): `go to <raum>` per BFS über
+> besuchte Räume (Locks + Licht beachtet), via `GoCommand` (Richtung vs. Raumziel).
+> Konsole still + Zusammenfassung (Start/Mitte/Ziel), GUI-Minikarte animiert pro
+> Schritt (`GameIO.travelStep`, ~300 ms). Trie-Autocomplete weiter zurückgestellt.
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add docs/enhancement-ideas.md
+git commit -m "docs: mark go to <room> pathfinding implemented"
+```
+
+---
+
+## Final Verification
+
+- [ ] `mvn -q clean test` — all tests pass (184 prior + new Pathfinder/GoCommand/travelStep suites).
+- [ ] Manual GUI smoke (optional): start a game, walk kitchen→hallway→library manually (so they're visited), return to kitchen, then `go to library` — the minimap dot should step through the hallway to the library (~300ms each), then the library room renders with a summary line.
+- [ ] Manual console smoke (optional): same, confirming silent traversal + the "You make your way ..." line + destination look.
+- [ ] `git status` clean.

Semesterprojekt/docs/superpowers/plans/2026-06-01-tutorial.md

@@ -0,0 +1,822 @@
+# Interactive Start-of-Game Tutorial Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add an interactive, skippable start-of-game walkthrough that makes the player perform the core commands (look→examine→take→inventory→use→go→go-to) in the real starting room, then lists the rest, shown only on New Game.
+
+**Architecture:** A stateful `TutorialGuide` (game package) is layered onto the real `Game` loop (optional; null in normal/loaded play). It prints an instruction, and after each executed command checks — via alias-aware registry lookup, with movement steps requiring an actual room change — whether the step is satisfied (confirm + advance) or not (gentle hint). Steps come from an optional `tutorial.yaml` loaded by a standalone `TutorialLoader` into a `Tutorial`/`TutorialStep` model. `skip` ends it. `App` wires the guide only for New Game.
+
+**Tech Stack:** Java 25, Maven, Jackson (YAML), JUnit 5 + AssertJ, Lombok.
+
+---
+
+## File Structure
+
+**Create:**
+- `model/Tutorial.java`, `model/TutorialStep.java` — domain records.
+- `loader/dto/TutorialDto.java`, `loader/dto/TutorialStepDto.java` — YAML DTOs.
+- `loader/TutorialLoader.java` — reads optional `/world/tutorial.yaml` → `Tutorial`.
+- `game/TutorialGuide.java` — the guide.
+- `src/main/resources/world/tutorial.yaml` — intro + 7 steps + closing tips.
+- `src/test/resources/world/tutorial.yaml` — small 2-step loader fixture.
+
+**Modify:**
+- `game/Game.java` — optional guide field + `setTutorialGuide` + loop hooks.
+- `App.java` — `play(..., withTutorial)`, build guide on New Game.
+- `docs/enhancement-ideas.md` — note the tutorial.
+
+---
+
+## Task 1: Tutorial model, DTO, loader, content
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/model/Tutorial.java`
+- Create: `src/main/java/thb/jeanluc/adventure/model/TutorialStep.java`
+- Create: `src/main/java/thb/jeanluc/adventure/loader/dto/TutorialDto.java`
+- Create: `src/main/java/thb/jeanluc/adventure/loader/dto/TutorialStepDto.java`
+- Create: `src/main/java/thb/jeanluc/adventure/loader/TutorialLoader.java`
+- Create: `src/main/resources/world/tutorial.yaml`
+- Create: `src/test/resources/world/tutorial.yaml`
+- Test: `src/test/java/thb/jeanluc/adventure/loader/TutorialLoaderTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/loader/TutorialLoaderTest.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.model.Tutorial;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TutorialLoaderTest {
+
+    @Test
+    void loadsTheTestFixture() {
+        Tutorial t = new TutorialLoader().load(); // test-classpath /world/tutorial.yaml shadows prod
+        assertThat(t.isEmpty()).isFalse();
+        assertThat(t.intro()).isNotBlank();
+        assertThat(t.closingTips()).isNotBlank();
+        assertThat(t.steps()).hasSize(2);
+        assertThat(t.steps().getFirst().expect()).isEqualTo("look");
+        assertThat(t.steps().getFirst().minArgs()).isZero();
+    }
+
+    @Test
+    void missingFileReturnsEmptyTutorial() {
+        Tutorial t = new TutorialLoader("/no-such-base").load();
+        assertThat(t.isEmpty()).isTrue();
+        assertThat(t.steps()).isEmpty();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=TutorialLoaderTest`
+Expected: FAIL — `Tutorial`/`TutorialLoader` do not exist.
+
+- [ ] **Step 3: Create the model records**
+
+`src/main/java/thb/jeanluc/adventure/model/TutorialStep.java`:
+```java
+package thb.jeanluc.adventure.model;
+
+/**
+ * One interactive tutorial step: an instruction, the command that satisfies it
+ * ({@code expect} is a verb name like "look", or "go_direction"/"go_to_room"),
+ * a minimum argument count, a success confirmation, and a hint for a valid but
+ * wrong command.
+ */
+public record TutorialStep(
+        String instruction,
+        String expect,
+        int minArgs,
+        String confirm,
+        String hint
+) {
+}
+```
+
+`src/main/java/thb/jeanluc/adventure/model/Tutorial.java`:
+```java
+package thb.jeanluc.adventure.model;
+
+import java.util.List;
+
+/** Onboarding walkthrough: an intro, ordered steps, and closing tips. */
+public record Tutorial(String intro, List<TutorialStep> steps, String closingTips) {
+
+    public Tutorial {
+        steps = steps == null ? List.of() : List.copyOf(steps);
+    }
+
+    public boolean isEmpty() {
+        return steps.isEmpty();
+    }
+
+    /** An absent tutorial (no steps). */
+    public static Tutorial none() {
+        return new Tutorial(null, List.of(), null);
+    }
+}
+```
+
+- [ ] **Step 4: Create the DTOs**
+
+`src/main/java/thb/jeanluc/adventure/loader/dto/TutorialStepDto.java`:
+```java
+package thb.jeanluc.adventure.loader.dto;
+
+/** YAML representation of a tutorial step. */
+public record TutorialStepDto(
+        String instruction,
+        String expect,
+        Integer minArgs,
+        String confirm,
+        String hint
+) {
+}
+```
+
+`src/main/java/thb/jeanluc/adventure/loader/dto/TutorialDto.java`:
+```java
+package thb.jeanluc.adventure.loader.dto;
+
+import java.util.List;
+
+/** YAML representation of the tutorial document. */
+public record TutorialDto(String intro, List<TutorialStepDto> steps, String closingTips) {
+}
+```
+
+- [ ] **Step 5: Create `TutorialLoader`**
+
+`src/main/java/thb/jeanluc/adventure/loader/TutorialLoader.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import thb.jeanluc.adventure.loader.dto.TutorialDto;
+import thb.jeanluc.adventure.loader.dto.TutorialStepDto;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Loads the optional onboarding tutorial from {@code <base>/tutorial.yaml}.
+ * Kept separate from {@link WorldLoader}: the tutorial is onboarding, not world
+ * content. Returns {@link Tutorial#none()} when the file is absent.
+ */
+public class TutorialLoader {
+
+    /** Default classpath base directory. */
+    public static final String DEFAULT_BASE = "/world";
+
+    private final ObjectMapper yaml = new ObjectMapper(new YAMLFactory());
+    private final String basePath;
+
+    public TutorialLoader() {
+        this(DEFAULT_BASE);
+    }
+
+    public TutorialLoader(String basePath) {
+        this.basePath = basePath;
+    }
+
+    /** Reads the tutorial; absent file → {@link Tutorial#none()}. */
+    public Tutorial load() {
+        String resource = basePath + "/tutorial.yaml";
+        try (InputStream in = getClass().getResourceAsStream(resource)) {
+            if (in == null) {
+                return Tutorial.none();
+            }
+            TutorialDto dto = yaml.readValue(in, TutorialDto.class);
+            if (dto == null) {
+                return Tutorial.none();
+            }
+            List<TutorialStep> steps = new ArrayList<>();
+            if (dto.steps() != null) {
+                for (TutorialStepDto s : dto.steps()) {
+                    steps.add(new TutorialStep(
+                            s.instruction(),
+                            s.expect(),
+                            s.minArgs() == null ? 0 : s.minArgs(),
+                            s.confirm(),
+                            s.hint()));
+                }
+            }
+            return new Tutorial(dto.intro(), steps, dto.closingTips());
+        } catch (IOException e) {
+            throw new WorldLoadException("Failed to parse " + resource, e);
+        }
+    }
+}
+```
+
+- [ ] **Step 6: Create the production `tutorial.yaml`**
+
+`src/main/resources/world/tutorial.yaml`:
+```yaml
+intro: |
+  Welcome to the manor. Let me show you the ropes — just type the commands as
+  I describe them. (Type 'skip' at any time to jump straight into the game.)
+steps:
+  - instruction: "First, look around the room: type 'look'."
+    expect: look
+    confirm: "Good — 'look' (or 'l') re-describes wherever you are."
+    hint: "When you're ready, just type: look"
+  - instruction: "Examine something you noticed: 'examine <thing>' (or 'x <thing>')."
+    expect: examine
+    minArgs: 1
+    confirm: "That's how you inspect items, exits, and people up close."
+    hint: "Try examining something, e.g.: examine lamp"
+  - instruction: "Pick something up: 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Taken. Things you carry go into your inventory."
+    hint: "Pick something up, e.g.: take lamp"
+  - instruction: "Check what you're carrying: 'inventory' (or 'i')."
+    expect: inventory
+    confirm: "That's your inventory."
+    hint: "Type: inventory"
+  - instruction: "Use an item: 'use <item>' — try lighting the lamp."
+    expect: use
+    minArgs: 1
+    confirm: "Some items toggle, read, or react when you use them."
+    hint: "Use something, e.g.: use lamp"
+  - instruction: "Now move to another room: 'go <direction>' (try 'go north')."
+    expect: go_direction
+    confirm: "You can move north / south / east / west between connected rooms."
+    hint: "Head to a connected room, e.g.: go north"
+  - instruction: "Travel back to a room you've already seen: 'go to <room>'."
+    expect: go_to_room
+    confirm: "Nice — 'go to <room>' auto-walks to any room you've already visited."
+    hint: "Try: go to <a room you've already visited>"
+closingTips: |
+  That's the core. A few more you'll want:
+  read · drop · talk to <npc> · give <item> to <npc> ·
+  use <item> on <item> (combine things) · map · quests · save · menu.
+  Type 'help' anytime. Good luck.
+```
+
+- [ ] **Step 7: Create the test fixture `tutorial.yaml`**
+
+`src/test/resources/world/tutorial.yaml` (small, deterministic for the loader test):
+```yaml
+intro: |
+  Test intro.
+steps:
+  - instruction: "Look: type 'look'."
+    expect: look
+    confirm: "Looked."
+    hint: "Type look."
+  - instruction: "Take: type 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Took it."
+    hint: "Take something."
+closingTips: |
+  Test tips.
+```
+
+- [ ] **Step 8: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=TutorialLoaderTest`
+Expected: PASS (2 tests).
+
+- [ ] **Step 9: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/model/Tutorial.java \
+        src/main/java/thb/jeanluc/adventure/model/TutorialStep.java \
+        src/main/java/thb/jeanluc/adventure/loader/dto/TutorialDto.java \
+        src/main/java/thb/jeanluc/adventure/loader/dto/TutorialStepDto.java \
+        src/main/java/thb/jeanluc/adventure/loader/TutorialLoader.java \
+        src/main/resources/world/tutorial.yaml \
+        src/test/resources/world/tutorial.yaml \
+        src/test/java/thb/jeanluc/adventure/loader/TutorialLoaderTest.java
+git commit -m "feat(tutorial): Tutorial model + TutorialLoader + tutorial.yaml content"
+```
+
+---
+
+## Task 2: `TutorialGuide`
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/game/TutorialGuide.java`
+- Test: `src/test/java/thb/jeanluc/adventure/game/TutorialGuideTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/game/TutorialGuideTest.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.command.CommandParser;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.ParsedCommand;
+import thb.jeanluc.adventure.command.impl.ExamineCommand;
+import thb.jeanluc.adventure.command.impl.GoCommand;
+import thb.jeanluc.adventure.command.impl.InventoryCommand;
+import thb.jeanluc.adventure.command.impl.LookCommand;
+import thb.jeanluc.adventure.command.impl.TakeCommand;
+import thb.jeanluc.adventure.command.impl.UseCommand;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TutorialGuideTest {
+
+    private CommandRegistry registry() {
+        CommandRegistry r = new CommandRegistry();
+        r.register(new LookCommand(), "look", "l");
+        r.register(new ExamineCommand(), "examine", "x");
+        r.register(new TakeCommand(), "take", "get");
+        r.register(new InventoryCommand(), "inventory", "i");
+        r.register(new UseCommand(), "use");
+        r.register(new GoCommand(), "go", "move", "walk");
+        return r;
+    }
+
+    private final Room kitchen = new Room("kitchen", "Kitchen", "d");
+    private final Room hallway = new Room("hallway", "Hallway", "d");
+
+    private GameContext ctx() {
+        kitchen.addExit(Direction.NORTH, hallway);
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        rooms.put("kitchen", kitchen);
+        rooms.put("hallway", hallway);
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(kitchen, 0);
+        return new GameContext(w, p, new TestIO());
+    }
+
+    private ParsedCommand parse(String s) {
+        return new CommandParser().parse(s);
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    private TutorialStep step(String instr, String expect, int minArgs) {
+        return new TutorialStep(instr, expect, minArgs, "OK:" + expect, "HINT:" + expect);
+    }
+
+    @Test
+    void beginPrintsIntroAndFirstInstruction() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("INTRO", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        assertThat(out(ctx)).contains("INTRO").contains("do look");
+        assertThat(g.isActive()).isTrue();
+    }
+
+    @Test
+    void aliasSatisfiesVerbStepAndAdvancesToTips() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("INTRO", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("l")); // alias of look
+        assertThat(out(ctx)).contains("OK:look").contains("TIPS");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void minArgsGatesTakeStep() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("take it", "take", 1)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("take")); // no arg -> hint, not satisfied
+        assertThat(out(ctx)).contains("HINT:take");
+        assertThat(g.isActive()).isTrue();
+        g.onCommand(ctx, parse("take lamp")); // satisfied
+        assertThat(out(ctx)).contains("OK:take");
+    }
+
+    @Test
+    void goDirectionRequiresAnActualMove() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("move", "go_direction", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        // typed a direction but did NOT move -> hint
+        g.onCommand(ctx, parse("go north"));
+        assertThat(out(ctx)).contains("HINT:go_direction");
+        assertThat(g.isActive()).isTrue();
+        // now actually move, then the same command satisfies
+        ctx.getPlayer().setCurrentRoom(hallway);
+        g.onCommand(ctx, parse("go north"));
+        assertThat(out(ctx)).contains("OK:go_direction");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void goToRoomNeedsNonDirectionArgAndMove() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("travel", "go_to_room", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        ctx.getPlayer().setCurrentRoom(hallway); // moved
+        g.onCommand(ctx, parse("go kitchen")); // "kitchen" is not a direction
+        assertThat(out(ctx)).contains("OK:go_to_room");
+    }
+
+    @Test
+    void skipDeactivates() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.skip(ctx);
+        assertThat(out(ctx)).contains("Tutorial skipped");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void emptyTutorialIsInactive() {
+        TutorialGuide g = new TutorialGuide(Tutorial.none(), registry());
+        assertThat(g.isActive()).isFalse();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=TutorialGuideTest`
+Expected: FAIL — `TutorialGuide` does not exist.
+
+- [ ] **Step 3: Create `TutorialGuide`**
+
+`src/main/java/thb/jeanluc/adventure/game/TutorialGuide.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.command.Command;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.ParsedCommand;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+
+import java.util.Optional;
+
+/**
+ * Drives the interactive start-of-game walkthrough, layered onto the real game
+ * loop. Prints an instruction, then on each executed command decides whether the
+ * current step is satisfied (confirm + advance) or not (hint). Movement steps
+ * require an actual room change. Alias-aware via the {@link CommandRegistry}.
+ */
+public final class TutorialGuide {
+
+    private final Tutorial tutorial;
+    private final CommandRegistry registry;
+    private int index;
+    private boolean active;
+    private Room roomAtStepStart;
+
+    public TutorialGuide(Tutorial tutorial, CommandRegistry registry) {
+        this.tutorial = tutorial;
+        this.registry = registry;
+        this.active = !tutorial.isEmpty();
+    }
+
+    public boolean isActive() {
+        return active;
+    }
+
+    /** Prints the intro and the first instruction (call once at loop start). */
+    public void begin(GameContext ctx) {
+        if (!active) {
+            return;
+        }
+        if (tutorial.intro() != null && !tutorial.intro().isBlank()) {
+            ctx.getIo().write(tutorial.intro());
+        }
+        enterStep(ctx);
+    }
+
+    /** Evaluates the current step against the command that was just executed. */
+    public void onCommand(GameContext ctx, ParsedCommand parsed) {
+        if (!active) {
+            return;
+        }
+        TutorialStep step = tutorial.steps().get(index);
+        if (satisfies(step, ctx, parsed)) {
+            ctx.getIo().write(step.confirm());
+            index++;
+            if (index >= tutorial.steps().size()) {
+                if (tutorial.closingTips() != null && !tutorial.closingTips().isBlank()) {
+                    ctx.getIo().write(tutorial.closingTips());
+                }
+                active = false;
+            } else {
+                enterStep(ctx);
+            }
+        } else {
+            ctx.getIo().write(step.hint());
+        }
+    }
+
+    /** Ends the tutorial early (the 'skip' command). */
+    public void skip(GameContext ctx) {
+        if (active) {
+            ctx.getIo().write("Tutorial skipped.");
+            active = false;
+        }
+    }
+
+    private void enterStep(GameContext ctx) {
+        roomAtStepStart = ctx.getPlayer().getCurrentRoom();
+        ctx.getIo().write(tutorial.steps().get(index).instruction());
+    }
+
+    private boolean satisfies(TutorialStep step, GameContext ctx, ParsedCommand parsed) {
+        String expect = step.expect();
+        if ("go_direction".equals(expect)) {
+            return isGo(parsed) && firstIsDirection(parsed) && moved(ctx);
+        }
+        if ("go_to_room".equals(expect)) {
+            return isGo(parsed) && !firstIsDirection(parsed) && moved(ctx);
+        }
+        return sameCommand(parsed.verb(), expect) && parsed.args().size() >= step.minArgs();
+    }
+
+    private boolean isGo(ParsedCommand p) {
+        return sameCommand(p.verb(), "go") && !p.args().isEmpty();
+    }
+
+    private boolean firstIsDirection(ParsedCommand p) {
+        if (p.args().isEmpty()) {
+            return false;
+        }
+        try {
+            Direction.fromString(p.args().get(0));
+            return true;
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+    }
+
+    private boolean moved(GameContext ctx) {
+        return ctx.getPlayer().getCurrentRoom() != roomAtStepStart;
+    }
+
+    private boolean sameCommand(String a, String b) {
+        Optional<Command> ca = registry.find(a);
+        Optional<Command> cb = registry.find(b);
+        return ca.isPresent() && cb.isPresent() && ca.get() == cb.get();
+    }
+}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=TutorialGuideTest`
+Expected: PASS (7 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/game/TutorialGuide.java \
+        src/test/java/thb/jeanluc/adventure/game/TutorialGuideTest.java
+git commit -m "feat(game): TutorialGuide interactive walkthrough engine"
+```
+
+---
+
+## Task 3: Wire the guide into `Game` and `App`
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/game/Game.java`
+- Modify: `src/main/java/thb/jeanluc/adventure/App.java`
+- Test: `src/test/java/thb/jeanluc/adventure/game/GameTutorialTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/game/GameTutorialTest.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.command.CommandParser;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.impl.LookCommand;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class GameTutorialTest {
+
+    @Test
+    void guideBeginsAndAdvancesThenSkipEndsViaLoop() {
+        Room kitchen = new Room("kitchen", "Kitchen", "d");
+        World w = new World(Map.of("kitchen", kitchen), Map.of(), Map.of(), "t", "w");
+        TestIO io = new TestIO();
+        // scripted player input: a matching 'look', then 'skip'; then EOF (null) ends run()
+        io.enqueue("look").enqueue("skip");
+        GameContext ctx = new GameContext(new GameSession(w, new Player(kitchen, 0), "s"), io);
+
+        CommandRegistry registry = new CommandRegistry();
+        registry.register(new LookCommand(), "look", "l");
+
+        Tutorial t = new Tutorial("INTRO",
+                List.of(new TutorialStep("do look", "look", 0, "STEP1-OK", "hint"),
+                        new TutorialStep("do look again", "look", 0, "STEP2-OK", "hint")),
+                "TIPS");
+        Game game = new Game(ctx, registry, new CommandParser());
+        game.setTutorialGuide(new TutorialGuide(t, registry));
+
+        game.run();
+
+        String out = io.allOutput();
+        assertThat(out).contains("INTRO");      // begin printed
+        assertThat(out).contains("STEP1-OK");   // first 'look' advanced step 1
+        assertThat(out).contains("Tutorial skipped"); // 'skip' ended it before step 2 finished
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=GameTutorialTest`
+Expected: FAIL — `Game.setTutorialGuide` does not exist.
+
+- [ ] **Step 3: Add the guide hooks to `Game`**
+
+In `src/main/java/thb/jeanluc/adventure/game/Game.java`:
+
+1. Add the import:
+```java
+import thb.jeanluc.adventure.game.TutorialGuide;
+```
+(Same package — skip the import; reference `TutorialGuide` directly.)
+
+2. Add a field after `private boolean running = true;`:
+```java
+    /** Optional onboarding guide; null in normal/loaded play. */
+    private TutorialGuide tutorialGuide;
+
+    /** Wires the interactive tutorial (New Game only). */
+    public void setTutorialGuide(TutorialGuide tutorialGuide) {
+        this.tutorialGuide = tutorialGuide;
+    }
+```
+
+3. In `run()`, after the initial `publishHud(); maybeEnd();` and before `while (running) {`:
+```java
+        if (tutorialGuide != null) {
+            tutorialGuide.begin(ctx);
+        }
+```
+
+4. Inside the loop, replace the body from the `parsed.verb().isEmpty()` check through the dispatch with this (adds the skip interception and the post-command hook):
+```java
+            ParsedCommand parsed = parser.parse(input);
+            if (parsed.verb().isEmpty()) {
+                continue;
+            }
+            if (tutorialGuide != null && tutorialGuide.isActive()
+                    && parsed.verb().equals("skip")) {
+                tutorialGuide.skip(ctx);
+                publishHud();
+                continue;
+            }
+            Optional<Command> cmd = registry.find(parsed.verb());
+            if (cmd.isEmpty()) {
+                ctx.getIo().write("I don't understand '" + parsed.verb() + "'. Type 'help'.");
+            } else {
+                cmd.get().execute(ctx, parsed.args());
+                ctx.getSession().incrementTurn();
+                if (ctx.getSession().getTurn() % 10 == 0) {
+                    ctx.save();
+                }
+                if (tutorialGuide != null) {
+                    tutorialGuide.onCommand(ctx, parsed);
+                }
+            }
+            publishHud();
+            maybeEnd();
+```
+
+- [ ] **Step 4: Wire `App`**
+
+In `src/main/java/thb/jeanluc/adventure/App.java`:
+
+1. Add imports:
+```java
+import thb.jeanluc.adventure.game.TutorialGuide;
+import thb.jeanluc.adventure.loader.TutorialLoader;
+import thb.jeanluc.adventure.model.Tutorial;
+```
+
+2. Change the two `play(...)` call sites in `run()`:
+```java
+                case NEW_GAME -> play(io, saves, newSession(io), true);
+```
+and inside the LOAD branch:
+```java
+                            play(io, saves, saves.load(slot.slug()), false);
+```
+
+3. Change the `play` signature and add the guide wiring (after the `HelpCommand` is registered, before the banner):
+```java
+    private static void play(GameIO io, SaveService saves, GameSession session, boolean withTutorial) {
+```
+and, immediately after `registry.register(new HelpCommand(registry), "help", "?");`:
+```java
+        if (withTutorial) {
+            Tutorial tutorial = new TutorialLoader().load();
+            if (!tutorial.isEmpty()) {
+                game.setTutorialGuide(new TutorialGuide(tutorial, registry));
+            }
+        }
+```
+
+- [ ] **Step 5: Run tests + full suite**
+
+Run: `mvn -q test -Dtest=GameTutorialTest`
+Expected: PASS.
+Run: `mvn -q clean test`
+Expected: BUILD SUCCESS, all green (existing GameTest / loop tests unaffected — guide is null there).
+
+- [ ] **Step 6: Manual console smoke (optional)**
+
+Run: `mvn -q -DskipTests compile dependency:build-classpath -Dmdep.outputFile=/tmp/cp.txt >/dev/null 2>&1` then
+`printf '1\nHero\nlook\nskip\nquit\n4\n' | java -cp "target/classes:$(cat /tmp/cp.txt)" thb.jeanluc.adventure.App`
+Expected: New Game → name → room shown → tutorial intro + "look" instruction → after `look`, confirmation + next instruction → `skip` → "Tutorial skipped." → normal play → `quit` → menu → Quit.
+
+- [ ] **Step 7: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/game/Game.java \
+        src/main/java/thb/jeanluc/adventure/App.java \
+        src/test/java/thb/jeanluc/adventure/game/GameTutorialTest.java
+git commit -m "feat: wire TutorialGuide into the game loop; show on New Game only"
+```
+
+---
+
+## Task 4: Docs
+
+**Files:**
+- Modify: `docs/enhancement-ideas.md`
+
+- [ ] **Step 1: Add a tutorial note**
+
+In `docs/enhancement-ideas.md`, under the "Festgelegte Erweiterungs-Entscheidungen"
+area (near the pathfinding ✅ note), add:
+
+> ✅ **Tutorial** umgesetzt (Branch `feature/tutorial`): interaktiver Walkthrough
+> beim Neuen Spiel (look→examine→take→inventory→use→go→go to), verb-/alias-basierte
+> Abschluss-Erkennung (Bewegungs-Schritte verlangen echten Raumwechsel), Abschluss-
+> Tipps, jederzeit per `skip` abbrechbar. Datengetrieben (`tutorial.yaml`,
+> `TutorialLoader`), als `TutorialGuide` in den Game-Loop eingehängt; nur bei Neuem
+> Spiel, nicht beim Laden.
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add docs/enhancement-ideas.md
+git commit -m "docs: note interactive start-of-game tutorial"
+```
+
+---
+
+## Final Verification
+
+- [ ] `mvn -q clean test` — all tests pass (197 prior + TutorialLoader/TutorialGuide/GameTutorial suites).
+- [ ] Manual console smoke (Task 3 Step 6) behaves as described.
+- [ ] Manual: Load a saved game → NO tutorial appears.
+- [ ] `git status` clean.
+```

