diff --git a/game/.nvmrc b/game/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/game/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/game/README.md b/game/README.md
new file mode 100644
index 0000000..20bd3e7
--- /dev/null
+++ b/game/README.md
@@ -0,0 +1,29 @@
+# Game
+
+Use **Node 22** (`nvm use` reads `.nvmrc`). From this folder:
+
+```bash
+npm ci
+npm run dev
+npm run typecheck
+npm test
+npm run build
+npm run preview
+```
+
+Open the local URL printed by Vite. The empty 1280×720 stage starts through
+Boot → Preload → Stage, with UI running over Stage. The canvas uses whole-number
+display scaling whenever the window can hold the native view; smaller windows
+fit the entire view. Production output is `dist/`.
+
+Bootstrap scenes are in `src/core/scaffold.ts` so they do not occupy lane A's
+`src/scenes/` or `src/ui/`. Integration can replace them with the story scenes.
+Subscribe to `gameEvents` from `src/core/events.ts`; keep the returned unsubscribe
+function and call it on scene shutdown.
+
+`public/assets/placeholder/` contains plain coloured rectangles, loaded as Phaser
+JSON-hash atlases with `idle-00` frames and feet pivots `(0.5, 1)`, plus matching
+`.anims.json` files. Hero: 28×76 body in an 80 px frame; Dexter: 20 px;
+rover: 25 px; crab: 40 px; drone: 45 px; Jenny: 200×70.
+They are development stand-ins for the [production contracts](../docs/13-PRODUCTION-PIPELINE.md),
+and are never copied to `art/`. No gameplay, HUD, or collision is included yet.
diff --git a/game/index.html b/game/index.html
new file mode 100644
index 0000000..80ff041
--- /dev/null
+++ b/game/index.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>DEGGSTER.EXE</title>
+  </head>
+  <body>
+    <div id="game" aria-label="DEGGSTER.EXE game"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/game/package-lock.json b/game/package-lock.json
new file mode 100644
index 0000000..ebfb29f
--- /dev/null
+++ b/game/package-lock.json
@@ -0,0 +1,1150 @@
+{
+  "name": "wincs-game",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "wincs-game",
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+      },
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+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "5.0.5",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-5.0.5.tgz",
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+        "@vitest/mocker": "5.0.5",
+        "chai": "^6.3.0",
+        "es-module-lexer": "^2.3.2",
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+      },
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+        "vitest": "vitest.mjs"
+      },
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+        "url": "https://opencollective.com/vitest"
+      },
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+        "@vitest/browser-webdriverio": "^5.0.0-beta.5 || >=5.0.0",
+        "@vitest/coverage-istanbul": "5.0.5",
+        "@vitest/coverage-v8": "5.0.5",
+        "@vitest/ui": "5.0.5",
+        "happy-dom": "*",
+        "jsdom": "*",
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+        },
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+        },
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+        },
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+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-3.2.1.tgz",
+      "integrity": "sha512-Tb2FUhB4vUsGQlfSquQLYkApkuPAFQXGFzxWKHHumVz2dK+X1RUm/HnID4+TfIGYJ1kTcwOaCk/buYCEJr6YjQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=20.11"
+      }
+    }
+  }
+}
diff --git a/game/package.json b/game/package.json
new file mode 100644
index 0000000..efba0b1
--- /dev/null
+++ b/game/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "wincs-game",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "engines": { "node": ">=22.12 <23" },
+  "scripts": {
+    "dev": "vite --host 127.0.0.1",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview --host 127.0.0.1"
+  },
+  "dependencies": { "phaser": "3.90.0" },
+  "devDependencies": {
+    "typescript": "~5.9.3",
+    "vite": "^8.3.5",
+    "vitest": "^5.0.5"
+  }
+}
diff --git a/game/public/assets/placeholder/crab.anims.json b/game/public/assets/placeholder/crab.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/crab.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/crab.json b/game/public/assets/placeholder/crab.json