Semesterprojekt/docs/superpowers/plans/2026-06-01-use-x-on-y.md

@@ -0,0 +1,957 @@
+# `use X on Y` Item Combinations Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add a data-driven `use X on Y` item-combination mechanic: recipes that optionally require conditions, consume items, produce an item, apply effects, and print a response — operands resolved from inventory or the current room.
+
+**Architecture:** A new `Combination` domain record + optional `combinations.yaml` loaded like quests/endings into `World.combinations` (a `Map` keyed by an order-independent pair key). A stateless `Combinations` engine (alongside `Conditions`/`Effects`/`Light`) performs resolution, lookup, and application. `UseCommand` routes 2+ args to the engine; 1 arg keeps the existing single-item behaviour. No parser change — `on`/`with`/`to` are already filler words.
+
+**Tech Stack:** Java 25, Maven, Jackson (YAML loader), JUnit 5 + AssertJ, Lombok.
+
+---
+
+## File Structure
+
+**Create:**
+- `src/main/java/thb/jeanluc/adventure/model/Combination.java` — domain record + canonical pair key.
+- `src/main/java/thb/jeanluc/adventure/loader/dto/CombinationDto.java` — YAML DTO.
+- `src/main/java/thb/jeanluc/adventure/loader/CombinationFactory.java` — DTO → domain, validates item ids exist.
+- `src/main/java/thb/jeanluc/adventure/game/Combinations.java` — combination engine.
+- `src/main/resources/world/combinations.yaml` — demo recipe.
+
+**Modify:**
+- `model/World.java` — add `combinations` field + backward-compatible constructors + getter.
+- `loader/WorldLoader.java` — read `combinations.yaml`, build the map (dup-key check), pass to `World`.
+- `command/impl/UseCommand.java` — route 2+ args to `Combinations.tryUse`.
+- `src/main/resources/world/items.yaml` — add `matches`, `torch`, `lit_torch`.
+- `src/main/resources/world/rooms.yaml` — place `matches` (library) and `torch` (hallway).
+
+---
+
+## Task 1: `Combination` domain model + canonical key
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/model/Combination.java`
+- Test: `src/test/java/thb/jeanluc/adventure/model/CombinationTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/model/CombinationTest.java`:
+```java
+package thb.jeanluc.adventure.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationTest {
+
+    @Test
+    void keyIsOrderIndependentAndSorted() {
+        assertThat(Combination.key("matches", "torch"))
+                .isEqualTo(Combination.key("torch", "matches"))
+                .isEqualTo("matches|torch");
+        assertThat(Combination.key("b", "a")).isEqualTo("a|b");
+    }
+
+    @Test
+    void nullCollectionComponentsBecomeEmpty() {
+        Combination c = new Combination("a", "b", null, null, null, null, "ok", null);
+        assertThat(c.requires()).isEmpty();
+        assertThat(c.consume()).isEmpty();
+        assertThat(c.effects()).isEmpty();
+        assertThat(c.produce()).isNull();
+        assertThat(c.key()).isEqualTo("a|b");
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=CombinationTest`
+Expected: FAIL — `Combination` does not exist.
+
+- [ ] **Step 3: Create `Combination`**
+
+`src/main/java/thb/jeanluc/adventure/model/Combination.java`:
+```java
+package thb.jeanluc.adventure.model;
+
+import java.util.List;
+
+/**
+ * A data-driven item-combination recipe. Identified by an unordered pair of
+ * item ids ({@code a}, {@code b}). When applied it may require conditions,
+ * consume items, produce an item, apply effects, and print a response.
+ */
+public record Combination(
+        String a,
+        String b,
+        List<Condition> requires,
+        List<String> consume,
+        String produce,
+        List<Effect> effects,
+        String response,
+        String failText
+) {
+    public Combination {
+        requires = requires == null ? List.of() : List.copyOf(requires);
+        consume = consume == null ? List.of() : List.copyOf(consume);
+        effects = effects == null ? List.of() : List.copyOf(effects);
+    }
+
+    /** Order-independent key for an item pair (sorted, '|'-joined). */
+    public static String key(String x, String y) {
+        return x.compareTo(y) <= 0 ? x + "|" + y : y + "|" + x;
+    }
+
+    /** This recipe's canonical pair key. */
+    public String key() {
+        return key(a, b);
+    }
+}
+```
+
+- [ ] **Step 4: Run test to verify it passes**
+
+Run: `mvn -q test -Dtest=CombinationTest`
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/model/Combination.java \
+        src/test/java/thb/jeanluc/adventure/model/CombinationTest.java
+git commit -m "feat(model): Combination recipe record + order-independent key"
+```
+
+---
+
+## Task 2: `World.combinations` field + constructors
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/model/World.java`
+- Test: `src/test/java/thb/jeanluc/adventure/model/WorldCombinationsTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/model/WorldCombinationsTest.java`:
+```java
+package thb.jeanluc.adventure.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class WorldCombinationsTest {
+
+    @Test
+    void legacyConstructorsDefaultToEmptyCombinations() {
+        World w5 = new World(Map.of(), Map.of(), Map.of(), "t", "w");
+        World w6 = new World(Map.of(), Map.of(), Map.of(), "t", "w", Map.of());
+        World w7 = new World(Map.of(), Map.of(), Map.of(), "t", "w", Map.of(), List.of());
+        assertThat(w5.getCombinations()).isEmpty();
+        assertThat(w6.getCombinations()).isEmpty();
+        assertThat(w7.getCombinations()).isEmpty();
+    }
+
+    @Test
+    void fullConstructorStoresCombinations() {
+        Combination c = new Combination("a", "b", List.of(), List.of(), null, List.of(), "r", null);
+        World w = new World(Map.of(), Map.of(), Map.of(), "t", "w",
+                Map.of(), List.of(), Map.of(c.key(), c));
+        assertThat(w.getCombinations()).containsKey("a|b");
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=WorldCombinationsTest`
+Expected: FAIL — no `getCombinations()` / no 8-arg constructor.
+
+- [ ] **Step 3: Add the field, constructors, and import**
+
+In `src/main/java/thb/jeanluc/adventure/model/World.java`:
+
+Add the import near the other model imports:
+```java
+import thb.jeanluc.adventure.model.Combination;
+```
+(If the file is in package `thb.jeanluc.adventure.model`, `Combination` is same-package — skip the import; reference it directly.)
+
+Add the field immediately after the `endings` field:
+```java
+    /** Global lookup of combination recipes by canonical pair key. */
+    private final Map<String, Combination> combinations;
+```
+
+Update the existing 5-arg and 6-arg convenience constructors and add a 7-arg one, so all delegate to the Lombok-generated 8-arg constructor:
+```java
+    /** Backward-compatible constructor for worlds without quests, endings, or combinations. */
+    public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
+                 String title, String welcomeMessage) {
+        this(rooms, items, npcs, title, welcomeMessage, Map.of(), List.of(), Map.of());
+    }
+
+    /** Backward-compatible constructor for worlds with quests but no endings/combinations. */
+    public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
+                 String title, String welcomeMessage, Map<String, Quest> quests) {
+        this(rooms, items, npcs, title, welcomeMessage, quests, List.of(), Map.of());
+    }
+
+    /** Backward-compatible constructor for worlds with quests + endings but no combinations. */
+    public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
+                 String title, String welcomeMessage, Map<String, Quest> quests, List<Ending> endings) {
+        this(rooms, items, npcs, title, welcomeMessage, quests, endings, Map.of());
+    }
+```
+(The `@RequiredArgsConstructor` now generates the canonical 8-arg constructor `(rooms, items, npcs, title, welcomeMessage, quests, endings, combinations)`, and `@Getter` provides `getCombinations()`.)
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=WorldCombinationsTest,QuestEngineTest`
+Expected: PASS (QuestEngineTest uses the 6-arg constructor — still compiles).
+
+- [ ] **Step 5: Full compile check (all World callers still build)**
+
+Run: `mvn -q -DskipTests test-compile`
+Expected: BUILD SUCCESS (5/6/7-arg call sites in tests + WorldLoader still resolve).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/model/World.java \
+        src/test/java/thb/jeanluc/adventure/model/WorldCombinationsTest.java
+git commit -m "feat(model): World.combinations field + backward-compatible constructors"
+```
+
+---
+
+## Task 3: `CombinationDto` + `CombinationFactory` (with id validation)
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/loader/dto/CombinationDto.java`
+- Create: `src/main/java/thb/jeanluc/adventure/loader/CombinationFactory.java`
+- Test: `src/test/java/thb/jeanluc/adventure/loader/CombinationFactoryTest.java`
+
+Validation lives in the factory (build-time, with the item map at hand) rather than `WorldValidator`, to avoid changing `WorldValidator`'s constructor (used directly by `WorldValidatorTest`).
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/loader/CombinationFactoryTest.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class CombinationFactoryTest {
+
+    private Map<String, Item> items() {
+        Map<String, Item> m = new HashMap<>();
+        for (String id : List.of("matches", "torch", "lit_torch")) {
+            m.put(id, PlainItem.builder().id(id).name(id).description("d").light(false).build());
+        }
+        return m;
+    }
+
+    @Test
+    void buildsCombinationFromDto() {
+        CombinationDto dto = new CombinationDto("matches", "torch", null,
+                List.of("matches", "torch"), "lit_torch", null, "You light it.", null);
+        Combination c = CombinationFactory.fromDto(dto, items());
+        assertThat(c.key()).isEqualTo("matches|torch");
+        assertThat(c.consume()).containsExactly("matches", "torch");
+        assertThat(c.produce()).isEqualTo("lit_torch");
+        assertThat(c.response()).isEqualTo("You light it.");
+    }
+
+    @Test
+    void rejectsUnknownOperandId() {
+        CombinationDto dto = new CombinationDto("matches", "ghost", null, null, null, null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("ghost");
+    }
+
+    @Test
+    void rejectsUnknownProduceId() {
+        CombinationDto dto = new CombinationDto("matches", "torch", null, null, "phantom", null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("phantom");
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=CombinationFactoryTest`
+Expected: FAIL — `CombinationDto` / `CombinationFactory` do not exist.
+
+- [ ] **Step 3: Create `CombinationDto`**
+
+`src/main/java/thb/jeanluc/adventure/loader/dto/CombinationDto.java`:
+```java
+package thb.jeanluc.adventure.loader.dto;
+
+import java.util.List;
+
+/** YAML representation of an item-combination recipe. */
+public record CombinationDto(
+        String a,
+        String b,
+        List<ConditionDto> requires,
+        List<String> consume,
+        String produce,
+        List<EffectDto> effects,
+        String response,
+        String failText
+) {
+}
+```
+
+- [ ] **Step 4: Create `CombinationFactory`**
+
+`src/main/java/thb/jeanluc/adventure/loader/CombinationFactory.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
+import thb.jeanluc.adventure.loader.dto.ConditionDto;
+import thb.jeanluc.adventure.loader.dto.EffectDto;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+
+import java.util.List;
+import java.util.Map;
+
+/** Builds {@link Combination}s from {@link CombinationDto}s, validating item ids. */
+public final class CombinationFactory {
+
+    private CombinationFactory() {
+    }
+
+    public static Combination fromDto(CombinationDto dto, Map<String, Item> items) {
+        requireItem(items, dto.a(), "a");
+        requireItem(items, dto.b(), "b");
+        if (dto.consume() != null) {
+            for (String id : dto.consume()) {
+                requireItem(items, id, "consume");
+            }
+        }
+        if (dto.produce() != null) {
+            requireItem(items, dto.produce(), "produce");
+        }
+        return new Combination(
+                dto.a(),
+                dto.b(),
+                ConditionDto.toModelList(dto.requires()),
+                dto.consume() == null ? List.of() : List.copyOf(dto.consume()),
+                dto.produce(),
+                EffectDto.toModelList(dto.effects()),
+                dto.response(),
+                dto.failText());
+    }
+
+    private static void requireItem(Map<String, Item> items, String id, String field) {
+        if (id == null) {
+            throw new WorldLoadException("Combination '" + field + "' is missing an item id");
+        }
+        if (!items.containsKey(id)) {
+            throw new WorldLoadException(
+                    "Combination references unknown item '" + id + "' (field '" + field + "')");
+        }
+    }
+}
+```
+
+- [ ] **Step 5: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=CombinationFactoryTest`
+Expected: PASS (3 tests).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/loader/dto/CombinationDto.java \
+        src/main/java/thb/jeanluc/adventure/loader/CombinationFactory.java \
+        src/test/java/thb/jeanluc/adventure/loader/CombinationFactoryTest.java
+git commit -m "feat(loader): CombinationDto + CombinationFactory with id validation"
+```
+
+---
+
+## Task 4: `Combinations` engine
+
+**Files:**
+- Create: `src/main/java/thb/jeanluc/adventure/game/Combinations.java`
+- Test: `src/test/java/thb/jeanluc/adventure/game/CombinationsTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/game/CombinationsTest.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Effect;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationsTest {
+
+    private Item plain(String id, boolean light) {
+        return PlainItem.builder().id(id).name(id).description("d").light(light).build();
+    }
+
+    /** World with matches/torch/lit_torch/shovel and the given recipes; player in an empty room. */
+    private GameContext ctx(Combination... recipes) {
+        Map<String, Item> items = new LinkedHashMap<>();
+        items.put("matches", plain("matches", false));
+        items.put("torch", plain("torch", false));
+        items.put("lit_torch", plain("lit_torch", true));
+        items.put("shovel", plain("shovel", false));
+        Map<String, Combination> combos = new HashMap<>();
+        for (Combination c : recipes) {
+            combos.put(c.key(), c);
+        }
+        Room start = new Room("start", "Start", "d");
+        World w = new World(Map.of("start", start), items, Map.of(), "t", "w",
+                Map.of(), List.of(), combos);
+        return new GameContext(w, new Player(start, 0), new TestIO());
+    }
+
+    private void give(GameContext ctx, String id) {
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get(id));
+    }
+
+    private void putInRoom(GameContext ctx, String id) {
+        ctx.getPlayer().getCurrentRoom().addItem(ctx.getWorld().getItems().get(id));
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    private Combination torchRecipe() {
+        return new Combination("matches", "torch", List.of(),
+                List.of("matches", "torch"), "lit_torch", List.of(),
+                "You light the torch.", null);
+    }
+
+    @Test
+    void combinesFromInventory() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getPlayer().hasItem("matches")).isFalse();
+        assertThat(ctx.getPlayer().hasItem("torch")).isFalse();
+        assertThat(out(ctx)).contains("light the torch");
+    }
+
+    @Test
+    void matchIsOrderIndependent() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "torch", "matches");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+    }
+
+    @Test
+    void consumesOperandFromCurrentRoom() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        putInRoom(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getPlayer().getCurrentRoom().findItem("torch")).isEmpty();
+    }
+
+    @Test
+    void missingOperandReportsNoSuch() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches"); // torch absent
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(out(ctx)).contains("no 'torch'");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isFalse();
+    }
+
+    @Test
+    void noRecipeForPairSaysNothingHappens() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "shovel");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "shovel", "torch");
+        assertThat(out(ctx)).contains("Nothing happens.");
+    }
+
+    @Test
+    void unmetRequiresShowsFailTextAndDoesNotProduce() {
+        Combination gated = new Combination("matches", "torch",
+                List.of(new Condition(Condition.Type.FLAG, "dry")),
+                List.of("matches", "torch"), "lit_torch", List.of(),
+                "It catches.", "The torch is too damp to light.");
+        GameContext ctx = ctx(gated);
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(out(ctx)).contains("too damp");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isFalse();
+        assertThat(ctx.getPlayer().hasItem("matches")).isTrue(); // not consumed
+    }
+
+    @Test
+    void metRequiresAppliesEffectsAndProduces() {
+        Combination gated = new Combination("matches", "torch",
+                List.of(new Condition(Condition.Type.FLAG, "dry")),
+                List.of("matches", "torch"), "lit_torch",
+                List.of(new Effect(Effect.Type.SET_FLAG, "torch_lit")),
+                "It catches.", "too damp");
+        GameContext ctx = ctx(gated);
+        ctx.getState().set("dry");
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getState().isSet("torch_lit")).isTrue();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=CombinationsTest`
+Expected: FAIL — `Combinations` does not exist.
+
+- [ ] **Step 3: Create `Combinations`**
+
+`src/main/java/thb/jeanluc/adventure/game/Combinations.java`:
+```java
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+
+/**
+ * Applies {@code use X on Y} item combinations. Stateless utility, mirroring
+ * {@link Conditions}/{@link Effects}/{@link Light}. Operands resolve from the
+ * player's inventory or the current room.
+ */
+public final class Combinations {
+
+    private Combinations() {
+    }
+
+    /**
+     * Attempts to combine the two named items. Prints a resolution error if an
+     * operand is absent, the recipe's {@code failText} (or a generic line) if a
+     * recipe's requirements are unmet, "Nothing happens." if there is no recipe,
+     * or applies consume/produce/effects + the response on success.
+     */
+    public static void tryUse(GameContext ctx, String idX, String idY) {
+        if (!present(ctx, idX)) {
+            ctx.getIo().write(noSuch(idX));
+            return;
+        }
+        if (!present(ctx, idY)) {
+            ctx.getIo().write(noSuch(idY));
+            return;
+        }
+        Combination c = ctx.getWorld().getCombinations().get(Combination.key(idX, idY));
+        if (c == null) {
+            ctx.getIo().write("Nothing happens.");
+            return;
+        }
+        if (!Conditions.all(c.requires(), ctx)) {
+            ctx.getIo().write(c.failText() != null ? c.failText() : "Nothing happens.");
+            return;
+        }
+        for (String id : c.consume()) {
+            removeFromAnywhere(ctx, id);
+        }
+        if (c.produce() != null) {
+            Item produced = ctx.getWorld().getItems().get(c.produce());
+            if (produced != null) {
+                ctx.getPlayer().addItem(produced);
+            }
+        }
+        Effects.applyAll(c.effects(), ctx);
+        ctx.getIo().write(c.response());
+    }
+
+    private static boolean present(GameContext ctx, String id) {
+        return ctx.getPlayer().hasItem(id)
+                || ctx.getPlayer().getCurrentRoom().findItem(id).isPresent();
+    }
+
+    private static void removeFromAnywhere(GameContext ctx, String id) {
+        if (ctx.getPlayer().removeItem(id).isEmpty()) {
+            ctx.getPlayer().getCurrentRoom().removeItem(id);
+        }
+    }
+
+    private static String noSuch(String id) {
+        return "There is no '" + id + "' here or in your inventory.";
+    }
+}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=CombinationsTest`
+Expected: PASS (7 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/game/Combinations.java \
+        src/test/java/thb/jeanluc/adventure/game/CombinationsTest.java
+git commit -m "feat(game): Combinations engine for use X on Y"
+```
+
+---
+
+## Task 5: Route `UseCommand` to combinations
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/command/impl/UseCommand.java`
+- Test: `src/test/java/thb/jeanluc/adventure/command/impl/UseCommandComboTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/command/impl/UseCommandComboTest.java`:
+```java
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+import thb.jeanluc.adventure.model.item.SwitchableItem;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class UseCommandComboTest {
+
+    private GameContext ctx() {
+        Map<String, Item> items = new LinkedHashMap<>();
+        items.put("matches", PlainItem.builder().id("matches").name("Matches").description("d").light(false).build());
+        items.put("torch", PlainItem.builder().id("torch").name("Torch").description("d").light(false).build());
+        items.put("lit_torch", PlainItem.builder().id("lit_torch").name("Lit Torch").description("d").light(true).build());
+        SwitchableItem lamp = SwitchableItem.builder()
+                .id("lamp").name("Lamp").description("d").light(true)
+                .onText("The lamp glows.").offText("off").state(false).effects(List.of()).build();
+        items.put("lamp", lamp);
+        Combination recipe = new Combination("matches", "torch", List.of(),
+                List.of("matches", "torch"), "lit_torch", List.of(), "You light the torch.", null);
+        Room start = new Room("start", "Start", "d");
+        World w = new World(Map.of("start", start), items, Map.of(), "t", "w",
+                Map.of(), List.of(), Map.of(recipe.key(), recipe));
+        GameContext ctx = new GameContext(w, new Player(start, 0), new TestIO());
+        ctx.getPlayer().addItem(items.get("matches"));
+        ctx.getPlayer().addItem(items.get("torch"));
+        ctx.getPlayer().addItem(lamp);
+        return ctx;
+    }
+
+    @Test
+    void emptyArgsAsksWhat() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of());
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("Use what?");
+    }
+
+    @Test
+    void twoArgsRoutesToCombination() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of("matches", "torch"));
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("light the torch");
+    }
+
+    @Test
+    void oneArgUsesItemDirectly() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of("lamp"));
+        assertThat(((SwitchableItem) ctx.getWorld().getItems().get("lamp")).isOn()).isTrue();
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("lamp glows");
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=UseCommandComboTest`
+Expected: FAIL — `twoArgsRoutesToCombination` fails (current `UseCommand` treats only the first arg, no combination).
+
+- [ ] **Step 3: Add the combination branch to `UseCommand`**
+
+In `src/main/java/thb/jeanluc/adventure/command/impl/UseCommand.java`:
+
+Add the import:
+```java
+import thb.jeanluc.adventure.game.Combinations;
+```
+
+Insert the two-arg branch in `execute`, right after the empty-args check and before `String itemId = args.getFirst();`:
+```java
+        if (args.size() >= 2) {
+            Combinations.tryUse(ctx, args.get(0), args.get(1));
+            return;
+        }
+```
+
+Also update the `help()` text:
+```java
+    @Override
+    public String help() {
+        return "use <item>  -  use an item; or  use <item> on <item>  to combine them";
+    }
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=UseCommandComboTest`
+Expected: PASS (3 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/command/impl/UseCommand.java \
+        src/test/java/thb/jeanluc/adventure/command/impl/UseCommandComboTest.java
+git commit -m "feat(command): route use X on Y to the combination engine"
+```
+
+---
+
+## Task 6: Loader wiring + demo content
+
+**Files:**
+- Modify: `src/main/java/thb/jeanluc/adventure/loader/WorldLoader.java`
+- Modify: `src/main/resources/world/items.yaml`
+- Modify: `src/main/resources/world/rooms.yaml`
+- Create: `src/main/resources/world/combinations.yaml`
+- Test: `src/test/java/thb/jeanluc/adventure/loader/CombinationLoadingTest.java`
+
+- [ ] **Step 1: Write the failing test**
+
+`src/test/java/thb/jeanluc/adventure/loader/CombinationLoadingTest.java`:
+```java
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.Combinations;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.GameSession;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationLoadingTest {
+
+    @Test
+    void realWorldLoadsTheTorchRecipe() {
+        WorldLoader.LoadResult loaded = new WorldLoader().load();
+        assertThat(loaded.world().getCombinations())
+                .containsKey(Combination.key("matches", "torch"));
+        assertThat(loaded.world().getItems()).containsKeys("matches", "torch", "lit_torch");
+    }
+
+    @Test
+    void torchRecipeWorksEndToEnd() {
+        WorldLoader.LoadResult loaded = new WorldLoader().load();
+        GameContext ctx = new GameContext(
+                new GameSession(loaded.world(), loaded.player(), "test"), new TestIO());
+        // grab the demo items straight from the registry, regardless of room
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get("matches"));
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get("torch"));
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+    }
+}
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+Run: `mvn -q test -Dtest=CombinationLoadingTest`
+Expected: FAIL — no `combinations.yaml`/`matches` items yet; `getCombinations()` is empty.
+
+- [ ] **Step 3: Wire `WorldLoader`**
+
+In `src/main/java/thb/jeanluc/adventure/loader/WorldLoader.java`:
+
+Add imports:
+```java
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
+import thb.jeanluc.adventure.model.Combination;
+```
+
+In `load()`, add the read alongside the other optional reads (after the `endingDtos` line):
+```java
+        List<CombinationDto> combinationDtos =
+                readListOptional(basePath + "/combinations.yaml", CombinationDto.class);
+```
+
+After the `endings` list is built (and after `items` is populated), build the combinations map:
+```java
+        Map<String, Combination> combinations = new HashMap<>();
+        for (CombinationDto dto : combinationDtos) {
+            Combination c = CombinationFactory.fromDto(dto, items);
+            String key = c.key();
+            if (combinations.containsKey(key)) {
+                throw new WorldLoadException("Duplicate combination for pair '" + key + "'");
+            }
+            combinations.put(key, c);
+        }
+```
+
+Change the `World` construction to the 8-arg form:
+```java
+        World world = new World(rooms, items, npcs,
+                gameDto.title(), gameDto.welcomeMessage(), quests, endings, combinations);
+```
+
+- [ ] **Step 4: Add demo items to `items.yaml`**
+
+Append to `src/main/resources/world/items.yaml`:
+```yaml
+
+- type: plain
+  id: matches
+  name: Box of Matches
+  description: A small box of dry matches. They rattle when you shake it.
+
+- type: plain
+  id: torch
+  name: Unlit Torch
+  description: A pitch-soaked torch, waiting for a flame.
+
+- type: plain
+  id: lit_torch
+  name: Lit Torch
+  description: A burning torch, throwing back the dark.
+  light: true
+```
+
+- [ ] **Step 5: Place demo items in rooms**
+
+In `src/main/resources/world/rooms.yaml`:
+- Change the `library` room's items line from `items: [shovel]` to:
+```yaml
+  items: [shovel, matches]
+```
+- Change the `hallway` room's items line from `items: []` to:
+```yaml
+  items: [torch]
+```
+
+- [ ] **Step 6: Create `combinations.yaml`**
+
+`src/main/resources/world/combinations.yaml`:
+```yaml
+- a: matches
+  b: torch
+  consume: [matches, torch]
+  produce: lit_torch
+  response: |
+    You strike a match and touch it to the torch; it catches with a low hiss
+    and burns steady. You now hold a lit torch.
+```
+
+- [ ] **Step 7: Run tests to verify they pass**
+
+Run: `mvn -q test -Dtest=CombinationLoadingTest`
+Expected: PASS (2 tests).
+
+- [ ] **Step 8: Full suite (no regressions from new items)**
+
+Run: `mvn -q clean test`
+Expected: BUILD SUCCESS, all tests green. (WorldLoaderTest uses its own test fixture base, not these production resources, so it is unaffected.)
+
+- [ ] **Step 9: Commit**
+
+```bash
+git add src/main/java/thb/jeanluc/adventure/loader/WorldLoader.java \
+        src/main/resources/world/items.yaml \
+        src/main/resources/world/rooms.yaml \
+        src/main/resources/world/combinations.yaml \
+        src/test/java/thb/jeanluc/adventure/loader/CombinationLoadingTest.java
+git commit -m "feat(loader): load combinations.yaml; demo matches+torch -> lit_torch"
+```
+
+---
+
+## Task 7: Docs
+
+**Files:**
+- Modify: `docs/enhancement-ideas.md`
+
+- [ ] **Step 1: Mark the combination mechanic implemented**
+
+In `docs/enhancement-ideas.md`, under section **5b** (Mechanik-Spine), add a `> ✅`
+blockquote note after the bullet for mechanic **4. Item-Kombination**, mirroring
+the existing `> ✅ umgesetzt (Branch ...)` style used for light/darkness etc.:
+
+> ✅ umgesetzt (Branch `feature/use-x-on-y`): `use X on Y` als datengetriebene
+> Rezepte (`combinations.yaml`: requires/consume/produce/effects/response/failText),
+> Operanden aus Inventar oder Raum, reihenfolge-unabhängig. Kein Parser-Eingriff
+> (`on`/`with`/`to` sind bereits Filler). Demo: `matches` + `torch` → `lit_torch`
+> (dauerhafte Lichtquelle).
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add docs/enhancement-ideas.md
+git commit -m "docs: mark use X on Y item combination implemented"
+```
+
+---
+
+## Final Verification
+
+- [ ] `mvn -q clean test` — all tests pass (162 prior + the new combination suites).
+- [ ] Manual console smoke (optional): start a game, navigate to the hallway (`take torch`) and library (`take matches`), then `use matches on torch` → "You ... lit torch"; `inventory` shows `lit_torch`, `matches`/`torch` gone.
+- [ ] `git status` clean.

Semesterprojekt/docs/superpowers/specs/2026-06-01-music-design.md

@@ -0,0 +1,226 @@
+# Spec: Hintergrundmusik (GUI)
+
+Stand: 2026-06-01. Letzte der geplanten Mechaniken (nach `use X on Y`,
+Pathfinding, Tutorial). Setzt Backlog #8 um: **Hintergrundmusik nur in der GUI**,
+pro Raum via YAML, externer `music/`-Ordner, gestreamtes OGG. Baut auf der
+`GameIO`-Abstraktion, dem Per-Zug-Push (`Game.publishHud`), dem datengetriebenen
+Loader und der minimalen Settings auf.
+
+## 1. Kontext & Ziel
+
+Bisher gibt es keinen Ton. Ziel: **Hintergrundmusik in der GUI**, pro Raum über
+ein optionales `music:`-Feld in `rooms.yaml`. Beim Raumwechsel sanfter Übergang;
+Lautstärke/Aus über die Settings. Konsole bleibt stumm (No-Op).
+
+Bestätigte Entscheidungen (Brainstorming 2026-06-01):
+- **Format/Lib**: **OGG Vorbis** via `vorbisspi` + `jorbis` (javax.sound-SPI),
+  gestreamt über eine `SourceDataLine`.
+- **Wechsel**: gleicher Track → unverändert weiter (kein Neustart); anderer Track →
+  **kurzes Fade-out, dann Fade-in** (~400 ms, sequenziell, eine Line);
+  Raum **ohne** `music` → **Fade to silence**.
+- **Settings**: eine zyklische **Music**-Stufe `OFF/LOW/MEDIUM/HIGH`, persistiert;
+  `OFF` deaktiviert Wiedergabe. Default **MEDIUM**.
+- **Dateien**: externer `music/`-Ordner (Arbeitsverzeichnis), **gitignored**, nicht
+  im JAR; fehlende Datei → still + Log, kein Absturz.
+- **Demo**: einige Räume mit Beispiel-`music:`-Feldern + Doku zum `music/`-Ordner.
+
+## 2. Scope
+
+**In Scope:**
+- `MusicLevel`-Enum (OFF/LOW/MEDIUM/HIGH + `gainDb()`).
+- `MusicController` (frontend-agnostisch, **testbar**): Track-/Level-Logik,
+  delegiert an ein `MusicBackend`.
+- `MusicBackend`-Interface (Roh-Operationen) + `OggMusicBackend` (Audio, **manuell**).
+- `GameIO.setMusic(String)` + `setMusicLevel(MusicLevel)` (Default No-Op);
+  `SwingIO`-Override mit `MusicController(new OggMusicBackend())`.
+- `Game.publishHud` ruft `setMusic(currentRoom.getMusic())`; nach `game.run()`
+  zurück ins Menü → `setMusic(null)`.
+- `Room.music` + `RoomDto.music` + `RoomFactory`; optionales `music:` in `rooms.yaml`.
+- `Settings.musicLevel` + `SettingsStore` (fehlt → MEDIUM); `SettingsMenu`-Zeile
+  „Music"; Anwendung via `io.setMusicLevel(...)` (Konsole No-Op).
+- `pom.xml`: `vorbisspi` + `jorbis`.
+- `music/` in `.gitignore` + kurze Doku.
+- Tests: `MusicController` (Fake-Backend), `MusicLevel`, Settings-Roundtrip,
+  Room-`music`-Laden.
+
+**Out of Scope:**
+- Konsolen-Audio (bleibt stumm).
+- True Cross-Fade (überlappende Lines) — nur sequenzielles Fade.
+- Sound-Effekte / mehrere gleichzeitige Tracks.
+- Mitliefern von Audiodateien im Repo.
+- Automatisierte Tests der echten OGG-Dekodierung/-Wiedergabe (manuell, GUI-only).
+
+## 3. `MusicLevel` (model oder io)
+
+```java
+public enum MusicLevel {
+    OFF, LOW, MEDIUM, HIGH;
+
+    /** MASTER_GAIN in dB; für OFF irrelevant (Wiedergabe deaktiviert). */
+    public float gainDb() {
+        return switch (this) {
+            case OFF -> Float.NEGATIVE_INFINITY;
+            case LOW -> -20f;
+            case MEDIUM -> -10f;
+            case HIGH -> 0f;
+        };
+    }
+    public boolean isOn() { return this != OFF; }
+
+    /** Nächste Stufe im Zyklus (für den Settings-Toggle). */
+    public MusicLevel next() {
+        return values()[(ordinal() + 1) % values().length];
+    }
+}
+```
+Platzierung: `io`-Paket (UI-nah, wie `ConsoleIO.ColorMode`). Settings referenziert es.
+
+## 4. `MusicBackend` + `MusicController` (io)
+
+```java
+/** Raw audio operations; the only part that touches sound hardware. */
+public interface MusicBackend {
+    void fadeTo(String track, float gainDb); // fade current out, start track (loop), fade in
+    void fadeOut();                          // fade current out + stop
+    void setGainDb(float gainDb);            // immediate volume change
+    void shutdown();                         // stop + release resources
+}
+```
+
+```java
+/** Frontend-agnostic music decision logic. Idempotent per track; honours level. */
+public final class MusicController {
+    private final MusicBackend backend;
+    private MusicLevel level = MusicLevel.MEDIUM;
+    private String current;   // currently selected track id, or null = silence
+
+    public MusicController(MusicBackend backend) { this.backend = backend; }
+
+    /** Called per turn with the current room's music field (may be null). */
+    public void room(String track) {
+        if (!level.isOn()) { return; }                 // OFF: stay silent, ignore
+        String t = (track == null || track.isBlank()) ? null : track;
+        if (java.util.Objects.equals(t, current)) { return; } // same → keep playing
+        current = t;
+        if (t == null) { backend.fadeOut(); } else { backend.fadeTo(t, level.gainDb()); }
+    }
+
+    /** Settings change. */
+    public void level(MusicLevel newLevel) {
+        this.level = newLevel;
+        if (!newLevel.isOn()) { backend.fadeOut(); current = null; }
+        else { backend.setGainDb(newLevel.gainDb()); }
+        // turning ON again starts on the next room() call (current was reset to null)
+    }
+
+    public void shutdown() { backend.shutdown(); }
+}
+```
+
+Hinweis: Bei Wechsel OFF→ON beginnt die Musik beim nächsten `room(...)` (pro Zug
+ohnehin aufgerufen), da `current` auf null gesetzt wurde. Das vermeidet, dass der
+Controller den aktuellen Raum kennen muss.
+
+## 5. `OggMusicBackend` (io, Audio, manuell)
+
+- Hält den aktuellen Wiedergabe-Thread (Daemon) + `SourceDataLine`.
+- `fadeTo(track, gainDb)`: laufenden Track per `MASTER_GAIN`-Rampe (~400 ms)
+  ausblenden, Thread stoppen (`volatile boolean stopping`), `music/<track>` öffnen
+  (`AudioSystem.getAudioInputStream` → vorbisspi liefert dekodiertes PCM), in einer
+  Schleife (Loop) in die Line schreiben, auf `gainDb` einblenden.
+- `fadeOut()`: Rampe runter, Thread stoppen, Line schließen.
+- `setGainDb(db)`: `MASTER_GAIN`-FloatControl sofort setzen.
+- `shutdown()`: stoppen + Ressourcen freigeben.
+- **Fehlende Datei / Decode-Fehler**: `log.warn`, still (kein Throw). `music/` fehlt
+  ganz → ebenso still.
+- Threading: Wiedergabe auf Daemon-Thread; Fades blockierend auf dem aufrufenden
+  Thread (Worker), kurz (~400 ms) — analog zur bestehenden `travelStep`-Pause.
+
+`music/<track>` = `Path.of("music", track)` relativ zum Arbeitsverzeichnis.
+
+## 6. `GameIO`-Anbindung
+
+```java
+/** Per-turn current-room track; null = silence. Console no-op; GUI plays. */
+default void setMusic(String track) { /* no-op */ }
+
+/** Apply the music volume/level. Console no-op; GUI sets it. */
+default void setMusicLevel(MusicLevel level) { /* no-op */ }
+```
+
+- `SwingIO`: Feld `MusicController music = new MusicController(new OggMusicBackend());`
+  `setMusic(t) → music.room(t)`; `setMusicLevel(l) → music.level(l)`.
+- `ConsoleIO`: erbt die No-Op-Defaults (kein Audio).
+- `Game.publishHud()`: zusätzlich `ctx.getIo().setMusic(ctx.getPlayer().getCurrentRoom().getMusic());`
+  (idempotent → Wechsel nur bei echtem Raumwechsel).
+- `App.play(...)`: nach `game.run()` → `io.setMusic(null);` (Musik beim Rückkehr ins
+  Menü ausblenden).
+
+## 7. Room-Feld + Loader
+
+- `Room`: optionales `private final String music;` (+ Getter). Konstruktor/Factory
+  erweitern; null = kein Track.
+- `RoomDto`: optionales `music`-Feld (nullable).
+- `RoomFactory.shellFromDto`: `music` durchreichen.
+- `rooms.yaml`: optionales `music: <datei>.ogg` pro Raum.
+- Demo: z.B. `kitchen: music: manor-theme.ogg`, `dungeon: music: dungeon-drone.ogg`
+  (Dateien liefert der Nutzer; fehlend → still).
+
+## 8. Settings-Erweiterung
+
+- `Settings` (record) bekommt `MusicLevel musicLevel`; `defaults()` → MEDIUM.
+- `SettingsStore`: Jackson serialisiert `MusicLevel` als Namen; alter Spielstand
+  ohne Feld → `null` → auf MEDIUM normalisieren (im `load()` oder via Defaults).
+- `SettingsMenu`: dritte Zeile „Music: <level>"; Auswahl zyklt `level.next()`;
+  nach jeder Änderung speichern + `applySettings`.
+- **Refactor**: `SettingsMenu.apply/show` nehmen statt `ConsoleIO` das `GameIO`
+  entgegen. `apply(Settings, GameIO io)`:
+  `io.setMusicLevel(s.musicLevel());` **und** `if (io instanceof ConsoleIO c) {
+  c.setColorMode(...); c.setGlyphMode(...); }`. Aufrufer (App, `MenuTest`) anpassen.
+- `App.run`: beim Start `SettingsMenu.apply(settings, io)` (setzt auch Music-Level).
+
+## 9. Abhängigkeit + Dateien
+
+- `pom.xml` (`<dependencies>`):
+  - `com.googlecode.soundlibs:vorbisspi:1.0.3.3`
+  - `com.googlecode.soundlibs:jorbis:0.0.17.4`
+  (vorbisspi zieht `tritonus-share` transitiv; bei Bedarf explizit ergänzen.)
+- `.gitignore`: `music/`.
+- Kurze Doku (z.B. in `docs/` oder README-Abschnitt): „Lege `.ogg`-Dateien in
+  `music/` ab; Räume referenzieren sie über `music:` in `rooms.yaml`. Ohne Dateien
+  bleibt die GUI stumm."
+
+## 10. Tests
+
+- **`MusicControllerTest`** (Fake-`MusicBackend`, das Aufrufe protokolliert):
+  - `room("a")` → `fadeTo("a", MEDIUM.gainDb())`; erneut `room("a")` → kein Aufruf.
+  - `room("b")` → `fadeTo("b", ...)`; `room(null)` → `fadeOut()`.
+  - `level(OFF)` → `fadeOut()` + danach ignoriert `room("a")` (still).
+  - `level(HIGH)` (von MEDIUM) → `setGainDb(HIGH)`; danach `room("a")` spielt.
+  - leerer/blank Track == null.
+- **`MusicLevelTest`**: `gainDb()`-Mapping; `next()`-Zyklus; `isOn()`.
+- **`SettingsStoreTest`** (erweitern): musicLevel round-trip; fehlendes Feld → MEDIUM.
+- **`SettingsMenu`/`MenuTest`** (anpassen an `GameIO`-Signatur): Music-Zeile zyklt
+  und persistiert.
+- **Room-`music`-Laden**: Loader-/Factory-Test, dass `music:` auf `Room.getMusic()`
+  landet (und Abwesenheit → null).
+- `OggMusicBackend` + echte Wiedergabe: **manuell** (eine `.ogg` + Audio-Hardware),
+  keine Unit-Tests (Konvention: kein GUI-/Hardware-abhängiger Test).
+
+## 11. Architektur-Werte / Risiken
+
+- **Geteilter Loop bleibt**: nur zwei neue `GameIO`-No-Op-Defaults; Musik-Logik im
+  testbaren `MusicController`, Audio isoliert im `OggMusicBackend`. Konsole stumm.
+- **Testbarkeit**: die wertvolle Entscheidungslogik (Idempotenz, null→Stille, OFF)
+  ist gegen ein Fake-Backend voll getestet; Hardware-Audio bleibt manuell.
+- **Datengetrieben**: `music:` pro Raum in YAML; keine Hardcodierung.
+- **Externe Dateien**: `music/` gitignored, nicht im JAR — Repo bleibt klein; fehlende
+  Dateien sind ein No-Op (graceful), kein Spielabbruch.
+- **Risiko Lib**: vorbisspi/jorbis sind alt, funktionieren aber mit `javax.sound`.
+  Falls eine Datei nicht dekodierbar ist → graceful silence. Lizenz: LGPL/BSD-artig,
+  für eine Erweiterung erlaubt (Backlog: Bibliotheken erlaubt).
+- **Threading**: Fades blockieren kurz den Worker-Thread (~400 ms, wie `travelStep`);
+  Wiedergabe auf Daemon-Thread. Beim Spielende `setMusic(null)` → Stille im Menü.
+- **Settings-Refactor**: `SettingsMenu` von `ConsoleIO` auf `GameIO` umstellen ist die
+  einzige Änderung an bestehendem, bereits reviewtem Code — minimal und nötig, damit
+  der Music-Level beide Frontends erreicht (Konsole No-Op).

Semesterprojekt/docs/superpowers/specs/2026-06-01-pathfinding-go-to-design.md

@@ -0,0 +1,194 @@
+# Spec: Pathfinding `go to <room>`
+
+Stand: 2026-06-01. Zweite der verbleibenden Mechaniken (nach `use X on Y`).
+Setzt den in `enhancement-ideas.md` als Algorithmus-Showcase notierten Punkt um:
+`go to <raum>` per BFS. Baut auf `GoCommand`, `MapLayout` (BFS-Gitter + Fog of
+War), `Light`, `Conditions`/`ExitLock` und der `GameIO`-Abstraktion auf.
+
+## 1. Kontext & Ziel
+
+Bewegung erfolgt bisher Schritt für Schritt per `go <richtung>`. Ziel: **`go to
+<raum>`** läuft automatisch per **BFS** über bereits **besuchte** Räume zum Ziel,
+unter Beachtung derselben Gates wie ein manueller Zug (verschlossene Exits, Licht).
+In der **GUI** soll die Minikarte die Bewegung **Raum für Raum animiert** zeigen;
+in der Konsole läuft die Reise still mit einer knappen Zusammenfassung.
+
+Bestätigte Entscheidungen (Brainstorming 2026-06-01):
+- **Erreichbarkeit**: nur **besuchte** Räume sind Wegpunkte/Ziele (Fog of War bleibt
+  erhalten; kein Teleport in Unentdecktes).
+- **Darstellung**: Konsole still + Zusammenfassung + Ziel-`look`; GUI animiert die
+  Minikarte (Map-Push pro Schritt).
+- **Zusammenfassung**: nennt **Start**, **Ziel** und **höchstens einen** mittleren
+  Wegpunkt (Mittelknoten). Bei 9 Knoten: 1., 5., 9.
+- **Schrittverzögerung GUI**: ~**300 ms** pro Raum.
+- **Trie-Autocomplete**: **zurückgestellt** (eigenes späteres Teilprojekt).
+
+## 2. Scope
+
+**In Scope:**
+- `GoCommand`-Erweiterung: Argument ist Richtung → bestehender Einzelzug; sonst →
+  Raum-Ziel-Pathfinding. Keine neue Verb-Registrierung (Parser entfernt `to`).
+- `Pathfinder` (`game`): BFS über besuchte Räume mit Passierbarkeits-Prädikat
+  (Exit-Lock + Licht), liefert den Pfad oder leer.
+- Auto-Walk: Schritt für Schritt `setCurrentRoom` + `GameIO.travelStep(MapView)`;
+  danach Zusammenfassung + `LookCommand`.
+- Neue `GameIO.travelStep(MapView)`-Default-Methode (No-Op Konsole) + `SwingIO`-
+  Override (Map-Push + ~300 ms Sleep).
+- Ziel-Auflösung nur unter besuchten Räumen (id, dann name; case-insensitive).
+- Zusammenfassung mit Start/Mitte/Ziel-Logik.
+- Tests: `Pathfinder` (BFS, Locks, Licht, besucht-nur, unerreichbar), `GoCommand`
+  (Raum-Ziel, Meldungen, Richtung weiterhin).
+
+**Out of Scope:**
+- Trie-/Tab-Autocomplete (eigenes Teilprojekt).
+- Routing durch **unbesuchte** Räume.
+- Pfad-Neuplanung mitten im Lauf (Zustand ändert sich während eines Zuges nicht).
+- Gewichtete Kanten / Kosten (alle Kanten gleich; BFS = kürzeste Raumzahl).
+- Mehr-Wort-Item-/Richtungs-Sonderfälle über die beschriebene Auflösung hinaus.
+
+## 3. Routing in `GoCommand`
+
+Der Parser entfernt `to`/`with`/… als Filler, daher liefern `go to library` und
+`go library` beide `args=[library]`. `execute` verzweigt:
+
+```java
+if (args.isEmpty()) { io.write("Go where? Try 'go north' or 'go to <room>'."); return; }
+String first = args.getFirst();
+try {
+    Direction dir = Direction.fromString(first);
+    moveDirection(ctx, dir);   // bestehender Einzelzug (unverändert ausgelagert)
+    return;
+} catch (IllegalArgumentException notADirection) {
+    goToRoom(ctx, args);       // neuer Raum-Ziel-Pfad
+}
+```
+
+`moveDirection` = der bisherige Rumpf (Exit prüfen, Lock, Licht, setCurrentRoom,
+look). `move`/`walk`-Aliase erben beides.
+
+## 4. Ziel-Auflösung (`goToRoom`)
+
+- Zielname = `String.join(" ", args).toLowerCase()` (`go to old kitchen` → "old kitchen").
+- Suche **nur unter besuchten Räumen** (`player.getVisitedRoomIds()` → `world.getRooms().get(id)`):
+  Treffer, wenn `id.equals(name)` **oder** `room.getName().toLowerCase().equals(name)`.
+- Kein Treffer → `"You don't know any direction or place called '<name>'."` (verrät keine
+  unentdeckten Räume).
+- Ziel == aktueller Raum → `"You're already in the <Name>."`
+- sonst → `Pathfinder.findPath`; leer → `"You can't find a way there right now."`;
+  sonst Auto-Walk (§6).
+
+## 5. `Pathfinder` (game/Pathfinder.java)
+
+```java
+/** Shortest path (BFS) over visited rooms to target, honouring locks + light.
+ *  Returns the steps AFTER the current room, ending at target; empty if none. */
+public static List<Room> findPath(GameContext ctx, Room target) { ... }
+```
+
+- BFS ab `player.getCurrentRoom()`; Queue + `Map<Room,Room> cameFrom`.
+- Kante `from --dir--> to` passierbar gdw.:
+  1. `to` ist in `player.getVisitedRoomIds()`,
+  2. Lock: `from.getExitLocks().get(dir)` ist null **oder** `Conditions.all(lock.requires(), ctx)`,
+  3. Licht: `Light.isLit(ctx, to)`.
+- Bei Erreichen von `target` Pfad via `cameFrom` rekonstruieren (ohne Startraum,
+  inkl. `target`). Unerreichbar → `List.of()`.
+- Rein über die Domäne + `ctx`; keine IO. Testbar wie `MapLayoutTest`/`QuestEngineTest`.
+
+Hinweis: Da nur besuchte Räume Kanten liefern und Start immer „besucht" ist, ist
+die Suche auf die bekannte Karte beschränkt. `target == current` behandelt
+`goToRoom` vorab (Pathfinder müsste sonst leeren Pfad liefern).
+
+## 6. Auto-Walk + animierte Minikarte
+
+```java
+List<Room> path = Pathfinder.findPath(ctx, target);
+if (path.isEmpty()) { io.write("You can't find a way there right now."); return; }
+for (Room step : path) {
+    ctx.getPlayer().setCurrentRoom(step);
+    ctx.getIo().travelStep(MapLayout.compute(
+            ctx.getWorld(), ctx.getPlayer().getVisitedRoomIds(), step));
+}
+ctx.getIo().write(summary(routeIncludingStart));   // §7
+new LookCommand().execute(ctx, List.of());
+```
+
+- `setCurrentRoom` markiert Räume als besucht (bereits besucht → idempotent).
+- `go to` ist **ein** Zug (ein Command) — der Game-Loop erhöht `turn` einmal.
+
+### `GameIO.travelStep(MapView)`
+
+```java
+/** Per-step travel frame during auto-walk. Console: no-op (silent). */
+default void travelStep(MapView view) {
+    // no animation in text mode
+}
+```
+
+`SwingIO`-Override:
+```java
+@Override
+public void travelStep(MapView view) {
+    setMap(view);                 // Map-Panel neu zeichnen (invokeLater)
+    try { Thread.sleep(TRAVEL_STEP_MS); }   // ~300 ms, läuft auf dem Worker-Thread
+    catch (InterruptedException e) { Thread.currentThread().interrupt(); }
+}
+```
+`TRAVEL_STEP_MS = 300`. Konsole bleibt still und ohne Pause (Default No-Op).
+Der reguläre `publishHud` am Zugende setzt den finalen Map-/HUD-Stand.
+
+## 7. Zusammenfassungs-Zeile (§ Wegpunkte)
+
+Über die volle Route `route = [current] + path` (n = `route.size()`, Index 0..n-1):
+- **Start** = `route[0]`, **Ziel** = `route[n-1]` immer genannt.
+- **Mitte** = `route[n/2]` nur wenn `n >= 3` und der Index weder 0 noch n-1 ist
+  (also höchstens **ein** Zwischenpunkt). Bei n=9 → Index 4 (der 5. Knoten).
+- Rendering:
+  - n == 2: `"You make your way from the <Start> to the <Ziel>."`
+  - n >= 3: `"You make your way from the <Start>, through the <Mitte>, to the <Ziel>."`
+
+(Artikel „the" bewusst einfach gehalten; reine Flavor-Zeile, leicht anpassbar.)
+
+## 8. Fehler-/Randfälle (Meldungen)
+
+| Fall | Meldung |
+|---|---|
+| `go` ohne Argument | "Go where? Try 'go north' or 'go to <room>'." |
+| Richtung ohne Exit | (bestehend) "You can't go <dir> from here." |
+| Richtung gesperrt / dunkel | (bestehend) Lock-Text / Dunkelheits-Hinweis |
+| Zielname unbekannt (unter besuchten) | "You don't know any direction or place called '<name>'." |
+| Ziel == aktueller Raum | "You're already in the <Name>." |
+| Ziel besucht, aber kein passierbarer Pfad | "You can't find a way there right now." |
+
+## 9. Tests
+
+- **`PathfinderTest`** (Welt inline, wie `MapLayoutTest`):
+  - kürzester Pfad über besuchte Räume (Länge + Knoten korrekt).
+  - unbesuchter Zwischenraum wird **nicht** als Wegpunkt genutzt (kein Pfad bzw.
+    Umweg nur über Besuchtes).
+  - kein Pfad durch einen Exit mit nicht erfüllter `ExitLock`-Bedingung; Pfad
+    erscheint, wenn die Flag gesetzt ist.
+  - kein Pfad in einen dunklen Raum ohne Licht; mit getragenem Licht erreichbar.
+  - unerreichbares Ziel → leere Liste.
+- **`GoCommand`-Tests** (Raum-Ziel):
+  - `go to <name>` läuft zum Ziel (currentRoom aktualisiert, Ziel-`look` erfolgt).
+  - Auflösung per id **und** per name (case-insensitive).
+  - unbekannter Name / Ziel==aktuell / kein Pfad → jeweilige Meldung.
+  - `go north` (Richtung) funktioniert weiterhin (Regressionsschutz).
+- **`travelStep`**: Default ist No-Op (Tests nutzen `TestIO`; keine Sleeps, keine
+  GUI). GUI-Animation wird manuell verifiziert (Konvention: keine GUI-Unit-Tests).
+
+## 10. Architektur-Werte / Risiken
+
+- **Gemeinsamer Loop bleibt**: nur eine neue `GameIO`-Default-Methode; Pacing/
+  Animation lebt im Renderer (`SwingIO`), Konsole No-Op. Keine Divergenz der Logik.
+- **Konsistenz mit manuellem Zug**: Pathfinder nutzt dieselben Gates (Lock, Licht)
+  wie `GoCommand` — kein Auto-Walk durch etwas, das man manuell nicht passieren darf.
+- **Fog of War**: nur besuchte Räume → kein Informationsleck über Unentdecktes.
+- **Algorithmus-Showcase**: klassisches BFS (Queue + `cameFrom`) mit
+  Standard-Collections (entspricht der Projekt-Entscheidung „keine eigenen
+  `uebung`-Strukturen"). `MapLayout` macht bereits BFS — `Pathfinder` ist die
+  fokussierte Wegfindungs-Variante (eigene Verantwortlichkeit, eigene Tests).
+- **GUI-Threading**: `travelStep` schläft auf dem Worker-Thread (wie `readLine`
+  blockiert), `setMap` zeichnet via EDT — kein Deadlock; EDT bleibt responsiv.
+- Risiko: lange Pfade × 300 ms könnten sich zäh anfühlen; bewusst akzeptiert (kurze
+  Karte). Später ggf. Settings-gesteuert.