new file mode 100644
index 0000000..423ce93
--- /dev/null
+++ b/game/public/assets/placeholder/crab.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 40,
+        "h": 40
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 40,
+        "h": 40
+      },
+      "sourceSize": {
+        "w": 40,
+        "h": 40
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "crab.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 40,
+      "h": 40
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/crab.png b/game/public/assets/placeholder/crab.png
new file mode 100644
index 0000000..adfbbfd
Binary files /dev/null and b/game/public/assets/placeholder/crab.png differ
diff --git a/game/public/assets/placeholder/dexter.anims.json b/game/public/assets/placeholder/dexter.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/dexter.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/dexter.json b/game/public/assets/placeholder/dexter.json
new file mode 100644
index 0000000..d67340e
--- /dev/null
+++ b/game/public/assets/placeholder/dexter.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 20,
+        "h": 20
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 20,
+        "h": 20
+      },
+      "sourceSize": {
+        "w": 20,
+        "h": 20
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "dexter.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 20,
+      "h": 20
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/dexter.png b/game/public/assets/placeholder/dexter.png
new file mode 100644
index 0000000..7768469
Binary files /dev/null and b/game/public/assets/placeholder/dexter.png differ
diff --git a/game/public/assets/placeholder/drone.anims.json b/game/public/assets/placeholder/drone.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/drone.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/drone.json b/game/public/assets/placeholder/drone.json
new file mode 100644
index 0000000..c5828d9
--- /dev/null
+++ b/game/public/assets/placeholder/drone.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 45,
+        "h": 45
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 45,
+        "h": 45
+      },
+      "sourceSize": {
+        "w": 45,
+        "h": 45
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "drone.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 45,
+      "h": 45
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/drone.png b/game/public/assets/placeholder/drone.png
new file mode 100644
index 0000000..e3386fa
Binary files /dev/null and b/game/public/assets/placeholder/drone.png differ
diff --git a/game/public/assets/placeholder/hero.anims.json b/game/public/assets/placeholder/hero.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/hero.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/hero.json b/game/public/assets/placeholder/hero.json
new file mode 100644
index 0000000..ee33418
--- /dev/null
+++ b/game/public/assets/placeholder/hero.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 28,
+        "h": 80
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 28,
+        "h": 80
+      },
+      "sourceSize": {
+        "w": 28,
+        "h": 80
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "hero.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 28,
+      "h": 80
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/hero.png b/game/public/assets/placeholder/hero.png
new file mode 100644
index 0000000..5f8c2a1
Binary files /dev/null and b/game/public/assets/placeholder/hero.png differ
diff --git a/game/public/assets/placeholder/jenny.anims.json b/game/public/assets/placeholder/jenny.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/jenny.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/jenny.json b/game/public/assets/placeholder/jenny.json
new file mode 100644
index 0000000..d4a7321
--- /dev/null
+++ b/game/public/assets/placeholder/jenny.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 200,
+        "h": 70
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 200,
+        "h": 70
+      },
+      "sourceSize": {
+        "w": 200,
+        "h": 70
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "jenny.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 200,
+      "h": 70
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/jenny.png b/game/public/assets/placeholder/jenny.png
new file mode 100644