Semesterprojekt/docs/superpowers/specs/2026-06-01-tutorial-design.md

@@ -0,0 +1,254 @@
+# Spec: Interaktives Start-Tutorial
+
+Stand: 2026-06-01. Dritte der verbleibenden Mechaniken (nach `use X on Y` und
+Pathfinding). Setzt das vom Nutzer gewünschte **interaktive Tutorial beim
+Spielstart, abbrechbar per `skip`** um. Baut auf dem geteilten Game-Loop,
+`CommandRegistry`/`CommandParser`, `GameIO` und dem datengetriebenen Loader auf.
+
+## 1. Kontext & Ziel
+
+Neue Spieler kennen die Befehle nicht. Ziel: ein **interaktiver Walkthrough** zu
+Beginn eines **Neuen Spiels**, der den Spieler im **echten Startraum** Schritt für
+Schritt die Kernbefehle ausführen lässt (er wartet, bis der jeweilige Befehl kam),
+mit Bestätigung/Hinweisen, und am Ende die übrigen Befehle als Tipps nennt.
+Jederzeit per `skip` überspringbar. Geladene Spielstände zeigen kein Tutorial.
+
+Bestätigte Entscheidungen (Brainstorming 2026-06-01):
+- **Stil**: interaktiv (wait-for-it) im echten Spiel, nicht in einer Sandbox.
+- **Kern-Bogen** (interaktiv, in Reihenfolge): `look` → `examine` → `take` →
+  `inventory` → `use` → `go` (Richtung) → `go to` (Pathfinding). Danach
+  **Abschluss-Tipps** für den Rest (read, drop, talk/give, use X on Y, map,
+  quests, save, menu).
+- **Abschluss-Erkennung verb-basiert** (alias-fähig): jede gültige Nutzung des
+  erwarteten Verbs zählt; optional `minArgs`.
+- **Datengetrieben**: `tutorial.yaml`; Logik (Verb-/Richtungs-Matching) im Code.
+- **Häufigkeit**: bei jedem Neuen Spiel; `skip` überspringt; keine Persistenz.
+- **Falscher (aber gültiger) Befehl**: wird **ausgeführt** (echtes Spiel) + sanfter
+  Hinweis, Schritt rückt **nicht** vor.
+- **Platzierung**: **nach** Banner + Willkommen + erstem Raum-`look`.
+
+## 2. Scope
+
+**In Scope:**
+- `TutorialGuide` (game), in den Game-Loop eingehängt (optional; null = kein Tutorial).
+- `Tutorial`/`TutorialStep` (model) + `TutorialDto`/`TutorialStepDto` (loader/dto)
+  + `TutorialLoader` (optionales `/world/tutorial.yaml`, eigener Loader — nicht in `World`).
+- `Game`: optionaler Guide (`setTutorialGuide`) + `begin`/`onCommand`/`skip`-Anbindung.
+- `App.play(..., withTutorial)`: Guide nur beim Neuen Spiel bauen.
+- `tutorial.yaml`: Intro, 7 Kern-Schritte, Abschluss-Tipps.
+- Tests: Guide-Logik, Loader, Game-Integration.
+
+**Out of Scope:**
+- Persistenz „Tutorial gesehen" / Settings-Toggle (eigene spätere Option).
+- Sandbox-Welt / Zurücksetzen von Tutorial-Aktionen (es ist das echte Spiel).
+- Erzwungenes `use X on Y` / `talk` etc. (nur in Abschluss-Tipps genannt).
+- GUI-Sonderdarstellung (Tutorial nutzt die normale styled Ausgabe; `skip` per Eingabe).
+
+## 3. Datenmodell (model)
+
+```java
+public record TutorialStep(
+        String instruction,   // an den Spieler: was tun
+        String expect,        // Verb-Name ("look"/"examine"/...) ODER "go_direction" / "go_to_room"
+        int minArgs,          // Mindest-Argumentzahl (z.B. 1 für take/examine/use); 0 default
+        String confirm,       // Bestätigung bei Erfolg
+        String hint           // sanfter Hinweis bei gültigem-aber-falschem Befehl
+) {}
+
+public record Tutorial(String intro, List<TutorialStep> steps, String closingTips) {
+    public Tutorial {
+        steps = steps == null ? List.of() : List.copyOf(steps);
+    }
+    public boolean isEmpty() { return steps.isEmpty(); }
+    public static Tutorial none() { return new Tutorial(null, List.of(), null); }
+}
+```
+
+`tutorial.yaml` (ein Mapping, optional):
+```yaml
+intro: |
+  Welcome. Let me show you the ropes — type the commands as I describe them.
+  (Type 'skip' at any time to jump straight into the game.)
+steps:
+  - instruction: "Look around the room: type 'look'."
+    expect: look
+    confirm: "Good — 'look' (or 'l') always re-describes where you are."
+    hint: "When you're ready, just type: look"
+  - instruction: "Examine something you see: 'examine <thing>' (or 'x <thing>')."
+    expect: examine
+    minArgs: 1
+    confirm: "That's how you inspect items, exits and people up close."
+    hint: "Try examining something, e.g.: examine lamp"
+  - instruction: "Pick something up: 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Taken. Items you carry go into your inventory."
+    hint: "Pick something up, e.g.: take lamp"
+  - instruction: "Check what you're carrying: 'inventory' (or 'i')."
+    expect: inventory
+    confirm: "That's your inventory."
+    hint: "Type: inventory"
+  - instruction: "Use an item: 'use <item>' (e.g. light the lamp)."
+    expect: use
+    minArgs: 1
+    confirm: "Some items toggle, read or react when used."
+    hint: "Use something, e.g.: use lamp"
+  - instruction: "Move to another room: 'go <direction>' (try 'go north')."
+    expect: go_direction
+    confirm: "You can move north/south/east/west between connected rooms."
+    hint: "Head somewhere, e.g.: go north"
+  - instruction: "Travel back to a room you've seen: 'go to <room>'."
+    expect: go_to_room
+    confirm: "Nice — 'go to <room>' auto-walks to any room you've already visited."
+    hint: "Try: go to <a room you've already visited>"
+closingTips: |
+  That's the core. A few more you'll want:
+  read · drop · talk to <npc> · give <item> to <npc> ·
+  use <item> on <item> (combine things) · map · quests · save · menu.
+  Type 'help' anytime. Good luck.
+```
+
+## 4. `TutorialLoader` (loader)
+
+- `loader/dto/TutorialDto` (`intro`, `List<TutorialStepDto> steps`, `closingTips`),
+  `loader/dto/TutorialStepDto` (`instruction`, `expect`, `Integer minArgs`, `confirm`, `hint`).
+- `TutorialLoader.load(basePath)` → `Tutorial`: liest `basePath + "/tutorial.yaml"`
+  optional (fehlt → `Tutorial.none()`), mappt DTO→Modell (`minArgs` null → 0).
+  Nutzt einen eigenen Jackson-`YAMLFactory`-Mapper wie `WorldLoader`. Default-Base
+  `/world` (überschreibbar für Tests). Parse-Fehler → `WorldLoadException`.
+- Bewusst **getrennt von `World`**: Tutorial ist Onboarding, kein Welt-Inhalt.
+
+## 5. `TutorialGuide` (game)
+
+Zustandsbehaftet (ein laufendes Tutorial), hält die Schritte + den Index + die
+`CommandRegistry` (für alias-fähiges Verb-Matching).
+
+```java
+public final class TutorialGuide {
+    private final Tutorial tutorial;
+    private final CommandRegistry registry;
+    private int index = 0;
+    private boolean active;
+    private Room roomAtStepStart;   // zum Erkennen echter Bewegung
+
+    public TutorialGuide(Tutorial tutorial, CommandRegistry registry) {
+        this.tutorial = tutorial; this.registry = registry;
+        this.active = !tutorial.isEmpty();
+    }
+    public boolean isActive() { return active; }
+
+    /** Druckt Intro + erste Anweisung (am Loop-Start, nach dem ersten look). */
+    public void begin(GameContext ctx) { if (active) { print intro; enterStep(ctx); } }
+
+    /** Nach jedem ausgeführten Befehl: prüft den aktuellen Schritt. */
+    public void onCommand(GameContext ctx, ParsedCommand parsed) {
+        if (!active) return;
+        TutorialStep step = tutorial.steps().get(index);
+        if (satisfies(step, ctx, parsed)) {
+            ctx.getIo().write(step.confirm());
+            index++;
+            if (index >= tutorial.steps().size()) { ctx.getIo().print(closingTips); active = false; }
+            else enterStep(ctx);
+        } else {
+            ctx.getIo().write(step.hint());   // gültiger-aber-falscher Befehl → Nudge
+        }
+    }
+
+    /** 'skip' während des Tutorials: Abbruch ohne Zug. */
+    public void skip(GameContext ctx) { if (active) { ctx.getIo().write("Tutorial skipped."); active = false; } }
+
+    /** Merkt den aktuellen Raum (für Bewegungs-Erkennung) und druckt die Anweisung. */
+    private void enterStep(GameContext ctx) {
+        roomAtStepStart = ctx.getPlayer().getCurrentRoom();
+        ctx.getIo().write(tutorial.steps().get(index).instruction());
+    }
+}
+```
+
+**`satisfies(step, ctx, parsed)`**:
+- `expect == "go_direction"` → `sameCommand(parsed.verb(), "go")` **und** `args` nicht leer
+  **und** erstes Arg ist eine Richtung (`Direction.fromString` wirft nicht) **und**
+  der Spieler ist **tatsächlich umgezogen** (`ctx.getPlayer().getCurrentRoom() != roomAtStepStart`).
+- `expect == "go_to_room"` → `sameCommand(parsed.verb(), "go")` **und** `args` nicht leer
+  **und** erstes Arg ist **keine** Richtung **und** der Spieler ist tatsächlich umgezogen.
+- sonst (Verb-Name) → `sameCommand(parsed.verb(), step.expect())` **und**
+  `args.size() >= step.minArgs()`.
+- `sameCommand(a, b)` = `registry.find(a)` und `registry.find(b)` beide präsent und
+  **dieselbe** Command-Instanz (alias-fähig: `l`==`look`, `x`==`examine`, `get`==`take`,
+  `i`==`inventory`).
+
+Die Bewegungs-Bedingung verhindert, dass ein **blockierter** Zug (z.B. `go south`
+in den dunklen Dungeon ohne Licht → kein Raumwechsel) den Schritt vorrückt — wichtig,
+damit für `go_to_room` danach wirklich zwei Räume besucht sind.
+
+Hinweis: `onCommand` wird nur nach einem **erfolgreich aufgelösten** Befehl gerufen;
+unbekannte Eingaben behandelt der Loop bereits („I don't understand …").
+
+## 6. Game-Loop-Anbindung (game/Game.java)
+
+- Neues optionales Feld `private TutorialGuide tutorialGuide;` + `setTutorialGuide(...)`
+  (Zwei-Phasen-Wiring wie `QuitCommand`/`MenuCommand`).
+- In `run()` **vor** der `while`-Schleife (nach dem initialen `publishHud`/`maybeEnd`):
+  `if (tutorialGuide != null) tutorialGuide.begin(ctx);`
+- In der Schleife, **vor** dem Dispatch: wenn `tutorialGuide != null &&
+  tutorialGuide.isActive() && parsed.verb().equals("skip")` → `tutorialGuide.skip(ctx);
+  publishHud(); continue;` (kein `turn++`).
+- **Nach** `cmd.get().execute(...); turn++;`:
+  `if (tutorialGuide != null) tutorialGuide.onCommand(ctx, parsed);`
+
+Der Guide ist in normalem/geladenem Spiel `null` → kein Overhead, kein Verhalten.
+
+## 7. App-Anbindung (App.java)
+
+- `App.run` lädt das Tutorial einmal beim Start: `Tutorial tutorial =
+  new TutorialLoader().load();` (wie Settings/SaveService).
+- `play(io, saves, session, boolean withTutorial)`: nach dem Registry-Aufbau, wenn
+  `withTutorial && !tutorial.isEmpty()` → `game.setTutorialGuide(new TutorialGuide(
+  tutorial, registry))`.
+- `case NEW_GAME -> play(io, saves, newSession(io), true);`
+  `LOAD -> play(io, saves, saves.load(slot.slug()), false);`
+- Reihenfolge in `play`: Banner → Willkommen → erstes `look` → `game.run()` (darin
+  `guide.begin`). Damit erscheint das Tutorial **nach** dem ersten Raumbild.
+
+## 8. Flow & Meldungen
+
+- Neues Spiel → Name → Banner/Willkommen → Raum-`look` → Intro + 1. Anweisung.
+- Spieler tippt Befehle (echte Ausführung); passender Befehl → `confirm` + nächste
+  Anweisung; falscher (gültiger) → `hint`. Nach dem letzten Schritt → `closingTips`,
+  Guide inaktiv, normales Spiel läuft weiter (Spieler steht, wo das Tutorial endete).
+- `skip` jederzeit → „Tutorial skipped." → normales Spiel.
+- Während des Tutorials laufen HUD/Karte/Quests/Autosave normal (es ist der echte Loop).
+
+## 9. Tests
+
+- **`TutorialGuideTest`** (Fake-`CommandRegistry` mit echten Command-Instanzen oder
+  reale Registry; `TestIO`):
+  - Alias-Match: `l` erfüllt `look`-Schritt; `x` erfüllt `examine`.
+  - `minArgs`: `take` ohne Arg erfüllt **nicht** (minArgs 1), `take lamp` schon.
+  - `go_direction` (Arg = Richtung) vs `go_to_room` (Arg = keine Richtung).
+  - Falscher gültiger Befehl → `hint`, kein Vorrücken.
+  - Vorrücken + `confirm`; nach letztem Schritt → `closingTips` + `isActive()==false`.
+  - `skip` → inaktiv, „Tutorial skipped.".
+- **`TutorialLoaderTest`**: lädt Fixture-`tutorial.yaml` → Intro/Steps/ClosingTips;
+  fehlende Datei → `Tutorial.none()` (`isEmpty()`).
+- **`GameTutorialTest`** (Integration): kleine Welt + reale Registry + `TestIO` mit
+  skript-Eingaben durch `game.run()`; prüft, dass `begin` druckt, Schritte bei
+  passenden Befehlen vorrücken, und `skip` beendet. (App-/GUI-Wiring manuell.)
+- Konvention: keine GUI-/YAML-abhängigen Domain-Tests außer dem Loader-Fixture.
+
+## 10. Architektur-Werte / Risiken
+
+- **Geteilter Loop bleibt zentral**: der Guide hängt sich minimal in `Game` ein;
+  Konsole und GUI verhalten sich identisch (normale styled Ausgabe, `skip` per Eingabe).
+- **Datengetrieben**: Schritte/Texte in `tutorial.yaml`; nur das Matching ist Code.
+  Verb-Matching nutzt die Registry (alias-fähig, keine hartkodierten Alias-Listen).
+- **Geringe Kopplung an Content**: Schritte sind verb-/richtungs-basiert (kein fixer
+  Item-Name nötig); ändert sich der Start-Content, bleibt das Tutorial gültig.
+  `go_to_room` funktioniert, weil nach dem `go`-Schritt zwei Räume besucht sind.
+- **Echtes Spiel, kein Sandbox**: Tutorial-Aktionen sind reale Züge (Turn/Quests/
+  Autosave laufen). Risiko: der Spieler „verbraucht" den ersten Raum — bewusst
+  akzeptiert (es ist die echte Welt; nichts geht verloren).
+- **`skip`-Sonderfall**: nur während aktivem Tutorial abgefangen; außerhalb bleibt
+  `skip` ein unbekanntes Verb (harmlos).
+- Risiko: `expect`-Tokens (`go_direction`/`go_to_room` + Verbnamen) sind ein kleines
+  bespoke Schema; dokumentiert in `tutorial.yaml`-Kommentar und im Loader.

Semesterprojekt/docs/superpowers/specs/2026-06-01-use-x-on-y-design.md

@@ -0,0 +1,206 @@
+# Spec: Item-Kombination `use X on Y`
+
+Stand: 2026-06-01. Erste der verbleibenden Mechaniken nach Hauptmenü +
+Speichern/Laden. Setzt das in `enhancement-ideas.md` #5b (Mechanik-Spine §4)
+festgelegte Item-Kombinations-Feature um. Baut auf der bestehenden
+Condition/Effect-Engine, dem datengetriebenen Loader (wie quests/endings) und
+dem vorhandenen `UseCommand` auf.
+
+## 1. Kontext & Ziel
+
+v1.0 hat bewusst argloses `use X` ohne Ziel gewählt. Ziel jetzt: **`use X on Y`**
+als datengetriebene **Kombinations-Mechanik** — ein Rezept kann Bedingungen
+prüfen, Items verbrauchen, ein Item erzeugen, Flags setzen und einen Text
+ausgeben. Deckt sowohl Transform (`matches + torch → lit_torch`) als auch
+Anwenden-auf-Ziel (`use key on door → effekt`) mit *einem* Modell ab.
+
+Bestätigte Entscheidungen (Brainstorming 2026-06-01):
+- **Allgemeine, datengetriebene Rezepte** (requires / consume / produce / effects
+  / response / failText) — Superset, nutzt die vorhandene Engine.
+- **Operanden** lösen aus **Inventar oder aktuellem Raum** auf (`use key on door`,
+  `use matches on torch`).
+- **Fehlschlag**: kein Rezept → generische Zeile; Rezept vorhanden aber `requires`
+  nicht erfüllt → optionales `failText` (Hinweis), sonst generische Zeile.
+- **Demo**: ein minimales Showcase-Rezept (`matches + torch → lit_torch`) plus die
+  wenigen dafür nötigen Items, in bestehende Räume gestellt.
+
+## 2. Scope
+
+**In Scope:**
+- `UseCommand`-Routing: 0 Args → "Use what?"; 1 Arg → bestehendes Einzel-`use`;
+  ≥2 Args → Kombination der ersten beiden Operanden.
+- `Combination`-Datenmodell + optionale `combinations.yaml` (geladen wie
+  quests/endings über `readListOptional`).
+- `CombinationDto` + Factory + `World.combinations` (Map mit kanonischem Paar-Key).
+- `Combinations`-Engine (`game`) — Auflösung, Lookup, requires/consume/produce/
+  effects/response/failText.
+- `WorldValidator`-Regeln: `a`/`b`/`consume`/`produce` referenzieren existierende
+  Item-Ids; keine doppelten Paare.
+- Minimales Demo-Rezept + Items.
+- Tests: Engine, UseCommand-Routing, Loader, Validator.
+
+**Out of Scope:**
+- Parser-Änderung — `on`/`with`/`to` sind **bereits** Filler (s. §3); keine neue
+  Grammatik nötig.
+- Mehrteilige (>2) Rezepte / Kombination aus 3+ Items.
+- Mehrwort-Item-Namen-Auflösung (Operanden lösen per Item-Id auf, wie heute).
+- Größerer Content-/Rätsel-Ausbau (eigenes Teilprojekt).
+
+## 3. Grammatik & Parsing (keine Änderung nötig)
+
+`CommandParser.FILLERS` enthält bereits `to`, `with`, `on`, `at`, `the`, `a`,
+`an`. Daher liefern alle drei Eingaben dieselbe Args-Liste:
+
+```
+use matches on torch    → verb=use, args=[matches, torch]
+use matches with torch  → verb=use, args=[matches, torch]
+use matches torch       → verb=use, args=[matches, torch]
+```
+
+`UseCommand` verzweigt nur über die Arg-Anzahl:
+
+```java
+if (args.isEmpty()) { io.write("Use what?"); return; }
+if (args.size() >= 2) { Combinations.tryUse(ctx, args.get(0), args.get(1)); return; }
+// 1 Arg: bestehende Einzel-use-Logik (Inventar dann Raum, item.use(ctx))
+```
+
+Bei ≥2 Args zählen die **ersten beiden** Tokens als Operandenpaar.
+
+## 4. Datenmodell (model)
+
+```java
+public record Combination(
+        String a, String b,            // Operanden-Item-Ids (ungeordnet)
+        List<Condition> requires,      // optional; leer = immer erfüllt
+        List<String> consume,          // Item-Ids, die entfernt werden
+        String produce,                // optional; Item-Id, die ins Inventar kommt (null = keins)
+        List<Effect> effects,          // optional; Flag-Mutationen
+        String response,               // Erfolgstext
+        String failText                // optional; Hinweis bei nicht erfüllten requires
+) {
+    public Combination {
+        requires = requires == null ? List.of() : List.copyOf(requires);
+        consume  = consume  == null ? List.of() : List.copyOf(consume);
+        effects  = effects  == null ? List.of() : List.copyOf(effects);
+    }
+    /** Kanonischer, reihenfolge-unabhängiger Schlüssel für ein Item-Paar. */
+    public static String key(String x, String y) {
+        return x.compareTo(y) <= 0 ? x + "|" + y : y + "|" + x;
+    }
+    public String key() { return key(a, b); }
+}
+```
+
+`combinations.yaml` (Demo):
+```yaml
+- a: matches
+  b: torch
+  consume: [matches]
+  produce: lit_torch
+  response: |
+    You strike the matches; the torch catches with a low hiss and steady glow.
+  # requires/effects/failText optional, hier nicht nötig
+```
+
+`World` erhält `Map<String, Combination> combinations` (Key = `Combination.key()`).
+Backward-kompatible Konstruktor-Überladung wie bei quests/endings.
+
+## 5. Kombinations-Engine (game/Combinations.java)
+
+Statische Utility wie `Conditions`/`Effects`/`Light`:
+
+```java
+public static void tryUse(GameContext ctx, String idX, String idY) {
+    Player p = ctx.getPlayer();
+    // 1. Beide Operanden auflösen (Inventar zuerst, dann aktueller Raum)
+    if (!present(ctx, idX)) { ctx.getIo().write(noSuch(idX)); return; }
+    if (!present(ctx, idY)) { ctx.getIo().write(noSuch(idY)); return; }
+    // 2. Rezept-Lookup über kanonischen Key
+    Combination c = ctx.getWorld().getCombinations().get(Combination.key(idX, idY));
+    if (c == null) { ctx.getIo().write("Nothing happens."); return; }
+    // 3. requires prüfen
+    if (!Conditions.all(c.requires(), ctx)) {
+        ctx.getIo().write(c.failText() != null ? c.failText() : "Nothing happens.");
+        return;
+    }
+    // 4. consume → produce → effects → response
+    for (String id : c.consume()) { removeFromAnywhere(ctx, id); }
+    if (c.produce() != null) {
+        Item produced = ctx.getWorld().getItems().get(c.produce());
+        p.addItem(produced);
+    }
+    Effects.applyAll(c.effects(), ctx);
+    ctx.getIo().print(/* response als StyledText */);
+}
+```
+
+Hilfsmethoden:
+- `present(ctx, id)` → Inventar **oder** aktueller Raum enthält `id`.
+- `removeFromAnywhere(ctx, id)` → `player.removeItem(id)`, sonst
+  `currentRoom.removeItem(id)`.
+- `noSuch(id)` → "There is no '<id>' here or in your inventory." (wie UseCommand).
+- Erzeugtes Item ist in `items.yaml` definiert, aber in **keinem** Raum platziert
+  (existiert in `world.getItems()`, „nirgends"), bis es gefertigt wird → dann ins
+  Inventar. Save/Load erfasst Item-Platzierung + Switch-Zustände bereits korrekt;
+  ungefertigte Items bleiben unplatziert.
+
+## 6. Loader-Anbindung
+
+- `CombinationDto` (Jackson-Record): `a, b, requires, consume, produce, effects,
+  response, failText`. `requires`/`effects` via `ConditionDto.toModelList` /
+  `EffectDto.toModelList` (vorhanden).
+- `WorldLoader`: `readListOptional(basePath + "/combinations.yaml", CombinationDto.class)`.
+- `CombinationFactory`: DTO → `Combination`; sammelt in `Map<String, Combination>`
+  per `Combination.key()`. Doppelter Key → `WorldLoadException`.
+- `World.combinations` + Getter; backward-kompatible Konstruktoren.
+
+## 7. Validierung (WorldValidator)
+
+- `a`, `b`, jede `consume`-Id und (falls gesetzt) `produce` müssen in der
+  Item-Registry existieren → sonst `WorldLoadException` mit klarer Meldung.
+- Doppelte Paar-Keys → Fehler (im Factory bereits abgefangen; Validator
+  dokumentiert die Regel).
+- `requires`/`effects` nutzen die bestehende Condition/Effect-Validierung, falls
+  vorhanden; sonst rein strukturell.
+
+## 8. Demo-Content (minimal)
+
+- `items.yaml`: `matches` (plain), `torch` (plain, `light: false`), `lit_torch`
+  (**plain mit `light: true`**). `Light.isActiveLight` wertet ein Nicht-Switchable
+  mit `light: true` als **immer aktive** Lichtquelle (nur SwitchableItems müssen
+  „on" sein) — also ist `lit_torch` eine dauerhaft brennende Lichtquelle, ohne
+  Toggle. `lit_torch` wird **nicht** in einem Raum platziert (entsteht nur durchs
+  Rezept).
+- `rooms.yaml`: `matches` und `torch` in erreichbare Räume legen.
+- `combinations.yaml`: das eine Rezept aus §4.
+- Spielbar nachweisbar: `take matches`, `take torch`, `use matches on torch` →
+  `lit_torch` im Inventar (Lichtquelle), `matches` verbraucht.
+
+## 9. Tests
+
+- **`CombinationsTest`**: ungeordneter Match (`X on Y` == `Y on X`); `requires`
+  erfüllt/nicht erfüllt (failText vs. generisch); consume aus Inventar **und** aus
+  Raum; produce landet im Inventar; effects gesetzt; kein Rezept → "Nothing
+  happens."; fehlender Operand → noSuch-Meldung.
+- **`UseCommand`-Routing**: 0 Args → "Use what?"; 1 Arg → `item.use` (bestehend);
+  2 Args → Combinations-Pfad (über Fake-/TestIO + kleine Welt).
+- **Loader**: `combinations.yaml` → `World.combinations` korrekt; Key-Kanonisierung;
+  doppeltes Paar → Exception.
+- **Validator**: unbekannte `a`/`b`/`consume`/`produce`-Id → `WorldLoadException`.
+- Konvention: keine GUI-/YAML-abhängigen Domain-Tests; Engine-Tests bauen Welt
+  inline wie `QuestEngineTest`.
+
+## 10. Architektur-Werte / Risiken
+
+- **Datengetrieben**: Rezepte in YAML, kein Hardcoding; gleiche DTO/Domain-Trennung
+  wie quests/endings.
+- **Geringe Kopplung**: neue `Combinations`-Utility neben `Conditions`/`Effects`;
+  `UseCommand` bekommt nur eine Verzweigung. Kein Parser-Eingriff.
+- **Reihenfolge-Unabhängigkeit** über kanonischen Key vermeidet doppelte Rezepte.
+- **Erzeugte Items** „aus dem Nichts": müssen in `items.yaml` definiert, aber
+  unplatziert sein — Validator stellt Existenz sicher; Save/Load erfasst sie nach
+  dem Fertigen automatisch.
+- Risiko: `produce` eines bereits irgendwo platzierten Items würde dieselbe Instanz
+  ins Inventar verschieben (Items sind Singletons). Demo vermeidet das (unplatziert).
+  Validator/Doku weist darauf hin.