index 0000000..632baf3
Binary files /dev/null and b/game/public/assets/placeholder/jenny.png differ
diff --git a/game/public/assets/placeholder/rover.anims.json b/game/public/assets/placeholder/rover.anims.json
new file mode 100644
index 0000000..4912cc9
--- /dev/null
+++ b/game/public/assets/placeholder/rover.anims.json
@@ -0,0 +1,7 @@
+{
+  "idle": {
+    "frames": 1,
+    "fps": 12,
+    "loop": true
+  }
+}
diff --git a/game/public/assets/placeholder/rover.json b/game/public/assets/placeholder/rover.json
new file mode 100644
index 0000000..b26e672
--- /dev/null
+++ b/game/public/assets/placeholder/rover.json
@@ -0,0 +1,37 @@
+{
+  "frames": {
+    "idle-00": {
+      "frame": {
+        "x": 0,
+        "y": 0,
+        "w": 25,
+        "h": 25
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 25,
+        "h": 25
+      },
+      "sourceSize": {
+        "w": 25,
+        "h": 25
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 1
+      }
+    }
+  },
+  "meta": {
+    "image": "rover.png",
+    "format": "RGBA8888",
+    "size": {
+      "w": 25,
+      "h": 25
+    },
+    "scale": "1"
+  }
+}
diff --git a/game/public/assets/placeholder/rover.png b/game/public/assets/placeholder/rover.png
new file mode 100644
index 0000000..f174cb4
Binary files /dev/null and b/game/public/assets/placeholder/rover.png differ
diff --git a/game/src/core/events.test.ts b/game/src/core/events.test.ts
new file mode 100644
index 0000000..11c672f
--- /dev/null
+++ b/game/src/core/events.test.ts
@@ -0,0 +1,17 @@
+import { expect, it } from 'vitest';
+import { GameEventBus } from './events';
+
+it('isolates events and releases subscribers on scene shutdown', () => {
+  const bus = new GameEventBus();
+  const seen: number[] = [];
+  const stop = bus.on('player-hit', ({ health }) => seen.push(health));
+  bus.emit('player-died', { position: { x: 0, y: 0 } });
+  bus.emit('player-hit', { health: 4, damage: 1, position: { x: 0, y: 0 } });
+  stop();
+  bus.emit('player-hit', { health: 3, damage: 1, position: { x: 0, y: 0 } });
+  expect(seen).toEqual([4]);
+  bus.on('player-hit', ({ health }) => seen.push(health));
+  bus.clear();
+  bus.emit('player-hit', { health: 2, damage: 1, position: { x: 0, y: 0 } });
+  expect(seen).toEqual([4]);
+});
diff --git a/game/src/core/events.ts b/game/src/core/events.ts
new file mode 100644
index 0000000..d5764b5
--- /dev/null
+++ b/game/src/core/events.ts
@@ -0,0 +1,38 @@
+export type RegionState = 'clean' | 'anomaly';
+export interface Position { x: number; y: number }
+
+/** Shared system → story/UI notifications; coordinates are stage pixels. */
+export interface GameEvents {
+  'enemy-defeated': { id: string; kind: string; position: Position };
+  'player-hit': { health: number; damage: number; position: Position };
+  'player-died': { position: Position };
+  'region-turned': { region: string; state: RegionState };
+  'boss-defeated': { id: string; position: Position };
+  'save': { checkpoint: string; region: string; position: Position };
+}
+
+type Listener<T> = (payload: T) => void;
+
+export class GameEventBus {
+  private listeners = new Map<keyof GameEvents, Set<Listener<never>>>();
+
+  on<K extends keyof GameEvents>(event: K, listener: Listener<GameEvents[K]>): () => void {
+    const listeners = this.listeners.get(event) ?? new Set<Listener<never>>();
+    listeners.add(listener);
+    this.listeners.set(event, listeners);
+    return () => this.off(event, listener);
+  }
+
+  off<K extends keyof GameEvents>(event: K, listener: Listener<GameEvents[K]>): void {
+    this.listeners.get(event)?.delete(listener);
+  }
+
+  emit<K extends keyof GameEvents>(event: K, payload: GameEvents[K]): void {
+    // Registration enforces the key/payload pairing; storage erases only that type.
+    for (const listener of [...(this.listeners.get(event) ?? [])]) listener(payload as never);
+  }
+
+  clear(): void { this.listeners.clear(); }
+}
+
+export const gameEvents = new GameEventBus();
diff --git a/game/src/core/scaffold.ts b/game/src/core/scaffold.ts
new file mode 100644
index 0000000..45e1996
--- /dev/null
+++ b/game/src/core/scaffold.ts
@@ -0,0 +1,30 @@
+import Phaser from 'phaser';
+
+export const PLACEHOLDERS = ['hero', 'dexter', 'rover', 'crab', 'drone', 'jenny'] as const;
+
+// Bootstrap-only scenes live in lane B until lane A provides story/UI scenes.