Semesterprojekt/pom.xml

@@ -49,6 +49,18 @@
             <version>${logback.version}</version>
         </dependency>
 
+        <!-- OGG Vorbis decoding (GUI background music) -->
+        <dependency>
+            <groupId>com.googlecode.soundlibs</groupId>
+            <artifactId>vorbisspi</artifactId>
+            <version>1.0.3.3</version>
+        </dependency>
+        <dependency>
+            <groupId>com.googlecode.soundlibs</groupId>
+            <artifactId>jorbis</artifactId>
+            <version>0.0.17.4</version>
+        </dependency>
+
         <!-- Tests -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/App.java

@@ -21,12 +21,15 @@ import thb.jeanluc.adventure.command.impl.UseCommand;
 import thb.jeanluc.adventure.game.Game;
 import thb.jeanluc.adventure.game.GameContext;
 import thb.jeanluc.adventure.game.GameSession;
+import thb.jeanluc.adventure.game.TutorialGuide;
 import thb.jeanluc.adventure.io.ConsoleIO;
 import thb.jeanluc.adventure.io.GameIO;
 import thb.jeanluc.adventure.io.text.Banner;
+import thb.jeanluc.adventure.loader.TutorialLoader;
 import thb.jeanluc.adventure.loader.WorldLoader;
 import thb.jeanluc.adventure.menu.MainMenu;
 import thb.jeanluc.adventure.menu.SettingsMenu;
+import thb.jeanluc.adventure.model.Tutorial;
 import thb.jeanluc.adventure.save.SaveException;
 import thb.jeanluc.adventure.save.SaveService;
 import thb.jeanluc.adventure.save.SaveSlotInfo;
@@ -64,24 +67,23 @@ public final class App {
         SaveService saves = new SaveService();
         SettingsStore settingsStore = new SettingsStore();
         Settings settings = settingsStore.load();
-        ConsoleIO consoleIo = io instanceof ConsoleIO c ? c : null;
-        SettingsMenu.apply(settings, consoleIo);
+        SettingsMenu.apply(settings, io);
 
         boolean running = true;
         while (running) {
             switch (MainMenu.show(io)) {
-                case NEW_GAME -> play(io, saves, newSession(io));
+                case NEW_GAME -> play(io, saves, newSession(io), true);
                 case LOAD -> {
                     SaveSlotInfo slot = MainMenu.pickSlot(io, saves);
                     if (slot != null) {
                         try {
-                            play(io, saves, saves.load(slot.slug()));
+                            play(io, saves, saves.load(slot.slug()), false);
                         } catch (SaveException e) {
                             io.write("Could not load: " + e.getUserMessage());
                         }
                     }
                 }
-                case SETTINGS -> settings = SettingsMenu.show(io, settings, settingsStore, consoleIo);
+                case SETTINGS -> settings = SettingsMenu.show(io, settings, settingsStore);
                 case QUIT -> running = false;
             }
         }
@@ -96,7 +98,7 @@ public final class App {
     }
 
     /** Builds the registry, runs one game to completion, autosaving to its slot. */
-    private static void play(GameIO io, SaveService saves, GameSession session) {
+    private static void play(GameIO io, SaveService saves, GameSession session, boolean withTutorial) {
         GameContext ctx = new GameContext(session, io);
         ctx.setSaveCallback(() -> {
             try {
@@ -128,10 +130,18 @@ public final class App {
         registry.register(menu, "menu", "quit", "exit");
         registry.register(new HelpCommand(registry), "help", "?");
 
+        if (withTutorial) {
+            Tutorial tutorial = new TutorialLoader().load();
+            if (!tutorial.isEmpty()) {
+                game.setTutorialGuide(new TutorialGuide(tutorial, registry));
+            }
+        }
+
         io.print(Banner.welcome(session.getWorld().getTitle()));
         io.write(session.getWorld().getWelcomeMessage());
         new LookCommand().execute(ctx, List.of());
 
         game.run();
+        io.setMusic(null); // fade music out when returning to the menu
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/GoCommand.java

@@ -4,38 +4,48 @@ import thb.jeanluc.adventure.command.Command;
 import thb.jeanluc.adventure.game.Conditions;
 import thb.jeanluc.adventure.game.GameContext;
 import thb.jeanluc.adventure.game.Light;
+import thb.jeanluc.adventure.game.Pathfinder;
+import thb.jeanluc.adventure.map.MapLayout;
 import thb.jeanluc.adventure.model.Direction;
 import thb.jeanluc.adventure.model.ExitLock;
 import thb.jeanluc.adventure.model.Room;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
 /**
- * Moves the player into the room reachable in a given direction.
- * Usage: {@code go <direction>}.
+ * Moves the player. {@code go <direction>} steps once to a connected room.
+ * {@code go to <room>} auto-walks the shortest path (BFS) over already-visited
+ * rooms, honouring locked exits and darkness. Usage: {@code go <direction>} or
+ * {@code go to <room>}. The parser strips the filler word "to", so "go to
+ * &lt;room&gt;" and "go &lt;room&gt;" are equivalent.
  */
 public class GoCommand implements Command {
 
     @Override
     public void execute(GameContext ctx, List<String> args) {
         if (args.isEmpty()) {
-            ctx.getIo().write("Go where? Try 'go north'.");
+            ctx.getIo().write("Go where? Try 'go north' or 'go to <room>'.");
             return;
         }
-        Direction dir;
         try {
-            dir = Direction.fromString(args.getFirst());
-        } catch (IllegalArgumentException e) {
-            ctx.getIo().write("I don't know which way '" + args.getFirst() + "' is.");
-            return;
+            Direction dir = Direction.fromString(args.getFirst());
+            moveDirection(ctx, dir);
+        } catch (IllegalArgumentException notADirection) {
+            goToRoom(ctx, args);
         }
-        Optional<Room> next = ctx.getPlayer().getCurrentRoom().getExit(dir);
+    }
+
+    /** Single-step move in a compass direction (the original behaviour). */
+    private void moveDirection(GameContext ctx, Direction dir) {
+        Room here = ctx.getPlayer().getCurrentRoom();
+        Optional<Room> next = here.getExit(dir);
         if (next.isEmpty()) {
             ctx.getIo().write("You can't go " + dir.getLabel() + " from here.");
             return;
         }
-        ExitLock lock = ctx.getPlayer().getCurrentRoom().getExitLocks().get(dir);
+        ExitLock lock = here.getExitLocks().get(dir);
         if (lock != null && !Conditions.all(lock.requires(), ctx)) {
             ctx.getIo().write(lock.blocked());
             return;
@@ -49,8 +59,70 @@ public class GoCommand implements Command {
         new LookCommand().execute(ctx, List.of());
     }
 
+    /** Resolve a visited room by id/name and auto-walk the BFS path to it. */
+    private void goToRoom(GameContext ctx, List<String> args) {
+        String name = String.join(" ", args).toLowerCase();
+        Room target = resolveVisited(ctx, name);
+        if (target == null) {
+            ctx.getIo().write("You don't know any direction or place called '" + name + "'.");
+            return;
+        }
+        Room start = ctx.getPlayer().getCurrentRoom();
+        if (target == start) {
+            ctx.getIo().write("You're already in the " + target.getName() + ".");
+            return;
+        }
+        List<Room> path = Pathfinder.findPath(ctx, target);
+        if (path.isEmpty()) {
+            ctx.getIo().write("You can't find a way there right now.");
+            return;
+        }
+        List<Room> route = new ArrayList<>();
+        route.add(start);
+        route.addAll(path);
+        for (Room step : path) {
+            ctx.getPlayer().setCurrentRoom(step);
+            ctx.getIo().travelStep(MapLayout.compute(
+                    ctx.getWorld(), ctx.getPlayer().getVisitedRoomIds(), step));
+        }
+        ctx.getIo().write(summary(route));
+        new LookCommand().execute(ctx, List.of());
+    }
+
+    /** Finds a visited room whose id or display name matches {@code name}. */
+    private Room resolveVisited(GameContext ctx, String name) {
+        // the command test harness (CommandTestSupport) uses a null world; production always has one
+        if (ctx.getWorld() == null) {
+            return null;
+        }
+        for (String id : ctx.getPlayer().getVisitedRoomIds()) {
+            Room r = ctx.getWorld().getRooms().get(id);
+            if (r == null) {
+                continue;
+            }
+            if (id.equalsIgnoreCase(name) || r.getName().equalsIgnoreCase(name)) {
+                return r;
+            }
+        }
+        return null;
+    }
+
+    /** Names start, destination, and at most one middle waypoint. */
+    private String summary(List<Room> route) {
+        int n = route.size();
+        String start = route.get(0).getName();
+        String dest = route.get(n - 1).getName();
+        if (n >= 3) {
+            String middle = route.get(n / 2).getName();
+            return "You make your way from the " + start + ", through the " + middle
+                    + ", to the " + dest + ".";
+        }
+        return "You make your way from the " + start + " to the " + dest + ".";
+    }
+
     @Override
     public String help() {
-        return "go <direction>  -  move to the connected room (north/south/east/west)";
+        return "go <direction>  -  move one room (north/south/east/west); "
+                + "or  go to <room>  to travel to a known room";
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/UseCommand.java

@@ -1,6 +1,7 @@
 package thb.jeanluc.adventure.command.impl;
 
 import thb.jeanluc.adventure.command.Command;
+import thb.jeanluc.adventure.game.Combinations;
 import thb.jeanluc.adventure.game.GameContext;
 import thb.jeanluc.adventure.model.item.Item;
 
@@ -8,9 +9,10 @@ import java.util.List;
 import java.util.Optional;
 
 /**
- * Invokes the item-specific {@link Item#use(GameContext)} action. The
- * item must either be in the player's inventory or in the current room.
- * Usage: {@code use <item-id>}.
+ * With one argument, invokes the item-specific {@link Item#use(GameContext)}
+ * action; the item must be in the player's inventory or the current room.
+ * With two arguments ({@code use <item> on <item>}), delegates to the
+ * combination engine. Usage: {@code use <item>} or {@code use <item> on <item>}.
  */
 public class UseCommand implements Command {
 
@@ -20,6 +22,10 @@ public class UseCommand implements Command {
             ctx.getIo().write("Use what?");
             return;
         }
+        if (args.size() >= 2) {
+            Combinations.tryUse(ctx, args.get(0), args.get(1));
+            return;
+        }
         String itemId = args.getFirst();
         Optional<Item> item = ctx.getPlayer().findItem(itemId);
         if (item.isEmpty()) {
@@ -34,6 +40,6 @@ public class UseCommand implements Command {
 
     @Override
     public String help() {
-        return "use <item>  -  use an item (read it, switch it on/off, ...)";
+        return "use <item>  -  use an item; or  use <item> on <item>  to combine them";
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/Combinations.java

@@ -0,0 +1,69 @@
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+
+/**
+ * Applies {@code use X on Y} item combinations. Stateless utility, mirroring
+ * {@link Conditions}/{@link Effects}/{@link Light}. Operands resolve from the
+ * player's inventory or the current room.
+ */
+public final class Combinations {
+
+    private Combinations() {
+    }
+
+    /**
+     * Attempts to combine the two named items. Prints a resolution error if an
+     * operand is absent, the recipe's {@code failText} (or a generic line) if a
+     * recipe's requirements are unmet, "Nothing happens." if there is no recipe,
+     * or applies consume/produce/effects + the response on success.
+     */
+    public static void tryUse(GameContext ctx, String idX, String idY) {
+        if (!present(ctx, idX)) {
+            ctx.getIo().write(noSuch(idX));
+            return;
+        }
+        if (!present(ctx, idY)) {
+            ctx.getIo().write(noSuch(idY));
+            return;
+        }
+        Combination c = ctx.getWorld().getCombinations().get(Combination.key(idX, idY));
+        if (c == null) {
+            ctx.getIo().write("Nothing happens.");
+            return;
+        }
+        if (!Conditions.all(c.requires(), ctx)) {
+            ctx.getIo().write(c.failText() != null ? c.failText() : "Nothing happens.");
+            return;
+        }
+        for (String id : c.consume()) {
+            removeFromAnywhere(ctx, id);
+        }
+        if (c.produce() != null) {
+            Item produced = ctx.getWorld().getItems().get(c.produce());
+            if (produced != null) {
+                ctx.getPlayer().addItem(produced);
+            }
+        }
+        Effects.applyAll(c.effects(), ctx);
+        if (c.response() != null && !c.response().isBlank()) {
+            ctx.getIo().write(c.response());
+        }
+    }
+
+    private static boolean present(GameContext ctx, String id) {
+        return ctx.getPlayer().hasItem(id)
+                || ctx.getPlayer().getCurrentRoom().findItem(id).isPresent();
+    }
+
+    private static void removeFromAnywhere(GameContext ctx, String id) {
+        if (ctx.getPlayer().removeItem(id).isEmpty()) {
+            ctx.getPlayer().getCurrentRoom().removeItem(id);
+        }
+    }
+
+    private static String noSuch(String id) {
+        return "There is no '" + id + "' here or in your inventory.";
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/Game.java

@@ -32,12 +32,23 @@ public class Game {
     /** Loop flag. Flipped to false by {@link #stop()}. */
     private boolean running = true;
 
+    /** Optional onboarding guide; null in normal/loaded play. */
+    private TutorialGuide tutorialGuide;
+
+    /** Wires the interactive tutorial (New Game only). */
+    public void setTutorialGuide(TutorialGuide tutorialGuide) {
+        this.tutorialGuide = tutorialGuide;
+    }
+
     /**
      * Runs the loop until {@link #stop()} is called or input is exhausted.
      */
     public void run() {
         publishHud();
         maybeEnd();
+        if (tutorialGuide != null) {
+            tutorialGuide.begin(ctx);
+        }
         while (running) {
             String input = ctx.getIo().readLine();
             if (input == null) {
@@ -47,6 +58,12 @@ public class Game {
             if (parsed.verb().isEmpty()) {
                 continue;
             }
+            if (tutorialGuide != null && tutorialGuide.isActive()
+                    && parsed.verb().equals("skip")) {
+                tutorialGuide.skip(ctx);
+                publishHud();
+                continue;
+            }
             Optional<Command> cmd = registry.find(parsed.verb());
             if (cmd.isEmpty()) {
                 ctx.getIo().write("I don't understand '" + parsed.verb() + "'. Type 'help'.");
@@ -56,6 +73,9 @@ public class Game {
                 if (ctx.getSession().getTurn() % 10 == 0) {
                     ctx.save();
                 }
+                if (tutorialGuide != null && tutorialGuide.isActive()) {
+                    tutorialGuide.onCommand(ctx, parsed);
+                }
             }
             publishHud();
             maybeEnd();
@@ -64,6 +84,11 @@ public class Game {
 
     /** Ends the game if any ending's conditions are met, printing its screen. */
     private void maybeEnd() {
+        // Don't end the game (win or lose) while the player is still in the tutorial —
+        // a pending ending fires once the walkthrough finishes or is skipped.
+        if (tutorialGuide != null && tutorialGuide.isActive()) {
+            return;
+        }
         Ending e = EndingEngine.triggered(ctx);
         if (e != null) {
             ctx.getIo().print(EndingEngine.render(e, ctx, ctx.getSession().getTurn()));
@@ -84,6 +109,7 @@ public class Game {
                 ctx.getPlayer().getCurrentRoom());
         ctx.getIo().setMap(map);
         ctx.getIo().setQuests(QuestEngine.viewOf(ctx));
+        ctx.getIo().setMusic(ctx.getPlayer().getCurrentRoom().getMusic());
     }
 
     /**

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/Pathfinder.java

@@ -0,0 +1,76 @@
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.Set;
+
+/**
+ * Breadth-first shortest-path search over the rooms the player has already
+ * visited, honouring the same gates as a manual move: locked exits and
+ * darkness. Stateless utility, alongside {@link Conditions}/{@link Effects}/
+ * {@link Light}.
+ */
+public final class Pathfinder {
+
+    private Pathfinder() {
+    }
+
+    /**
+     * Finds the shortest path from the player's current room to {@code target}.
+     *
+     * @param ctx    active game context
+     * @param target destination room (expected to be a visited room)
+     * @return the rooms to step through, excluding the start and ending at
+     *         {@code target}; empty if there is no currently-passable path
+     *         (or {@code target} is the current room)
+     */
+    public static List<Room> findPath(GameContext ctx, Room target) {
+        Room start = ctx.getPlayer().getCurrentRoom();
+        Set<String> visited = ctx.getPlayer().getVisitedRoomIds();
+
+        Queue<Room> queue = new ArrayDeque<>();
+        Map<Room, Room> cameFrom = new HashMap<>();
+        queue.add(start);
+        cameFrom.put(start, null);
+
+        while (!queue.isEmpty()) {
+            Room current = queue.poll();
+            if (current == target) {
+                return reconstruct(cameFrom, target);
+            }
+            for (Map.Entry<Direction, Room> exit : current.getExits().entrySet()) {
+                Room next = exit.getValue();
+                if (cameFrom.containsKey(next) || !visited.contains(next.getId())) {
+                    continue;
+                }
+                ExitLock lock = current.getExitLocks().get(exit.getKey());
+                if (lock != null && !Conditions.all(lock.requires(), ctx)) {
+                    continue;
+                }
+                if (!Light.isLit(ctx, next)) {
+                    continue;
+                }
+                cameFrom.put(next, current);
+                queue.add(next);
+            }
+        }
+        return List.of();
+    }
+
+    /** Walks predecessors back from target to start; returns steps after start. */
+    private static List<Room> reconstruct(Map<Room, Room> cameFrom, Room target) {
+        LinkedList<Room> path = new LinkedList<>();
+        for (Room r = target; r != null && cameFrom.get(r) != null; r = cameFrom.get(r)) {
+            path.addFirst(r);
+        }
+        return path;
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/TutorialGuide.java

@@ -0,0 +1,123 @@
+package thb.jeanluc.adventure.game;
+
+import thb.jeanluc.adventure.command.Command;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.ParsedCommand;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+
+import java.util.Optional;
+
+/**
+ * Drives the interactive start-of-game walkthrough, layered onto the real game
+ * loop. Prints an instruction, then on each executed command decides whether the
+ * current step is satisfied (confirm + advance) or not (hint). Movement steps
+ * require an actual room change. Alias-aware via the {@link CommandRegistry}.
+ */
+public final class TutorialGuide {
+
+    private final Tutorial tutorial;
+    private final CommandRegistry registry;
+    private int index;
+    private boolean active;
+    private boolean begun;
+    private Room roomAtStepStart;
+
+    public TutorialGuide(Tutorial tutorial, CommandRegistry registry) {
+        this.tutorial = tutorial;
+        this.registry = registry;
+        this.active = !tutorial.isEmpty();
+    }
+
+    /** @return true while the walkthrough is still running. */
+    public boolean isActive() {
+        return active;
+    }
+
+    /** Prints the intro and the first instruction (call once at loop start). */
+    public void begin(GameContext ctx) {
+        if (!active || begun) {
+            return;
+        }
+        begun = true;
+        if (tutorial.intro() != null && !tutorial.intro().isBlank()) {
+            ctx.getIo().write(tutorial.intro());
+        }
+        enterStep(ctx);
+    }
+
+    /** Evaluates the current step against the command that was just executed. */
+    public void onCommand(GameContext ctx, ParsedCommand parsed) {
+        if (!active) {
+            return;
+        }
+        TutorialStep step = tutorial.steps().get(index);
+        if (satisfies(step, ctx, parsed)) {
+            ctx.getIo().write(step.confirm());
+            index++;
+            if (index >= tutorial.steps().size()) {
+                if (tutorial.closingTips() != null && !tutorial.closingTips().isBlank()) {
+                    ctx.getIo().write(tutorial.closingTips());
+                }
+                active = false;
+            } else {
+                enterStep(ctx);
+            }
+        } else {
+            ctx.getIo().write(step.hint());
+        }
+    }
+
+    /** Ends the tutorial early (the 'skip' command). */
+    public void skip(GameContext ctx) {
+        if (active) {
+            ctx.getIo().write("Tutorial skipped.");
+            active = false;
+        }
+    }
+
+    private void enterStep(GameContext ctx) {
+        roomAtStepStart = ctx.getPlayer().getCurrentRoom();
+        ctx.getIo().write(tutorial.steps().get(index).instruction());
+    }
+
+    private boolean satisfies(TutorialStep step, GameContext ctx, ParsedCommand parsed) {
+        String expect = step.expect();
+        if ("go_direction".equals(expect)) {
+            return isGo(parsed) && firstIsDirection(parsed) && moved(ctx);
+        }
+        if ("go_to_room".equals(expect)) {
+            return isGo(parsed) && !firstIsDirection(parsed) && moved(ctx);
+        }
+        return sameCommand(parsed.verb(), expect) && parsed.args().size() >= step.minArgs();
+    }
+
+    private boolean isGo(ParsedCommand p) {
+        return sameCommand(p.verb(), "go") && !p.args().isEmpty();
+    }
+
+    private boolean firstIsDirection(ParsedCommand p) {
+        if (p.args().isEmpty()) {
+            return false;
+        }
+        try {
+            Direction.fromString(p.args().get(0));
+            return true;
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+    }
+
+    private boolean moved(GameContext ctx) {
+        return roomAtStepStart != null
+                && ctx.getPlayer().getCurrentRoom() != roomAtStepStart;
+    }
+
+    private boolean sameCommand(String a, String b) {
+        Optional<Command> ca = registry.find(a);
+        Optional<Command> cb = registry.find(b);
+        return ca.isPresent() && cb.isPresent() && ca.get() == cb.get();
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java

@@ -44,6 +44,17 @@ public interface GameIO {
         // no-op
     }
 
+    /**
+     * One frame of an auto-walk (the {@code go to} command), as the player moves
+     * through a room en route. Default is a no-op: text mode travels silently.
+     * The GUI overrides this to repaint the map and pace the animation.
+     *
+     * @param view the map snapshot at this step
+     */
+    default void travelStep(MapView view) {
+        // no animation in text mode
+    }
+
     /** On-demand map (the 'map' command). Default renders ASCII (Unicode frames). */
     default void showMap(MapView view) {
         print(AsciiMap.render(view, true));
@@ -54,6 +65,16 @@ public interface GameIO {
         // no-op
     }
 
+    /** Per-turn current-room music track; null/blank = silence. Console no-op; GUI plays. */
+    default void setMusic(String track) {
+        // no audio in text mode
+    }
+
+    /** Applies the music volume/level. Console no-op; GUI sets it. */
+    default void setMusicLevel(MusicLevel level) {
+        // no audio in text mode
+    }
+
     /** On-demand quest log (the 'quests' command). Default renders styled text. */
     default void showQuests(QuestView view) {
         print(QuestText.render(view));

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/MusicBackend.java

@@ -0,0 +1,17 @@
+package thb.jeanluc.adventure.io;
+
+/** Raw audio operations — the only part that touches sound hardware. */
+public interface MusicBackend {
+
+    /** Fade the current track out, then start {@code track} (looping) and fade in to {@code gainDb}. */
+    void fadeTo(String track, float gainDb);
+
+    /** Fade the current track out and stop. */
+    void fadeOut();
+
+    /** Set the playback volume immediately. */
+    void setGainDb(float gainDb);
+
+    /** Stop playback and release resources. */
+    void shutdown();
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/MusicController.java

@@ -0,0 +1,55 @@
+package thb.jeanluc.adventure.io;
+
+import java.util.Objects;
+
+/**
+ * Frontend-agnostic music decision logic. Idempotent per track (never restarts
+ * the same track), fades to silence on a null/blank track, and honours the
+ * {@link MusicLevel} (OFF disables playback). Delegates raw operations to a
+ * {@link MusicBackend}.
+ */
+public final class MusicController {
+
+    private final MusicBackend backend;
+    private MusicLevel level = MusicLevel.MEDIUM;
+    private String current; // currently selected track, or null = silence
+
+    public MusicController(MusicBackend backend) {
+        this.backend = backend;
+    }
+
+    /** Called per turn with the current room's music field (may be null/blank). */
+    public void room(String track) {
+        if (!level.isOn()) {
+            return;
+        }
+        String next = (track == null || track.isBlank()) ? null : track;
+        if (Objects.equals(next, current)) {
+            return;
+        }
+        current = next;
+        if (next == null) {
+            backend.fadeOut();
+        } else {
+            backend.fadeTo(next, level.gainDb());
+        }
+    }
+
+    /** Applies a new music level (volume / off). */
+    public void level(MusicLevel newLevel) {
+        if (newLevel == this.level) {
+            return;
+        }
+        this.level = newLevel;
+        if (!newLevel.isOn()) {
+            backend.fadeOut();
+            current = null; // turning back on replays on the next room() call
+        } else {
+            backend.setGainDb(newLevel.gainDb());
+        }
+    }
+
+    public void shutdown() {
+        backend.shutdown();
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/MusicLevel.java

@@ -0,0 +1,26 @@
+package thb.jeanluc.adventure.io;
+
+/** Background-music volume level, cycled in the Settings menu. */
+public enum MusicLevel {
+    OFF, LOW, MEDIUM, HIGH;
+
+    /** Target MASTER_GAIN in decibels. Irrelevant for {@link #OFF} (playback disabled). */
+    public float gainDb() {
+        return switch (this) {
+            case OFF -> Float.NEGATIVE_INFINITY;
+            case LOW -> -20f;
+            case MEDIUM -> -10f;
+            case HIGH -> 0f;
+        };
+    }
+
+    /** @return true when music should play. */
+    public boolean isOn() {
+        return this != OFF;
+    }
+
+    /** Next level in the cycle (wraps HIGH → OFF). */
+    public MusicLevel next() {
+        return values()[(ordinal() + 1) % values().length];
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/OggMusicBackend.java

@@ -0,0 +1,155 @@
+package thb.jeanluc.adventure.io;
+
+import lombok.extern.slf4j.Slf4j;
+
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.FloatControl;
+import javax.sound.sampled.SourceDataLine;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+/**
+ * Streams OGG Vorbis tracks from the external {@code music/} folder through a
+ * {@link SourceDataLine}, looping, with ~400 ms gain fades. Decoding uses the
+ * vorbisspi/jorbis {@code javax.sound} SPI. All playback runs on a daemon
+ * thread; missing/undecodable files are logged and stay silent. GUI-only —
+ * verified manually.
+ */
+@Slf4j
+public final class OggMusicBackend implements MusicBackend {
+
+    private static final String MUSIC_DIR = "music";
+    private static final int FADE_MS = 400;
+    private static final int FADE_STEPS = 20;
+    private static final int BUFFER = 4096;
+    private static final float FLOOR_DB = -40f; // near-silence for fades
+
+    private volatile Thread playThread;
+    private volatile boolean stopping;
+    private volatile SourceDataLine line;
+    private volatile float targetGainDb = MusicLevel.MEDIUM.gainDb();
+
+    @Override
+    public synchronized void fadeTo(String track, float gainDb) {
+        stopCurrent();
+        targetGainDb = gainDb;
+        Path file = Path.of(MUSIC_DIR, track);
+        if (!Files.isReadable(file)) {
+            log.warn("Music file not found, staying silent: {}", file);
+            return;
+        }
+        stopping = false;
+        playThread = new Thread(() -> playLoop(file, gainDb), "music");
+        playThread.setDaemon(true);
+        playThread.start();
+    }
+
+    @Override
+    public synchronized void fadeOut() {
+        stopCurrent();
+    }
+
+    @Override
+    public synchronized void setGainDb(float gainDb) {
+        targetGainDb = gainDb;
+        SourceDataLine l = line;
+        if (l != null) {
+            applyGain(l, gainDb);
+        }
+    }
+
+    @Override
+    public synchronized void shutdown() {
+        stopCurrent();
+    }
+
+    /** Signals the play thread to stop and waits for its fade-out + cleanup. */
+    private void stopCurrent() {
+        Thread t = playThread;
+        if (t == null) {
+            return;
+        }
+        stopping = true;
+        try {
+            t.join(FADE_MS + 600L);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+        playThread = null;
+    }
+
+    private void playLoop(Path file, float gainDb) {
+        SourceDataLine l = null;
+        try {
+            while (!stopping) {
+                try (AudioInputStream in = AudioSystem.getAudioInputStream(file.toFile())) {
+                    AudioFormat base = in.getFormat();
+                    AudioFormat pcm = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+                            base.getSampleRate(), 16, base.getChannels(),
+                            base.getChannels() * 2, base.getSampleRate(), false);
+                    try (AudioInputStream din = AudioSystem.getAudioInputStream(pcm, in)) {
+                        if (l == null) {
+                            l = AudioSystem.getSourceDataLine(pcm);
+                            l.open(pcm);
+                            l.start();
+                            line = l;
+                            ramp(l, FLOOR_DB, gainDb); // fade in once
+                        }
+                        byte[] buf = new byte[BUFFER];
+                        int n;
+                        while (!stopping && (n = din.read(buf, 0, buf.length)) != -1) {
+                            l.write(buf, 0, n);
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Music playback failed for {}: {}", file, e.getMessage());
+        } finally {
+            if (l != null) {
+                try {
+                    ramp(l, currentGain(l), FLOOR_DB); // fade out
+                } catch (RuntimeException ignored) {
+                    // best-effort fade
+                }
+                l.stop();
+                l.close();
+            }
+            line = null;
+        }
+    }
+
+    private void ramp(SourceDataLine l, float fromDb, float toDb) {
+        for (int i = 0; i <= FADE_STEPS; i++) {
+            applyGain(l, fromDb + (toDb - fromDb) * i / FADE_STEPS);
+            sleep(FADE_MS / FADE_STEPS);
+        }
+    }
+
+    private float currentGain(SourceDataLine l) {
+        try {
+            return ((FloatControl) l.getControl(FloatControl.Type.MASTER_GAIN)).getValue();
+        } catch (IllegalArgumentException e) {
+            return targetGainDb;
+        }
+    }
+
+    private void applyGain(SourceDataLine l, float db) {
+        try {
+            FloatControl gain = (FloatControl) l.getControl(FloatControl.Type.MASTER_GAIN);
+            gain.setValue(Math.max(gain.getMinimum(), Math.min(gain.getMaximum(), db)));
+        } catch (IllegalArgumentException ignored) {
+            // line has no master-gain control on this platform
+        }
+    }
+
+    private void sleep(long ms) {
+        try {
+            Thread.sleep(ms);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/SwingIO.java

@@ -14,7 +14,6 @@ import javax.swing.Box;
 import javax.swing.BoxLayout;
 import javax.swing.JButton;
 import javax.swing.JComponent;
-import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
@@ -22,6 +21,7 @@ import javax.swing.JScrollPane;
 import javax.swing.JTextField;
 import javax.swing.JTextPane;
 import javax.swing.KeyStroke;
+import javax.swing.SwingConstants;
 import javax.swing.SwingUtilities;
 import javax.swing.text.BadLocationException;
 import javax.swing.text.SimpleAttributeSet;
@@ -29,10 +29,13 @@ import javax.swing.text.StyleConstants;
 import javax.swing.text.StyledDocument;
 import java.awt.BorderLayout;
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsEnvironment;
+import java.awt.GridBagLayout;
 import java.awt.Insets;
 import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
@@ -63,11 +66,15 @@ public class SwingIO implements GameIO {
     /** Unscaled size for the HUD and side-panel font, in points. */
     private static final float SMALL_SIZE = 12.5f;
 
+    /** Delay between rooms while animating a go-to auto-walk, in milliseconds. */
+    private static final long TRAVEL_STEP_MS = 300L;
+
     /** Side-panel width as a fraction of the window width, clamped by the bounds below. */
     private static final double SIDE_RATIO = 0.28;
     private static final int SIDE_MIN = 180;
     private static final int SIDE_MAX = 460;
 
+    private final MusicController music = new MusicController(new OggMusicBackend());
     private final LinkedBlockingQueue<String> inputs = new LinkedBlockingQueue<>();
     private final JFrame frame;
     private final JTextPane output;
@@ -138,6 +145,7 @@ public class SwingIO implements GameIO {
             public void componentResized(ComponentEvent e) {
                 updateSideWidth();
                 applyFonts();
+                rescaleMenuOverlayIfVisible();
             }
         });
 
@@ -326,11 +334,31 @@ public class SwingIO implements GameIO {
         SwingUtilities.invokeLater(() -> hud.setText(txt));
     }
 
+    @Override
+    public void setMusic(String track) {
+        music.room(track);
+    }
+
+    @Override
+    public void setMusicLevel(MusicLevel level) {
+        music.level(level);
+    }
+
     @Override
     public void setMap(MapView view) {
         map.show(view);
     }
 
+    @Override
+    public void travelStep(MapView view) {
+        setMap(view);
+        try {
+            Thread.sleep(TRAVEL_STEP_MS);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
     @Override
     public void setQuests(QuestView view) {
         quests.show(view);
@@ -348,41 +376,12 @@ public class SwingIO implements GameIO {
 
     @Override
     public int choose(String title, List<String> options) {
-        // Same EDT↔worker handoff as readLine: the worker blocks on take(),
-        // the EDT (button click / window close) offers the chosen index.
+        // Full-window overlay (glass pane), not a floating dialog: it covers the game
+        // chrome so no panels/outlines show behind the menu, and it fills + scales with
+        // the window. EDT↔worker handoff as in readLine: the worker blocks on take(),
+        // a button click / Escape offers the chosen index.
         LinkedBlockingQueue<Integer> picked = new LinkedBlockingQueue<>();
-        SwingUtilities.invokeLater(() -> {
-            JDialog dialog = new JDialog(frame, title, true);
-            JPanel panel = new JPanel();
-            panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
-            panel.setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));
-            panel.add(new JLabel(title));
-            panel.add(Box.createVerticalStrut(8));
-            for (int i = 0; i < options.size(); i++) {
-                int idx = i;
-                JButton b = new JButton(options.get(i));
-                b.setAlignmentX(0f);
-                b.addActionListener(e -> {
-                    dialog.dispose();
-                    picked.offer(idx);
-                });
-                panel.add(b);
-                panel.add(Box.createVerticalStrut(4));
-            }
-            // Closing the dialog counts as the last (safe/cancel) option.
-            dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
-            dialog.addWindowListener(new java.awt.event.WindowAdapter() {
-                @Override
-                public void windowClosing(java.awt.event.WindowEvent e) {
-                    dialog.dispose();
-                    picked.offer(options.size() - 1);
-                }
-            });
-            dialog.setContentPane(panel);
-            dialog.pack();
-            dialog.setLocationRelativeTo(frame);
-            dialog.setVisible(true);
-        });
+        SwingUtilities.invokeLater(() -> showMenuOverlay(title, options, picked));
         try {
             return picked.take();
         } catch (InterruptedException e) {
@@ -391,6 +390,123 @@ public class SwingIO implements GameIO {
         }
     }
 
+    /** Current menu being shown, so a window resize can rebuild it at the new scale. */
+    private String menuTitle;
+    private List<String> menuOptions;
+    private LinkedBlockingQueue<Integer> menuPicked;
+
+    /** Rebuilds the visible menu overlay at the current window scale (called on resize). */
+    private void rescaleMenuOverlayIfVisible() {
+        if (menuOptions != null && frame.getGlassPane().isVisible()) {
+            showMenuOverlay(menuTitle, menuOptions, menuPicked);
+        }
+    }
+
+    /** Installs the menu as the frame's glass pane (covers everything) and shows it. */
+    private void showMenuOverlay(String title, List<String> options, LinkedBlockingQueue<Integer> picked) {
+        menuTitle = title;
+        menuOptions = options;
+        menuPicked = picked;
+        float scale = frameScale() * zoom; // same scaling the rest of the UI uses
+
+        JPanel glass = new JPanel(new GridBagLayout());
+        glass.setOpaque(true);
+        glass.setBackground(MENU_BG);
+        glass.addMouseListener(new java.awt.event.MouseAdapter() { }); // swallow backdrop clicks
+
+        JPanel card = new JPanel();
+        card.setOpaque(false);
+        card.setLayout(new BoxLayout(card, BoxLayout.Y_AXIS));
+
+        JLabel heading = new JLabel(title.toUpperCase());
+        heading.setForeground(MENU_TITLE);
+        heading.setFont(baseFont.deriveFont(Font.BOLD, BASE_SIZE * scale * 1.6f));
+        heading.setAlignmentX(Component.CENTER_ALIGNMENT);
+        heading.setBorder(BorderFactory.createEmptyBorder(0, 0, (int) (22 * scale), 0));
+        card.add(heading);
+
+        Runnable cancel = () -> {
+            hideMenuOverlay();
+            picked.offer(options.size() - 1);
+        };
+        for (int i = 0; i < options.size(); i++) {
+            int idx = i;
+            JButton b = menuButton(options.get(i), scale);
+            b.addActionListener(e -> {
+                hideMenuOverlay();
+                picked.offer(idx);
+            });
+            card.add(b);
+            if (i < options.size() - 1) {
+                card.add(Box.createVerticalStrut((int) (10 * scale)));
+            }
+        }
+
+        // Escape selects the last (safe/cancel) option — mirrors the console EOF convention.
+        glass.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
+                .put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "menuCancel");
+        glass.getActionMap().put("menuCancel", action(e -> cancel.run()));
+
+        glass.add(card); // single child → centered by GridBagLayout
+        frame.setGlassPane(glass);
+        glass.setVisible(true);
+        glass.requestFocusInWindow();
+    }
+
+    private void hideMenuOverlay() {
+        menuOptions = null; // stop resize rebuilds once the menu is dismissed
+        frame.getGlassPane().setVisible(false);
+    }
+
+    /** Palette for the themed menu overlay, matching the game window's dark look. */
+    private static final Color MENU_BG = new Color(0x0b, 0x0e, 0x13);
+    private static final Color MENU_TITLE = new Color(0xc9, 0x8a, 0xe0);
+    private static final Color BTN_BG = new Color(0x16, 0x1b, 0x24);
+    private static final Color BTN_BG_HOVER = new Color(0x22, 0x2a, 0x37);
+    private static final Color BTN_FG = new Color(0xcf, 0xd6, 0xe0);
+    private static final Color BTN_LINE = new Color(0x2a, 0x2f, 0x3a);
+    private static final Color BTN_LINE_HOVER = new Color(0x6f, 0xcf, 0x73);
+
+    /** A flat, dark, fixed-width menu button matching the game palette, with hover feedback. */
+    private JButton menuButton(String text, float scale) {
+        int padV = (int) (11 * scale);
+        int padH = (int) (18 * scale);
+        JButton b = new JButton(text);
+        b.setFont(baseFont.deriveFont(BASE_SIZE * scale));
+        b.setForeground(BTN_FG);
+        b.setBackground(BTN_BG);
+        b.setFocusPainted(false);
+        b.setOpaque(true);
+        b.setHorizontalAlignment(SwingConstants.LEFT);
+        b.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
+        b.setAlignmentX(Component.CENTER_ALIGNMENT);
+        b.setBorder(menuButtonBorder(BTN_LINE, padV, padH));
+        Dimension size = new Dimension((int) (340 * scale), b.getPreferredSize().height);
+        b.setPreferredSize(size);
+        b.setMinimumSize(size);
+        b.setMaximumSize(size);
+        b.addMouseListener(new java.awt.event.MouseAdapter() {
+            @Override
+            public void mouseEntered(java.awt.event.MouseEvent e) {
+                b.setBackground(BTN_BG_HOVER);
+                b.setBorder(menuButtonBorder(BTN_LINE_HOVER, padV, padH));
+            }
+
+            @Override
+            public void mouseExited(java.awt.event.MouseEvent e) {
+                b.setBackground(BTN_BG);
+                b.setBorder(menuButtonBorder(BTN_LINE, padV, padH));
+            }
+        });
+        return b;
+    }
+
+    private static javax.swing.border.Border menuButtonBorder(Color line, int padV, int padH) {
+        return BorderFactory.createCompoundBorder(
+                BorderFactory.createLineBorder(line, 1),
+                BorderFactory.createEmptyBorder(padV, padH, padV, padH));
+    }
+
     private void addList(List<Span> spans, List<String> xs, Style st) {
         for (int i = 0; i < xs.size(); i++) {
             if (i > 0) {

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/CombinationFactory.java

@@ -0,0 +1,53 @@
+package thb.jeanluc.adventure.loader;
+
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
+import thb.jeanluc.adventure.loader.dto.ConditionDto;
+import thb.jeanluc.adventure.loader.dto.EffectDto;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+
+import java.util.List;
+import java.util.Map;
+
+/** Builds {@link Combination}s from {@link CombinationDto}s, validating item ids. */
+public final class CombinationFactory {
+
+    private CombinationFactory() {
+    }
+
+    public static Combination fromDto(CombinationDto dto, Map<String, Item> items) {
+        requireItem(items, dto.a(), "a");
+        requireItem(items, dto.b(), "b");
+        if (dto.a().equals(dto.b())) {
+            throw new WorldLoadException(
+                    "Combination cannot combine an item with itself: '" + dto.a() + "'");
+        }
+        if (dto.consume() != null) {
+            for (String id : dto.consume()) {
+                requireItem(items, id, "consume");
+            }
+        }
+        if (dto.produce() != null) {
+            requireItem(items, dto.produce(), "produce");
+        }
+        return new Combination(
+                dto.a(),
+                dto.b(),
+                ConditionDto.toModelList(dto.requires()),
+                dto.consume() == null ? List.of() : List.copyOf(dto.consume()),
+                dto.produce(),
+                EffectDto.toModelList(dto.effects()),
+                dto.response(),
+                dto.failText());
+    }
+
+    private static void requireItem(Map<String, Item> items, String id, String field) {
+        if (id == null) {
+            throw new WorldLoadException("Combination '" + field + "' is missing an item id");
+        }
+        if (!items.containsKey(id)) {
+            throw new WorldLoadException(
+                    "Combination references unknown item '" + id + "' (field '" + field + "')");
+        }
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/RoomFactory.java

@@ -21,6 +21,7 @@ public final class RoomFactory {
     public static Room shellFromDto(RoomDto dto) {
         Room room = new Room(dto.id(), dto.name(), dto.description());
         room.setDark(Boolean.TRUE.equals(dto.dark()));
+        room.setMusic(dto.music());
         return room;
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/TutorialLoader.java

@@ -0,0 +1,63 @@
+package thb.jeanluc.adventure.loader;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import thb.jeanluc.adventure.loader.dto.TutorialDto;
+import thb.jeanluc.adventure.loader.dto.TutorialStepDto;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Loads the optional onboarding tutorial from {@code <base>/tutorial.yaml}.
+ * Kept separate from {@link WorldLoader}: the tutorial is onboarding, not world
+ * content. Returns {@link Tutorial#none()} when the file is absent.
+ */
+public class TutorialLoader {
+
+    /** Default classpath base directory. */
+    public static final String DEFAULT_BASE = "/world";
+
+    private final ObjectMapper yaml = new ObjectMapper(new YAMLFactory());
+    private final String basePath;
+
+    public TutorialLoader() {
+        this(DEFAULT_BASE);
+    }
+
+    public TutorialLoader(String basePath) {
+        this.basePath = basePath;
+    }
+
+    /** Reads the tutorial; absent file → {@link Tutorial#none()}. */
+    public Tutorial load() {
+        String resource = basePath + "/tutorial.yaml";
+        try (InputStream in = getClass().getResourceAsStream(resource)) {
+            if (in == null) {
+                return Tutorial.none();
+            }
+            TutorialDto dto = yaml.readValue(in, TutorialDto.class);
+            if (dto == null) {
+                return Tutorial.none();
+            }
+            List<TutorialStep> steps = new ArrayList<>();
+            if (dto.steps() != null) {
+                for (TutorialStepDto s : dto.steps()) {
+                    steps.add(new TutorialStep(
+                            s.instruction(),
+                            s.expect(),
+                            s.minArgs() == null ? 0 : s.minArgs(),
+                            s.confirm(),
+                            s.hint()));
+                }
+            }
+            return new Tutorial(dto.intro(), steps, dto.closingTips());
+        } catch (IOException e) {
+            throw new WorldLoadException("Failed to parse " + resource, e);
+        }
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/WorldLoader.java

@@ -5,12 +5,14 @@ import com.fasterxml.jackson.databind.type.CollectionType;
 import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
 import thb.jeanluc.adventure.loader.dto.EndingDto;
 import thb.jeanluc.adventure.loader.dto.GameDto;
 import thb.jeanluc.adventure.loader.dto.ItemDto;
 import thb.jeanluc.adventure.loader.dto.NpcDto;
 import thb.jeanluc.adventure.loader.dto.QuestDto;
 import thb.jeanluc.adventure.loader.dto.RoomDto;
+import thb.jeanluc.adventure.model.Combination;
 import thb.jeanluc.adventure.model.Ending;
 import thb.jeanluc.adventure.model.Npc;
 import thb.jeanluc.adventure.model.Player;
@@ -75,6 +77,8 @@ public class WorldLoader {
         List<RoomDto> roomDtos = readList(basePath + "/rooms.yaml", RoomDto.class);
         List<QuestDto> questDtos = readListOptional(basePath + "/quests.yaml", QuestDto.class);
         List<EndingDto> endingDtos = readListOptional(basePath + "/endings.yaml", EndingDto.class);
+        List<CombinationDto> combinationDtos =
+                readListOptional(basePath + "/combinations.yaml", CombinationDto.class);
         GameDto gameDto = readSingle(basePath + "/game.yaml", GameDto.class);
 
         requireUniqueIds("item", itemDtos.stream().map(ItemDto::id).toList());
@@ -104,6 +108,16 @@ public class WorldLoader {
             endings.add(EndingFactory.fromDto(dto));
         }
 
+        Map<String, Combination> combinations = new HashMap<>();
+        for (CombinationDto dto : combinationDtos) {
+            Combination c = CombinationFactory.fromDto(dto, items);
+            String key = c.key();
+            if (combinations.containsKey(key)) {
+                throw new WorldLoadException("Duplicate combination for pair '" + key + "'");
+            }
+            combinations.put(key, c);
+        }
+
         ReferenceResolver resolver = new ReferenceResolver(items, npcs, rooms);
         resolver.resolveRooms(roomDtos);
         resolver.resolveNpcs(npcDtos);
@@ -115,7 +129,7 @@ public class WorldLoader {
         Player player = new Player(start, gold);
 