+export class Boot extends Phaser.Scene {
+  constructor() { super('Boot'); }
+  create() { this.scene.start('Preload'); }
+}
+
+export class Preload extends Phaser.Scene {
+  constructor() { super('Preload'); }
+  preload() {
+    for (const board of PLACEHOLDERS) {
+      const path = `/assets/placeholder/${board}`;
+      this.load.atlas(board, `${path}.png`, `${path}.json`);
+      this.load.json(`${board}.anims`, `${path}.anims.json`);
+    }
+  }
+  create() { this.scene.start('Stage'); }
+}
+
+export class Stage extends Phaser.Scene {
+  constructor() { super('Stage'); }
+  create() { this.scene.launch('UI'); }
+}
+
+export class UI extends Phaser.Scene {
+  constructor() { super('UI'); }
+}
diff --git a/game/src/core/viewport.test.ts b/game/src/core/viewport.test.ts
new file mode 100644
index 0000000..c40ebdd
--- /dev/null
+++ b/game/src/core/viewport.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, it } from 'vitest';
+import { displayScale } from './viewport';
+
+describe('canvas display scaling', () => {
+  it('uses the largest whole multiplier that fits both dimensions', () => {
+    expect(displayScale(3000, 1800)).toBe(2);
+    expect(displayScale(1920, 1080)).toBe(1);
+    expect(displayScale(2560, 1000)).toBe(1);
+  });
+  it('fits smaller windows without cropping the view', () => {
+    expect(displayScale(640, 360)).toBe(0.5);
+    expect(displayScale(320, 720)).toBe(0.25);
+  });
+});
diff --git a/game/src/core/viewport.ts b/game/src/core/viewport.ts
new file mode 100644
index 0000000..2338721
--- /dev/null
+++ b/game/src/core/viewport.ts
@@ -0,0 +1,8 @@
+export const VIEW_WIDTH = 1280;
+export const VIEW_HEIGHT = 720;
+
+/** Prefer whole pixels; smaller windows still fit the complete game view. */
+export function displayScale(width: number, height: number): number {
+  const fit = Math.min(width / VIEW_WIDTH, height / VIEW_HEIGHT);
+  return fit >= 1 ? Math.floor(fit) : Math.max(0.01, fit);
+}
diff --git a/game/src/main.ts b/game/src/main.ts
new file mode 100644
index 0000000..51146f8
--- /dev/null
+++ b/game/src/main.ts
@@ -0,0 +1,27 @@
+import Phaser from 'phaser';
+import { Boot, Preload, Stage, UI } from './core/scaffold';
+import { displayScale, VIEW_HEIGHT, VIEW_WIDTH } from './core/viewport';
+import './style.css';
+
+const game = new Phaser.Game({
+  type: Phaser.AUTO,
+  parent: 'game',
+  width: VIEW_WIDTH,
+  height: VIEW_HEIGHT,
+  backgroundColor: '#17242d',
+  pixelArt: true,
+  roundPixels: true,
+  input: { gamepad: true },
+  scale: { mode: Phaser.Scale.NONE, autoCenter: Phaser.Scale.CENTER_BOTH },
+  scene: [Boot, Preload, Stage, UI],
+});
+
+function resize() {
+  game.scale.setZoom(displayScale(window.innerWidth, window.innerHeight));
+}
+game.events.once(Phaser.Core.Events.READY, resize);
+window.addEventListener('resize', resize);
+if (import.meta.hot) import.meta.hot.dispose(() => {
+  window.removeEventListener('resize', resize);
+  game.destroy(true);
+});
diff --git a/game/src/style.css b/game/src/style.css
new file mode 100644
index 0000000..8f104c7
--- /dev/null
+++ b/game/src/style.css
@@ -0,0 +1,3 @@
+html, body, #game { margin: 0; width: 100%; height: 100%; overflow: hidden; }
+body { background: #0c1218; }
+canvas { display: block; image-rendering: pixelated; }
diff --git a/game/tsconfig.json b/game/tsconfig.json
new file mode 100644
index 0000000..e706746
--- /dev/null
+++ b/game/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM"],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "types": ["vite/client"]
+  },
+  "include": ["src"]
+}