         World world = new World(rooms, items, npcs,
-                gameDto.title(), gameDto.welcomeMessage(), quests, endings);
+                gameDto.title(), gameDto.welcomeMessage(), quests, endings, combinations);
         log.info("World '{}' loaded: {} rooms, {} items, {} npcs",
                 gameDto.title(), rooms.size(), items.size(), npcs.size());
         return new LoadResult(world, player);

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/CombinationDto.java

@@ -0,0 +1,16 @@
+package thb.jeanluc.adventure.loader.dto;
+
+import java.util.List;
+
+/** YAML representation of an item-combination recipe. */
+public record CombinationDto(
+        String a,
+        String b,
+        List<ConditionDto> requires,
+        List<String> consume,
+        String produce,
+        List<EffectDto> effects,
+        String response,
+        String failText
+) {
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/RoomDto.java

@@ -15,6 +15,7 @@ import java.util.Map;
  * @param exitLocks   optional condition-gates per exit direction
  * @param descriptionStates optional condition-gated description variants
  * @param dark        whether this room is dark; nullable
+ * @param music       optional GUI background-music track filename; null = none
  */
 public record RoomDto(
         String id,
@@ -25,11 +26,12 @@ public record RoomDto(
         List<String> npcs,
         List<ExitLockDto> exitLocks,
         List<DescriptionStateDto> descriptionStates,
-        Boolean dark
+        Boolean dark,
+        String music
 ) {
     /** Backward-compatible constructor without the optional state fields. */
     public RoomDto(String id, String name, String description,
                    Map<String, String> exits, List<String> items, List<String> npcs) {
-        this(id, name, description, exits, items, npcs, null, null, null);
+        this(id, name, description, exits, items, npcs, null, null, null, null);
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/TutorialDto.java

@@ -0,0 +1,7 @@
+package thb.jeanluc.adventure.loader.dto;
+
+import java.util.List;
+
+/** YAML representation of the tutorial document. */
+public record TutorialDto(String intro, List<TutorialStepDto> steps, String closingTips) {
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/TutorialStepDto.java

@@ -0,0 +1,11 @@
+package thb.jeanluc.adventure.loader.dto;
+
+/** YAML representation of a tutorial step. */
+public record TutorialStepDto(
+        String instruction,
+        String expect,
+        Integer minArgs,
+        String confirm,
+        String hint
+) {
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/menu/SettingsMenu.java

@@ -7,45 +7,41 @@ import thb.jeanluc.adventure.save.SettingsStore;
 
 import java.util.List;
 
-/** Minimal settings screen: toggle colour and glyph mode; persists + applies. */
+/** Settings screen: cycle colour, glyph, and music level; persists + applies. */
 public final class SettingsMenu {
 
     private SettingsMenu() {
     }
 
-    /**
-     * Loops the settings screen until the player picks "Back", persisting and
-     * applying each change. Returns the final settings.
-     *
-     * @param io       active IO
-     * @param current  starting settings
-     * @param store    where to persist
-     * @param consoleIo the console IO to apply changes to live, or null if not console
-     */
-    public static Settings show(GameIO io, Settings current, SettingsStore store, ConsoleIO consoleIo) {
+    /** Loops the settings screen until "Back", persisting + applying each change. */
+    public static Settings show(GameIO io, Settings current, SettingsStore store) {
         Settings s = current;
         while (true) {
             int i = io.choose("SETTINGS", List.of(
                     "Colour: " + s.colorMode(),
                     "Glyphs: " + s.glyphMode(),
+                    "Music: " + s.musicLevel(),
                     "Back"));
             if (i == 0) {
-                s = new Settings(nextColor(s.colorMode()), s.glyphMode());
+                s = new Settings(nextColor(s.colorMode()), s.glyphMode(), s.musicLevel());
             } else if (i == 1) {
-                s = new Settings(s.colorMode(), nextGlyph(s.glyphMode()));
+                s = new Settings(s.colorMode(), nextGlyph(s.glyphMode()), s.musicLevel());
+            } else if (i == 2) {
+                s = new Settings(s.colorMode(), s.glyphMode(), s.musicLevel().next());
             } else {
                 return s;
             }
             store.save(s);
-            apply(s, consoleIo);
+            apply(s, io);
         }
     }
 
-    /** Applies colour/glyph settings to the console IO (no-op if null). */
-    public static void apply(Settings s, ConsoleIO consoleIo) {
-        if (consoleIo != null) {
-            consoleIo.setColorMode(s.colorMode());
-            consoleIo.setGlyphMode(s.glyphMode());
+    /** Applies settings to the IO: music level always; colour/glyph only on the console. */
+    public static void apply(Settings s, GameIO io) {
+        io.setMusicLevel(s.musicLevel());
+        if (io instanceof ConsoleIO c) {
+            c.setColorMode(s.colorMode());
+            c.setGlyphMode(s.glyphMode());
         }
     }
 

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/Combination.java

@@ -0,0 +1,35 @@
+package thb.jeanluc.adventure.model;
+
+import java.util.List;
+
+/**
+ * A data-driven item-combination recipe. Identified by an unordered pair of
+ * item ids ({@code a}, {@code b}). When applied it may require conditions,
+ * consume items, produce an item, apply effects, and print a response.
+ */
+public record Combination(
+        String a,
+        String b,
+        List<Condition> requires,
+        List<String> consume,
+        String produce,
+        List<Effect> effects,
+        String response,
+        String failText
+) {
+    public Combination {
+        requires = requires == null ? List.of() : List.copyOf(requires);
+        consume = consume == null ? List.of() : List.copyOf(consume);
+        effects = effects == null ? List.of() : List.copyOf(effects);
+    }
+
+    /** Order-independent key for an item pair (sorted, '|'-joined). */
+    public static String key(String x, String y) {
+        return x.compareTo(y) <= 0 ? x + "|" + y : y + "|" + x;
+    }
+
+    /** This recipe's canonical pair key. */
+    public String key() {
+        return key(a, b);
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/Room.java

@@ -55,6 +55,10 @@ public class Room {
     @Setter
     private boolean dark;
 
+    /** Optional GUI background-music track filename for this room; null = none. */
+    @Setter
+    private String music;
+
     /**
      * Connects this room to another in the given direction. Does not
      * create the reverse connection — callers must set that up

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/Tutorial.java

@@ -0,0 +1,20 @@
+package thb.jeanluc.adventure.model;
+
+import java.util.List;
+
+/** Onboarding walkthrough: an intro, ordered steps, and closing tips. */
+public record Tutorial(String intro, List<TutorialStep> steps, String closingTips) {
+
+    public Tutorial {
+        steps = steps == null ? List.of() : List.copyOf(steps);
+    }
+
+    public boolean isEmpty() {
+        return steps.isEmpty();
+    }
+
+    /** An absent tutorial (no steps). */
+    public static Tutorial none() {
+        return new Tutorial(null, List.of(), null);
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/TutorialStep.java

@@ -0,0 +1,16 @@
+package thb.jeanluc.adventure.model;
+
+/**
+ * One interactive tutorial step: an instruction, the command that satisfies it
+ * ({@code expect} is a verb name like "look", or "go_direction"/"go_to_room"),
+ * a minimum argument count, a success confirmation, and a hint for a valid but
+ * wrong command.
+ */
+public record TutorialStep(
+        String instruction,
+        String expect,
+        int minArgs,
+        String confirm,
+        String hint
+) {
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/World.java

@@ -37,15 +37,24 @@ public class World {
     /** Ordered list of endings (first matching one wins). */
     private final List<Ending> endings;
 
-    /** Backward-compatible constructor for worlds without quests or endings. */
+    /** Global lookup of combination recipes by canonical pair key. */
+    private final Map<String, Combination> combinations;
+
+    /** Backward-compatible constructor for worlds without quests, endings, or combinations. */
     public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
                  String title, String welcomeMessage) {
-        this(rooms, items, npcs, title, welcomeMessage, Map.of(), List.of());
+        this(rooms, items, npcs, title, welcomeMessage, Map.of(), List.of(), Map.of());
     }
 
-    /** Backward-compatible constructor for worlds with quests but no endings. */
+    /** Backward-compatible constructor for worlds with quests but no endings/combinations. */
     public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
                  String title, String welcomeMessage, Map<String, Quest> quests) {
-        this(rooms, items, npcs, title, welcomeMessage, quests, List.of());
+        this(rooms, items, npcs, title, welcomeMessage, quests, List.of(), Map.of());
+    }
+
+    /** Backward-compatible constructor for worlds with quests + endings but no combinations. */
+    public World(Map<String, Room> rooms, Map<String, Item> items, Map<String, Npc> npcs,
+                 String title, String welcomeMessage, Map<String, Quest> quests, List<Ending> endings) {
+        this(rooms, items, npcs, title, welcomeMessage, quests, endings, Map.of());
     }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/save/Settings.java

@@ -1,11 +1,29 @@
 package thb.jeanluc.adventure.save;
 
 import thb.jeanluc.adventure.io.ConsoleIO;
+import thb.jeanluc.adventure.io.MusicLevel;
 
-/** Persisted user preferences (minimal: colour + glyph fidelity). */
-public record Settings(ConsoleIO.ColorMode colorMode, ConsoleIO.GlyphMode glyphMode) {
+/** Persisted user preferences (colour + glyph fidelity + music level). */
+public record Settings(ConsoleIO.ColorMode colorMode, ConsoleIO.GlyphMode glyphMode, MusicLevel musicLevel) {
+
+    public Settings {
+        if (colorMode == null) {
+            colorMode = ConsoleIO.ColorMode.AUTO;
+        }
+        if (glyphMode == null) {
+            glyphMode = ConsoleIO.GlyphMode.UNICODE;
+        }
+        if (musicLevel == null) {
+            musicLevel = MusicLevel.MEDIUM; // backward-compat: old saves lack this field
+        }
+    }
+
+    /** Backward-compatible constructor for callers that don't set music. */
+    public Settings(ConsoleIO.ColorMode colorMode, ConsoleIO.GlyphMode glyphMode) {
+        this(colorMode, glyphMode, MusicLevel.MEDIUM);
+    }
 
     public static Settings defaults() {
-        return new Settings(ConsoleIO.ColorMode.AUTO, ConsoleIO.GlyphMode.UNICODE);
+        return new Settings(ConsoleIO.ColorMode.AUTO, ConsoleIO.GlyphMode.UNICODE, MusicLevel.MEDIUM);
     }
 }

Semesterprojekt/src/main/resources/world/combinations.yaml

@@ -0,0 +1,7 @@
+- a: matches
+  b: torch
+  consume: [matches, torch]
+  produce: lit_torch
+  response: |
+    You strike a match and touch it to the torch; it catches with a low hiss
+    and burns steady. You now hold a lit torch.

Semesterprojekt/src/main/resources/world/items.yaml

@@ -47,3 +47,19 @@
     You ease the door shut again.
   effects:
     - { setFlag: fled }
+
+- type: plain
+  id: matches
+  name: Box of Matches
+  description: A small box of dry matches. They rattle when you shake it.
+
+- type: plain
+  id: torch
+  name: Unlit Torch
+  description: A pitch-soaked torch, waiting for a flame.
+
+- type: plain
+  id: lit_torch
+  name: Lit Torch
+  description: A burning torch, throwing back the dark.
+  light: true

Semesterprojekt/src/main/resources/world/rooms.yaml

@@ -3,6 +3,7 @@
   description: |
     A dusty kitchen. Cobwebs hang from the rafters
     and a letter lies on the table.
+  music: manor-theme.ogg
   exits:
     north: hallway
     east: cellar
@@ -23,7 +24,7 @@
   exits:
     south: kitchen
     west: library
-  items: []
+  items: [torch]
   npcs: []
 
 - id: library
@@ -33,7 +34,7 @@
     An old chest stands in the corner.
   exits:
     east: hallway
-  items: [shovel]
+  items: [shovel, matches]
   npcs: []
 
 - id: cellar
@@ -55,6 +56,7 @@
   name: Dungeon
   description: |
     A cramped stone room, black as pitch. A rusty generator squats in the corner.
+  music: dungeon-drone.ogg
   dark: true
   exits:
     north: kitchen

Semesterprojekt/src/main/resources/world/tutorial.yaml

@@ -0,0 +1,40 @@
+intro: |
+  Welcome to the manor. Let me show you the ropes — just type the commands as
+  I describe them. (Type 'skip' at any time to jump straight into the game.)
+steps:
+  - instruction: "First, look around the room: type 'look'."
+    expect: look
+    confirm: "Good — 'look' (or 'l') re-describes wherever you are."
+    hint: "When you're ready, just type: look"
+  - instruction: "Examine something you noticed: 'examine <thing>' (or 'x <thing>')."
+    expect: examine
+    minArgs: 1
+    confirm: "That's how you inspect items, exits, and people up close."
+    hint: "Try examining something, e.g.: examine lamp"
+  - instruction: "Pick something up: 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Taken. Things you carry go into your inventory."
+    hint: "Pick something up, e.g.: take lamp"
+  - instruction: "Check what you're carrying: 'inventory' (or 'i')."
+    expect: inventory
+    confirm: "That's your inventory."
+    hint: "Type: inventory"
+  - instruction: "Use an item: 'use <item>' — try lighting the lamp."
+    expect: use
+    minArgs: 1
+    confirm: "Some items toggle, read, or react when you use them."
+    hint: "Use something, e.g.: use lamp"
+  - instruction: "Now move to another room: 'go <direction>' (try 'go north')."
+    expect: go_direction
+    confirm: "You can move north / south / east / west between connected rooms."
+    hint: "Head to a connected room, e.g.: go north"
+  - instruction: "Travel back to a room you've already seen: 'go to <room>'."
+    expect: go_to_room
+    confirm: "Nice — 'go to <room>' auto-walks to any room you've already visited."
+    hint: "Try: go to <a room you've already visited>"
+closingTips: |
+  That's the core. A few more you'll want:
+  read · drop · talk to <npc> · give <item> to <npc> ·
+  use <item> on <item> (combine things) · map · quests · save · menu.
+  Type 'help' anytime. Good luck.

Semesterprojekt/src/test/java/thb/jeanluc/adventure/command/impl/GoCommandPathTest.java

@@ -0,0 +1,103 @@
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class GoCommandPathTest {
+
+    /** kitchen --N--> hallway --N--> library (all lit). Optional lock on kitchen->hallway. */
+    private GameContext world(boolean lockHallway, String libraryName) {
+        Room kitchen = new Room("kitchen", "Kitchen", "d");
+        Room hallway = new Room("hallway", "Hallway", "d");
+        Room library = new Room("library", libraryName, "d");
+        kitchen.addExit(Direction.NORTH, hallway);
+        hallway.addExit(Direction.SOUTH, kitchen);
+        hallway.addExit(Direction.NORTH, library);
+        library.addExit(Direction.SOUTH, hallway);
+        if (lockHallway) {
+            kitchen.addExitLock(Direction.NORTH,
+                    new ExitLock(List.of(new Condition(Condition.Type.FLAG, "open")), "It's locked."));
+        }
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        rooms.put("kitchen", kitchen);
+        rooms.put("hallway", hallway);
+        rooms.put("library", library);
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(kitchen, 0);
+        p.getVisitedRoomIds().addAll(List.of("kitchen", "hallway", "library"));
+        return new GameContext(w, p, new TestIO());
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    @Test
+    void goToWalksToVisitedRoomById() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("library");
+        assertThat(out(ctx)).contains("make your way");
+        assertThat(out(ctx)).contains("through the Hallway");
+    }
+
+    @Test
+    void resolvesByRoomName() {
+        // id "library" but type the display name (lower-cased) — still resolves
+        GameContext ctx = world(false, "Grand Library");
+        new GoCommand().execute(ctx, List.of("grand", "library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("library");
+    }
+
+    @Test
+    void unknownPlaceReportsSo() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("dungeon"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("kitchen");
+        assertThat(out(ctx)).contains("don't know any direction or place called 'dungeon'");
+    }
+
+    @Test
+    void alreadyThere() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("kitchen"));
+        assertThat(out(ctx)).contains("already in the Kitchen");
+    }
+
+    @Test
+    void noPassablePathReportsSo() {
+        GameContext ctx = world(true, "Library"); // kitchen->hallway locked, flag unset
+        new GoCommand().execute(ctx, List.of("library"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("kitchen");
+        assertThat(out(ctx)).contains("can't find a way there");
+    }
+
+    @Test
+    void directionalMoveStillWorks() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("north"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("hallway");
+    }
+
+    @Test
+    void adjacentWalkUsesShortSummary() {
+        GameContext ctx = world(false, "Library");
+        new GoCommand().execute(ctx, List.of("hallway"));
+        assertThat(ctx.getPlayer().getCurrentRoom().getId()).isEqualTo("hallway");
+        assertThat(out(ctx)).contains("make your way from the Kitchen to the Hallway");
+        assertThat(out(ctx)).doesNotContain("through");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/command/impl/UseCommandComboTest.java

@@ -0,0 +1,65 @@
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+import thb.jeanluc.adventure.model.item.SwitchableItem;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class UseCommandComboTest {
+
+    private GameContext ctx() {
+        Map<String, Item> items = new LinkedHashMap<>();
+        items.put("matches", PlainItem.builder().id("matches").name("Matches").description("d").light(false).build());
+        items.put("torch", PlainItem.builder().id("torch").name("Torch").description("d").light(false).build());
+        items.put("lit_torch", PlainItem.builder().id("lit_torch").name("Lit Torch").description("d").light(true).build());
+        SwitchableItem lamp = SwitchableItem.builder()
+                .id("lamp").name("Lamp").description("d").light(true)
+                .onText("The lamp glows.").offText("off").state(false).effects(List.of()).build();
+        items.put("lamp", lamp);
+        Combination recipe = new Combination("matches", "torch", List.of(),
+                List.of("matches", "torch"), "lit_torch", List.of(), "You light the torch.", null);
+        Room start = new Room("start", "Start", "d");
+        World w = new World(Map.of("start", start), items, Map.of(), "t", "w",
+                Map.of(), List.of(), Map.of(recipe.key(), recipe));
+        GameContext ctx = new GameContext(w, new Player(start, 0), new TestIO());
+        ctx.getPlayer().addItem(items.get("matches"));
+        ctx.getPlayer().addItem(items.get("torch"));
+        ctx.getPlayer().addItem(lamp);
+        return ctx;
+    }
+
+    @Test
+    void emptyArgsAsksWhat() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of());
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("Use what?");
+    }
+
+    @Test
+    void twoArgsRoutesToCombination() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of("matches", "torch"));
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("light the torch");
+    }
+
+    @Test
+    void oneArgUsesItemDirectly() {
+        GameContext ctx = ctx();
+        new UseCommand().execute(ctx, List.of("lamp"));
+        assertThat(((SwitchableItem) ctx.getWorld().getItems().get("lamp")).isOn()).isTrue();
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("lamp glows");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/CombinationsTest.java

@@ -0,0 +1,155 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Effect;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationsTest {
+
+    private Item plain(String id, boolean light) {
+        return PlainItem.builder().id(id).name(id).description("d").light(light).build();
+    }
+
+    /** World with matches/torch/lit_torch/shovel and the given recipes; player in an empty room. */
+    private GameContext ctx(Combination... recipes) {
+        Map<String, Item> items = new LinkedHashMap<>();
+        items.put("matches", plain("matches", false));
+        items.put("torch", plain("torch", false));
+        items.put("lit_torch", plain("lit_torch", true));
+        items.put("shovel", plain("shovel", false));
+        Map<String, Combination> combos = new HashMap<>();
+        for (Combination c : recipes) {
+            combos.put(c.key(), c);
+        }
+        Room start = new Room("start", "Start", "d");
+        World w = new World(Map.of("start", start), items, Map.of(), "t", "w",
+                Map.of(), List.of(), combos);
+        return new GameContext(w, new Player(start, 0), new TestIO());
+    }
+
+    private void give(GameContext ctx, String id) {
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get(id));
+    }
+
+    private void putInRoom(GameContext ctx, String id) {
+        ctx.getPlayer().getCurrentRoom().addItem(ctx.getWorld().getItems().get(id));
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    private Combination torchRecipe() {
+        return new Combination("matches", "torch", List.of(),
+                List.of("matches", "torch"), "lit_torch", List.of(),
+                "You light the torch.", null);
+    }
+
+    @Test
+    void combinesFromInventory() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getPlayer().hasItem("matches")).isFalse();
+        assertThat(ctx.getPlayer().hasItem("torch")).isFalse();
+        assertThat(out(ctx)).contains("light the torch");
+    }
+
+    @Test
+    void matchIsOrderIndependent() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "torch", "matches");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+    }
+
+    @Test
+    void consumesOperandFromCurrentRoom() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches");
+        putInRoom(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getPlayer().getCurrentRoom().findItem("torch")).isEmpty();
+    }
+
+    @Test
+    void missingOperandReportsNoSuch() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "matches"); // torch absent
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(out(ctx)).contains("no 'torch'");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isFalse();
+    }
+
+    @Test
+    void noRecipeForPairSaysNothingHappens() {
+        GameContext ctx = ctx(torchRecipe());
+        give(ctx, "shovel");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "shovel", "torch");
+        assertThat(out(ctx)).contains("Nothing happens.");
+    }
+
+    @Test
+    void unmetRequiresShowsFailTextAndDoesNotProduce() {
+        Combination gated = new Combination("matches", "torch",
+                List.of(new Condition(Condition.Type.FLAG, "dry")),
+                List.of("matches", "torch"), "lit_torch", List.of(),
+                "It catches.", "The torch is too damp to light.");
+        GameContext ctx = ctx(gated);
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(out(ctx)).contains("too damp");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isFalse();
+        assertThat(ctx.getPlayer().hasItem("matches")).isTrue(); // not consumed
+    }
+
+    @Test
+    void effectsOnlyRecipeAppliesEffectsWithoutProduceOrResponse() {
+        Combination effectsOnly = new Combination("matches", "shovel",
+                java.util.List.of(), java.util.List.of(), null,
+                java.util.List.of(new Effect(Effect.Type.SET_FLAG, "rite_done")),
+                null, null);
+        GameContext ctx = ctx(effectsOnly);
+        give(ctx, "matches");
+        give(ctx, "shovel");
+        Combinations.tryUse(ctx, "matches", "shovel");
+        assertThat(ctx.getState().isSet("rite_done")).isTrue();
+        assertThat(out(ctx)).doesNotContain("null");
+    }
+
+    @Test
+    void metRequiresAppliesEffectsAndProduces() {
+        Combination gated = new Combination("matches", "torch",
+                List.of(new Condition(Condition.Type.FLAG, "dry")),
+                List.of("matches", "torch"), "lit_torch",
+                List.of(new Effect(Effect.Type.SET_FLAG, "torch_lit")),
+                "It catches.", "too damp");
+        GameContext ctx = ctx(gated);
+        ctx.getState().set("dry");
+        give(ctx, "matches");
+        give(ctx, "torch");
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+        assertThat(ctx.getState().isSet("torch_lit")).isTrue();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/GameTutorialTest.java

@@ -0,0 +1,79 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.command.CommandParser;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.impl.LookCommand;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Ending;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class GameTutorialTest {
+
+    @Test
+    void guideBeginsAndAdvancesThenSkipEndsViaLoop() {
+        Room kitchen = new Room("kitchen", "Kitchen", "d");
+        World w = new World(Map.of("kitchen", kitchen), Map.of(), Map.of(), "t", "w");
+        TestIO io = new TestIO();
+        // scripted player input: a matching 'look', then 'skip'; then EOF (null) ends run()
+        io.enqueue("look").enqueue("skip");
+        GameContext ctx = new GameContext(new GameSession(w, new Player(kitchen, 0), "s"), io);
+
+        CommandRegistry registry = new CommandRegistry();
+        registry.register(new LookCommand(), "look", "l");
+
+        Tutorial t = new Tutorial("INTRO",
+                List.of(new TutorialStep("do look", "look", 0, "STEP1-OK", "hint"),
+                        new TutorialStep("do look again", "look", 0, "STEP2-OK", "hint")),
+                "TIPS");
+        Game game = new Game(ctx, registry, new CommandParser());
+        game.setTutorialGuide(new TutorialGuide(t, registry));
+
+        game.run();
+
+        String out = io.allOutput();
+        assertThat(out).contains("INTRO");      // begin printed
+        assertThat(out).contains("STEP1-OK");   // first 'look' advanced step 1
+        assertThat(out).contains("Tutorial skipped"); // 'skip' ended it before step 2 finished
+    }
+
+    @Test
+    void endingsAreSuppressedWhileTutorialActiveAndFireAfter() {
+        Room kitchen = new Room("kitchen", "Kitchen", "d");
+        Ending fled = new Ending("fled", "Fled", false,
+                List.of(new Condition(Condition.Type.FLAG, "fled")), "ENDING-TEXT");
+        World w = new World(Map.of("kitchen", kitchen), Map.of(), Map.of(),
+                "t", "w", Map.of(), List.of(fled));
+        TestIO io = new TestIO();
+        io.enqueue("look"); // completes the 1-step tutorial; then EOF ends run()
+        GameContext ctx = new GameContext(new GameSession(w, new Player(kitchen, 0), "s"), io);
+        ctx.getState().set("fled"); // ending condition already met from the start
+
+        CommandRegistry registry = new CommandRegistry();
+        registry.register(new LookCommand(), "look", "l");
+
+        Tutorial t = new Tutorial("INTRO",
+                List.of(new TutorialStep("do look", "look", 0, "STEP1-OK", "hint")), "TIPS");
+        Game game = new Game(ctx, registry, new CommandParser());
+        game.setTutorialGuide(new TutorialGuide(t, registry));
+
+        game.run();
+
+        String out = io.allOutput();
+        // The 'look' was processed -> the pre-loop ending did NOT stop the game first.
+        assertThat(out).contains("STEP1-OK");
+        // After the tutorial finished, the ending fired.
+        assertThat(out).contains("ENDING-TEXT");
+        assertThat(out.indexOf("STEP1-OK")).isLessThan(out.indexOf("ENDING-TEXT"));
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/PathfinderTest.java

@@ -0,0 +1,88 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.ExitLock;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PathfinderTest {
+
+    private Room room(String id) {
+        return new Room(id, id, "d");
+    }
+
+    private GameContext ctx(Room start, List<Room> all, Set<String> visited) {
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        for (Room r : all) {
+            rooms.put(r.getId(), r);
+        }
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(start, 0);
+        p.getVisitedRoomIds().addAll(visited);
+        return new GameContext(w, p, new TestIO());
+    }
+
+    @Test
+    void findsShortestPathOverVisitedRooms() {
+        Room a = room("a"), b = room("b"), c = room("c");
+        a.addExit(Direction.NORTH, b);
+        b.addExit(Direction.NORTH, c);
+        GameContext ctx = ctx(a, List.of(a, b, c), Set.of("a", "b", "c"));
+        assertThat(Pathfinder.findPath(ctx, c)).containsExactly(b, c);
+    }
+
+    @Test
+    void willNotRouteThroughUnvisitedRoom() {
+        Room a = room("a"), b = room("b"), c = room("c");
+        a.addExit(Direction.NORTH, b);
+        b.addExit(Direction.NORTH, c);
+        GameContext ctx = ctx(a, List.of(a, b, c), Set.of("a", "c")); // b not visited
+        assertThat(Pathfinder.findPath(ctx, c)).isEmpty();
+    }
+
+    @Test
+    void respectsLockedExit() {
+        Room a = room("a"), b = room("b");
+        a.addExit(Direction.NORTH, b);
+        a.addExitLock(Direction.NORTH,
+                new ExitLock(List.of(new Condition(Condition.Type.FLAG, "open")), "locked"));
+        GameContext ctx = ctx(a, List.of(a, b), Set.of("a", "b"));
+        assertThat(Pathfinder.findPath(ctx, b)).isEmpty();
+        ctx.getState().set("open");
+        assertThat(Pathfinder.findPath(ctx, b)).containsExactly(b);
+    }
+
+    @Test
+    void respectsDarkness() {
+        Room a = room("a");
+        Room dark = room("dark");
+        dark.setDark(true);
+        a.addExit(Direction.NORTH, dark);
+        GameContext ctx = ctx(a, List.of(a, dark), Set.of("a", "dark"));
+        assertThat(Pathfinder.findPath(ctx, dark)).isEmpty();
+        Item torch = PlainItem.builder().id("lit").name("Lit").description("d").light(true).build();
+        ctx.getPlayer().addItem(torch);
+        assertThat(Pathfinder.findPath(ctx, dark)).containsExactly(dark);
+    }
+
+    @Test
+    void unreachableTargetReturnsEmpty() {
+        Room a = room("a");
+        Room island = room("island"); // no connecting exits
+        GameContext ctx = ctx(a, List.of(a, island), Set.of("a", "island"));
+        assertThat(Pathfinder.findPath(ctx, island)).isEmpty();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/TutorialGuideTest.java

@@ -0,0 +1,166 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.command.CommandParser;
+import thb.jeanluc.adventure.command.CommandRegistry;
+import thb.jeanluc.adventure.command.ParsedCommand;
+import thb.jeanluc.adventure.command.impl.ExamineCommand;
+import thb.jeanluc.adventure.command.impl.GoCommand;
+import thb.jeanluc.adventure.command.impl.InventoryCommand;
+import thb.jeanluc.adventure.command.impl.LookCommand;
+import thb.jeanluc.adventure.command.impl.TakeCommand;
+import thb.jeanluc.adventure.command.impl.UseCommand;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.Tutorial;
+import thb.jeanluc.adventure.model.TutorialStep;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TutorialGuideTest {
+
+    private CommandRegistry registry() {
+        CommandRegistry r = new CommandRegistry();
+        r.register(new LookCommand(), "look", "l");
+        r.register(new ExamineCommand(), "examine", "x");
+        r.register(new TakeCommand(), "take", "get");
+        r.register(new InventoryCommand(), "inventory", "i");
+        r.register(new UseCommand(), "use");
+        r.register(new GoCommand(), "go", "move", "walk");
+        return r;
+    }
+
+    private final Room kitchen = new Room("kitchen", "Kitchen", "d");
+    private final Room hallway = new Room("hallway", "Hallway", "d");
+
+    private GameContext ctx() {
+        kitchen.addExit(Direction.NORTH, hallway);
+        Map<String, Room> rooms = new LinkedHashMap<>();
+        rooms.put("kitchen", kitchen);
+        rooms.put("hallway", hallway);
+        World w = new World(rooms, Map.of(), Map.of(), "t", "w");
+        Player p = new Player(kitchen, 0);
+        return new GameContext(w, p, new TestIO());
+    }
+
+    private ParsedCommand parse(String s) {
+        return new CommandParser().parse(s);
+    }
+
+    private String out(GameContext ctx) {
+        return ((TestIO) ctx.getIo()).allOutput();
+    }
+
+    private TutorialStep step(String instr, String expect, int minArgs) {
+        return new TutorialStep(instr, expect, minArgs, "OK:" + expect, "HINT:" + expect);
+    }
+
+    @Test
+    void beginPrintsIntroAndFirstInstruction() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("INTRO", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        assertThat(out(ctx)).contains("INTRO").contains("do look");
+        assertThat(g.isActive()).isTrue();
+    }
+
+    @Test
+    void aliasSatisfiesVerbStepAndAdvancesToTips() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("INTRO", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("l")); // alias of look
+        assertThat(out(ctx)).contains("OK:look").contains("TIPS");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void minArgsGatesTakeStep() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("take it", "take", 1)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("take")); // no arg -> hint, not satisfied
+        assertThat(out(ctx)).contains("HINT:take");
+        assertThat(g.isActive()).isTrue();
+        g.onCommand(ctx, parse("take lamp")); // satisfied
+        assertThat(out(ctx)).contains("OK:take");
+    }
+
+    @Test
+    void goDirectionRequiresAnActualMove() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("move", "go_direction", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        // typed a direction but did NOT move -> hint
+        g.onCommand(ctx, parse("go north"));
+        assertThat(out(ctx)).contains("HINT:go_direction");
+        assertThat(g.isActive()).isTrue();
+        // now actually move, then the same command satisfies
+        ctx.getPlayer().setCurrentRoom(hallway);
+        g.onCommand(ctx, parse("go north"));
+        assertThat(out(ctx)).contains("OK:go_direction");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void goToRoomNeedsNonDirectionArgAndMove() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("travel", "go_to_room", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        ctx.getPlayer().setCurrentRoom(hallway); // moved
+        g.onCommand(ctx, parse("go kitchen")); // "kitchen" is not a direction
+        assertThat(out(ctx)).contains("OK:go_to_room");
+    }
+
+    @Test
+    void skipDeactivates() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("do look", "look", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.skip(ctx);
+        assertThat(out(ctx)).contains("Tutorial skipped");
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void emptyTutorialIsInactive() {
+        TutorialGuide g = new TutorialGuide(Tutorial.none(), registry());
+        assertThat(g.isActive()).isFalse();
+    }
+
+    @Test
+    void advancingPrintsTheNextInstruction() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I",
+                List.of(step("do look", "look", 0), step("do take", "take", 1)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("look"));
+        assertThat(out(ctx)).contains("OK:look").contains("do take");
+        assertThat(g.isActive()).isTrue();
+    }
+
+    @Test
+    void goToRoomWithoutMovingGivesHint() {
+        GameContext ctx = ctx();
+        Tutorial t = new Tutorial("I", List.of(step("travel", "go_to_room", 0)), "TIPS");
+        TutorialGuide g = new TutorialGuide(t, registry());
+        g.begin(ctx);
+        g.onCommand(ctx, parse("go kitchen")); // non-direction arg but no room change
+        assertThat(out(ctx)).contains("HINT:go_to_room");
+        assertThat(g.isActive()).isTrue();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/MusicControllerTest.java

@@ -0,0 +1,106 @@
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicControllerTest {
+
+    /** Records backend calls for assertions. */
+    private static final class FakeBackend implements MusicBackend {
+        final List<String> calls = new ArrayList<>();
+        float lastGain = Float.NaN;
+        public void fadeTo(String track, float gainDb) { calls.add("fadeTo:" + track); lastGain = gainDb; }
+        public void fadeOut() { calls.add("fadeOut"); }
+        public void setGainDb(float gainDb) { calls.add("setGain:" + gainDb); }
+        public void shutdown() { calls.add("shutdown"); }
+    }
+
+    @Test
+    void firstRoomWithTrackPlaysAtDefaultLevel() {
+        FakeBackend b = new FakeBackend();
+        new MusicController(b).room("a");
+        assertThat(b.calls).containsExactly("fadeTo:a");
+    }
+
+    @Test
+    void sameTrackDoesNotRestart() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        b.calls.clear();
+        c.room("a");
+        assertThat(b.calls).isEmpty();
+    }
+
+    @Test
+    void differentTrackSwitches() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.room("b");
+        assertThat(b.calls).containsExactly("fadeTo:a", "fadeTo:b");
+    }
+
+    @Test
+    void nullOrBlankRoomFadesToSilence() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.room(null);
+        c.room("  ");
+        assertThat(b.calls).containsExactly("fadeTo:a", "fadeOut");
+    }
+
+    @Test
+    void offStopsAndIgnoresRooms() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.level(MusicLevel.OFF);
+        b.calls.clear();
+        c.room("b");
+        assertThat(b.calls).isEmpty();
+    }
+
+    @Test
+    void levelChangeSetsGain() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b); // default MEDIUM
+        c.level(MusicLevel.HIGH);
+        assertThat(b.calls).containsExactly("setGain:" + MusicLevel.HIGH.gainDb());
+    }
+
+    @Test
+    void turningOffThenOnReplaysOnNextRoom() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        c.level(MusicLevel.OFF);   // fadeOut
+        c.level(MusicLevel.MEDIUM); // setGain
+        b.calls.clear();
+        c.room("a");               // current was reset → plays again
+        assertThat(b.calls).containsExactly("fadeTo:a");
+    }
+
+    @Test
+    void forwardsTheCurrentLevelGain() {
+        FakeBackend b = new FakeBackend();
+        MusicController c = new MusicController(b);
+        c.room("a");
+        assertThat(b.lastGain).isEqualTo(MusicLevel.MEDIUM.gainDb());
+        c.level(MusicLevel.HIGH);
+        c.room("b");
+        assertThat(b.lastGain).isEqualTo(MusicLevel.HIGH.gainDb());
+    }
+
+    @Test
+    void shutdownDelegatesToBackend() {
+        FakeBackend b = new FakeBackend();
+        new MusicController(b).shutdown();
+        assertThat(b.calls).containsExactly("shutdown");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/MusicLevelTest.java

@@ -0,0 +1,30 @@
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicLevelTest {
+
+    @Test
+    void gainIncreasesWithLevel() {
+        assertThat(MusicLevel.LOW.gainDb()).isLessThan(MusicLevel.MEDIUM.gainDb());
+        assertThat(MusicLevel.MEDIUM.gainDb()).isLessThan(MusicLevel.HIGH.gainDb());
+    }
+
+    @Test
+    void isOnOnlyWhenNotOff() {
+        assertThat(MusicLevel.OFF.isOn()).isFalse();
+        assertThat(MusicLevel.LOW.isOn()).isTrue();
+        assertThat(MusicLevel.MEDIUM.isOn()).isTrue();
+        assertThat(MusicLevel.HIGH.isOn()).isTrue();
+    }
+
+    @Test
+    void nextCyclesThroughAllAndWraps() {
+        assertThat(MusicLevel.OFF.next()).isEqualTo(MusicLevel.LOW);
+        assertThat(MusicLevel.LOW.next()).isEqualTo(MusicLevel.MEDIUM);
+        assertThat(MusicLevel.MEDIUM.next()).isEqualTo(MusicLevel.HIGH);
+        assertThat(MusicLevel.HIGH.next()).isEqualTo(MusicLevel.OFF);
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/MusicSeamDefaultTest.java

@@ -0,0 +1,17 @@
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MusicSeamDefaultTest {
+
+    @Test
+    void defaultMusicSeamsAreSilentNoOps() {
+        TestIO io = new TestIO();
+        io.setMusic("anything.ogg");
+        io.setMusic(null);
+        io.setMusicLevel(MusicLevel.HIGH);
+        assertThat(io.outputs()).isEmpty();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/TravelStepDefaultTest.java

@@ -0,0 +1,19 @@
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.text.MapView;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TravelStepDefaultTest {
+
+    @Test
+    void defaultTravelStepIsSilentNoOp() {
+        TestIO io = new TestIO();
+        // An empty map view is fine; the default must not print or throw.
+        io.travelStep(new MapView(List.of(), List.of()));
+        assertThat(io.outputs()).isEmpty();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/loader/CombinationFactoryTest.java

@@ -0,0 +1,69 @@
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.loader.dto.CombinationDto;
+import thb.jeanluc.adventure.model.Combination;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class CombinationFactoryTest {
+
+    private Map<String, Item> items() {
+        Map<String, Item> m = new HashMap<>();
+        for (String id : List.of("matches", "torch", "lit_torch")) {
+            m.put(id, PlainItem.builder().id(id).name(id).description("d").light(false).build());
+        }
+        return m;
+    }
+
+    @Test
+    void buildsCombinationFromDto() {
+        CombinationDto dto = new CombinationDto("matches", "torch", null,
+                List.of("matches", "torch"), "lit_torch", null, "You light it.", null);
+        Combination c = CombinationFactory.fromDto(dto, items());
+        assertThat(c.key()).isEqualTo("matches|torch");
+        assertThat(c.consume()).containsExactly("matches", "torch");
+        assertThat(c.produce()).isEqualTo("lit_torch");
+        assertThat(c.response()).isEqualTo("You light it.");
+    }
+
+    @Test
+    void rejectsUnknownOperandId() {
+        CombinationDto dto = new CombinationDto("matches", "ghost", null, null, null, null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("ghost");
+    }
+
+    @Test
+    void rejectsUnknownProduceId() {
+        CombinationDto dto = new CombinationDto("matches", "torch", null, null, "phantom", null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("phantom");
+    }
+
+    @Test
+    void rejectsUnknownConsumeId() {
+        CombinationDto dto = new CombinationDto("matches", "torch", null,
+                List.of("matches", "wraith"), null, null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("wraith");
+    }
+
+    @Test
+    void rejectsSelfCombination() {
+        CombinationDto dto = new CombinationDto("torch", "torch", null, null, null, null, "x", null);
+        assertThatThrownBy(() -> CombinationFactory.fromDto(dto, items()))
+                .isInstanceOf(WorldLoadException.class)
+                .hasMessageContaining("itself");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/loader/CombinationLoadingTest.java

@@ -0,0 +1,33 @@
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.Combinations;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.GameSession;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Combination;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationLoadingTest {
+
+    @Test
+    void realWorldLoadsTheTorchRecipe() {
+        WorldLoader.LoadResult loaded = new WorldLoader().load();
+        assertThat(loaded.world().getCombinations())
+                .containsKey(Combination.key("matches", "torch"));
+        assertThat(loaded.world().getItems()).containsKeys("matches", "torch", "lit_torch");
+    }
+
+    @Test
+    void torchRecipeWorksEndToEnd() {
+        WorldLoader.LoadResult loaded = new WorldLoader().load();
+        GameContext ctx = new GameContext(
+                new GameSession(loaded.world(), loaded.player(), "test"), new TestIO());
+        // grab the demo items straight from the registry, regardless of room
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get("matches"));
+        ctx.getPlayer().addItem(ctx.getWorld().getItems().get("torch"));
+        Combinations.tryUse(ctx, "matches", "torch");
+        assertThat(ctx.getPlayer().hasItem("lit_torch")).isTrue();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/loader/RoomMusicTest.java

@@ -0,0 +1,28 @@
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.loader.dto.RoomDto;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class RoomMusicTest {
+
+    @Test
+    void musicFieldIsCarriedOntoRoom() {
+        RoomDto dto = new RoomDto("r", "Room", "d",
+                Map.of(), List.of(), List.of(), null, null, null, "theme.ogg");
+        Room room = RoomFactory.shellFromDto(dto);
+        assertThat(room.getMusic()).isEqualTo("theme.ogg");
+    }
+
+    @Test
+    void absentMusicIsNull() {
+        RoomDto dto = new RoomDto("r", "Room", "d", Map.of(), List.of(), List.of());
+        Room room = RoomFactory.shellFromDto(dto);
+        assertThat(room.getMusic()).isNull();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/loader/TutorialLoaderTest.java

@@ -0,0 +1,35 @@
+package thb.jeanluc.adventure.loader;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.model.Tutorial;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class TutorialLoaderTest {
+
+    @Test
+    void loadsTheTestFixture() {
+        Tutorial t = new TutorialLoader().load(); // test-classpath /world/tutorial.yaml shadows prod
+        assertThat(t.isEmpty()).isFalse();
+        assertThat(t.intro()).isNotBlank();
+        assertThat(t.closingTips()).isNotBlank();
+        assertThat(t.steps()).hasSize(2);
+        assertThat(t.steps().getFirst().expect()).isEqualTo("look");
+        assertThat(t.steps().getFirst().minArgs()).isZero();
+    }
+
+    @Test
+    void missingFileReturnsEmptyTutorial() {
+        Tutorial t = new TutorialLoader("/no-such-base").load();
+        assertThat(t.isEmpty()).isTrue();
+        assertThat(t.steps()).isEmpty();
+    }
+
+    @Test
+    void malformedFileThrowsWorldLoadException() {
+        // /badtut/tutorial.yaml has 'steps: 12345' (scalar where a list is required)
+        assertThatThrownBy(() -> new TutorialLoader("/badtut").load())
+                .isInstanceOf(WorldLoadException.class);
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/loader/WorldLoaderTest.java

@@ -14,7 +14,8 @@ class WorldLoaderTest {
 
         assertThat(result.world().getTitle()).isEqualTo("Test Manor");
         assertThat(result.world().getRooms().keySet()).containsExactlyInAnyOrder("kitchen", "hallway");
-        assertThat(result.world().getItems().keySet()).containsExactlyInAnyOrder("letter", "lamp", "key");
+        assertThat(result.world().getItems().keySet())
+                .containsExactlyInAnyOrder("letter", "lamp", "key", "matches", "torch", "lit_torch");
         assertThat(result.world().getNpcs().keySet()).containsExactly("old_man");
 
         assertThat(result.player().getCurrentRoom().getId()).isEqualTo("kitchen");

Semesterprojekt/src/test/java/thb/jeanluc/adventure/menu/MenuTest.java

@@ -10,6 +10,7 @@ import thb.jeanluc.adventure.save.SaveSlotInfo;
 import thb.jeanluc.adventure.save.Settings;
 import thb.jeanluc.adventure.save.SettingsStore;
 import thb.jeanluc.adventure.io.ConsoleIO;
+import thb.jeanluc.adventure.io.MusicLevel;
 
 import java.nio.file.Path;
 
@@ -64,11 +65,18 @@ class MenuTest {
     @Test
     void settingsMenuTogglesGlyphAndPersists(@TempDir Path dir) {
         SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
-        // choose "Glyph mode" (assume option 2) → its toggle, then "Back" (last)
-        TestIO io = new TestIO().enqueue("2").enqueue("3");
-        Settings result = SettingsMenu.show(io, Settings.defaults(), store, new ConsoleIO());
-        // UNICODE default toggles to ASCII; persisted
+        TestIO io = new TestIO().enqueue("2").enqueue("4"); // toggle Glyphs, then Back
+        Settings result = SettingsMenu.show(io, Settings.defaults(), store);
         assertThat(result.glyphMode()).isEqualTo(ConsoleIO.GlyphMode.ASCII);
         assertThat(store.load().glyphMode()).isEqualTo(ConsoleIO.GlyphMode.ASCII);
     }
+
+    @Test
+    void settingsMenuCyclesMusicLevelAndPersists(@TempDir Path dir) {
+        SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
+        TestIO io = new TestIO().enqueue("3").enqueue("4"); // cycle Music once, then Back
+        Settings result = SettingsMenu.show(io, Settings.defaults(), store);
+        assertThat(result.musicLevel()).isEqualTo(MusicLevel.MEDIUM.next()); // HIGH
+        assertThat(store.load().musicLevel()).isEqualTo(MusicLevel.MEDIUM.next());
+    }
 }

Semesterprojekt/src/test/java/thb/jeanluc/adventure/model/CombinationTest.java

@@ -0,0 +1,26 @@
+package thb.jeanluc.adventure.model;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CombinationTest {
+
+    @Test
+    void keyIsOrderIndependentAndSorted() {
+        assertThat(Combination.key("matches", "torch"))
+                .isEqualTo(Combination.key("torch", "matches"))
+                .isEqualTo("matches|torch");
+        assertThat(Combination.key("b", "a")).isEqualTo("a|b");
+    }
+
+    @Test
+    void nullCollectionComponentsBecomeEmpty() {
+        Combination c = new Combination("a", "b", null, null, null, null, "ok", null);
+        assertThat(c.requires()).isEmpty();
+        assertThat(c.consume()).isEmpty();
+        assertThat(c.effects()).isEmpty();
+        assertThat(c.produce()).isNull();
+        assertThat(c.key()).isEqualTo("a|b");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/model/WorldCombinationsTest.java

@@ -0,0 +1,29 @@
+package thb.jeanluc.adventure.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class WorldCombinationsTest {
+
+    @Test
+    void legacyConstructorsDefaultToEmptyCombinations() {
+        World w5 = new World(Map.of(), Map.of(), Map.of(), "t", "w");
+        World w6 = new World(Map.of(), Map.of(), Map.of(), "t", "w", Map.of());
+        World w7 = new World(Map.of(), Map.of(), Map.of(), "t", "w", Map.of(), List.of());
+        assertThat(w5.getCombinations()).isEmpty();
+        assertThat(w6.getCombinations()).isEmpty();
+        assertThat(w7.getCombinations()).isEmpty();
+    }
+
+    @Test
+    void fullConstructorStoresCombinations() {
+        Combination c = new Combination("a", "b", List.of(), List.of(), null, List.of(), "r", null);
+        World w = new World(Map.of(), Map.of(), Map.of(), "t", "w",
+                Map.of(), List.of(), Map.of(c.key(), c));
+        assertThat(w.getCombinations()).containsKey("a|b");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/save/SettingsStoreTest.java

@@ -3,6 +3,7 @@ package thb.jeanluc.adventure.save;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 import thb.jeanluc.adventure.io.ConsoleIO;
+import thb.jeanluc.adventure.io.MusicLevel;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -19,6 +20,7 @@ class SettingsStoreTest {
         Settings loaded = store.load();
         assertThat(loaded.colorMode()).isEqualTo(ConsoleIO.ColorMode.ON);
         assertThat(loaded.glyphMode()).isEqualTo(ConsoleIO.GlyphMode.ASCII);
+        assertThat(loaded.musicLevel()).isEqualTo(MusicLevel.MEDIUM);
     }
 
     @Test
@@ -34,4 +36,18 @@ class SettingsStoreTest {
         Settings loaded = new SettingsStore(file).load();
         assertThat(loaded).isEqualTo(Settings.defaults());
     }
+
+    @Test
+    void musicLevelRoundTrips(@TempDir Path dir) {
+        SettingsStore store = new SettingsStore(dir.resolve("settings.json"));
+        store.save(new Settings(ConsoleIO.ColorMode.AUTO, ConsoleIO.GlyphMode.UNICODE, MusicLevel.HIGH));
+        assertThat(store.load().musicLevel()).isEqualTo(MusicLevel.HIGH);
+    }
+
+    @Test
+    void oldSettingsWithoutMusicDefaultToMedium(@TempDir Path dir) throws Exception {
+        Path file = dir.resolve("settings.json");
+        Files.writeString(file, "{\"colorMode\":\"ON\",\"glyphMode\":\"ASCII\"}");
+        assertThat(new SettingsStore(file).load().musicLevel()).isEqualTo(MusicLevel.MEDIUM);
+    }
 }

Semesterprojekt/src/test/resources/badtut/tutorial.yaml

@@ -0,0 +1,5 @@
+# Malformed on purpose: 'steps' must be a list, not a scalar.
+# Used by TutorialLoaderTest to verify parse errors become WorldLoadException.
+intro: "bad"
+steps: 12345
+closingTips: "bad"

Semesterprojekt/src/test/resources/world/combinations.yaml

@@ -0,0 +1,7 @@
+- a: matches
+  b: torch
+  consume: [matches, torch]
+  produce: lit_torch
+  response: |
+    You strike a match and touch it to the torch; it catches with a low hiss
+    and burns steady. You now hold a lit torch.

Semesterprojekt/src/test/resources/world/items.yaml

@@ -17,3 +17,19 @@
   id: key
   name: Key
   description: A key.
+
+- type: plain
+  id: matches
+  name: Box of Matches
+  description: A small box of dry matches.
+
+- type: plain
+  id: torch
+  name: Unlit Torch
+  description: A pitch-soaked torch.
+
+- type: plain
+  id: lit_torch
+  name: Lit Torch
+  description: A burning torch.
+  light: true

Semesterprojekt/src/test/resources/world/tutorial.yaml

@@ -0,0 +1,14 @@
+intro: |
+  Test intro.
+steps:
+  - instruction: "Look: type 'look'."
+    expect: look
+    confirm: "Looked."
+    hint: "Type look."
+  - instruction: "Take: type 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Took it."
+    hint: "Take something."
+closingTips: |
+  Test tips.