diff --git a/src/test/ZoomTestScene.ts b/src/test/ZoomTestScene.ts
new file mode 100644
index 0000000..4468841
--- /dev/null
+++ b/src/test/ZoomTestScene.ts
@@ -0,0 +1,239 @@
+import Phaser from 'phaser'
+import { TILE_SIZE } from '../config'
+
+const GRID_TILES    = 50     // world size in tiles
+const MIN_ZOOM      = 0.25
+const MAX_ZOOM      = 4.0
+const ZOOM_STEP     = 0.1
+const MARKER_EVERY  = 5      // small crosshair every N tiles
+const LABEL_EVERY   = 10     // coordinate label every N tiles
+const CAMERA_SPEED  = 400    // px/s
+
+/**
+ * First test scene: observes pure Phaser default zoom behavior.
+ * No custom scroll compensation — cam.setZoom() only, zoom anchors to camera center.
+ *
+ * Controls: Scroll wheel to zoom, WASD / Arrow keys to pan.
+ */
+export class ZoomTestScene extends Phaser.Scene {
+  private logText!: Phaser.GameObjects.Text
+  private keys!: {
+    up:    Phaser.Input.Keyboard.Key
+    down:  Phaser.Input.Keyboard.Key
+    left:  Phaser.Input.Keyboard.Key
+    right: Phaser.Input.Keyboard.Key
+    w:     Phaser.Input.Keyboard.Key
+    s:     Phaser.Input.Keyboard.Key
+    a:     Phaser.Input.Keyboard.Key
+    d:     Phaser.Input.Keyboard.Key
+  }
+
+  constructor() {
+    super({ key: 'ZoomTest' })
+  }
+
+  create(): void {
+    this.drawGrid()
+    this.setupCamera()
+    this.setupInput()
+    this.createOverlay()
+  }
+
+  /**
+   * Draws the static world grid into world space.
+   * - Faint tile lines on every tile boundary
+   * - Small green crosshairs every MARKER_EVERY tiles
+   * - Yellow labeled crosshairs every LABEL_EVERY tiles
+   * - Red world border
+   */
+  private drawGrid(): void {
+    const worldPx = GRID_TILES * TILE_SIZE
+    const g = this.add.graphics()
+
+    // Background fill
+    g.fillStyle(0x111811)
+    g.fillRect(0, 0, worldPx, worldPx)
+
+    // Tile grid lines
+    g.lineStyle(1, 0x223322, 0.5)
+    for (let i = 0; i <= GRID_TILES; i++) {
+      const p = i * TILE_SIZE
+      g.lineBetween(p, 0, p, worldPx)
+      g.lineBetween(0, p, worldPx, p)
+    }
+
+    // Crosshair markers
+    for (let tx = 0; tx <= GRID_TILES; tx += MARKER_EVERY) {
+      for (let ty = 0; ty <= GRID_TILES; ty += MARKER_EVERY) {
+        const px = tx * TILE_SIZE
+        const py = ty * TILE_SIZE
+        const isLabel = tx % LABEL_EVERY === 0 && ty % LABEL_EVERY === 0
+        const color   = isLabel ? 0xffff00 : 0x00ff88
+        const arm     = isLabel ? 10 : 6
+
+        g.lineStyle(1, color, isLabel ? 1.0 : 0.7)
+        g.lineBetween(px - arm, py, px + arm, py)
+        g.lineBetween(px, py - arm, px, py + arm)
+
+        g.fillStyle(color, 1.0)
+        g.fillCircle(px, py, isLabel ? 2.5 : 1.5)
+      }
+    }
+
+    // Coordinate labels at LABEL_EVERY intersections
+    for (let tx = 0; tx <= GRID_TILES; tx += LABEL_EVERY) {
+      for (let ty = 0; ty <= GRID_TILES; ty += LABEL_EVERY) {
+        this.add.text(
+          tx * TILE_SIZE + 4,
+          ty * TILE_SIZE + 4,
+          `${tx},${ty}`,
+          { fontSize: '9px', color: '#ffff88', fontFamily: 'monospace' }
+        ).setDepth(1)
+      }
+    }
+
+    // World border
+    g.lineStyle(2, 0xff4444, 1.0)
+    g.strokeRect(0, 0, worldPx, worldPx)
+  }
+
+  /**
+   * Sets camera bounds and centers the view on the world.
+   */
+  private setupCamera(): void {
+    const cam = this.cameras.main
+    const worldPx = GRID_TILES * TILE_SIZE
+    cam.setBounds(0, 0, worldPx, worldPx)
+    cam.scrollX = worldPx / 2 - cam.width  / 2
+    cam.scrollY = worldPx / 2 - cam.height / 2
+  }
+
+  /**
+   * Registers scroll wheel zoom and stores keyboard key references.
+   * Zoom uses cam.setZoom() only — pure Phaser default, anchors to camera center.
+   */
+  private setupInput(): void {
+    const cam = this.cameras.main
+    const kb  = this.input.keyboard!
+
+    this.keys = {
+      up:    kb.addKey(Phaser.Input.Keyboard.KeyCodes.UP),
+      down:  kb.addKey(Phaser.Input.Keyboard.KeyCodes.DOWN),
+      left:  kb.addKey(Phaser.Input.Keyboard.KeyCodes.LEFT),
+      right: kb.addKey(Phaser.Input.Keyboard.KeyCodes.RIGHT),
+      w:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.W),
+      s:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.S),
+      a:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.A),
+      d:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.D),
+    }
+
+    this.input.on('wheel', (
+      _ptr:  Phaser.Input.Pointer,
+      _objs: unknown,
+      _dx:   number,
+      dy:    number
+    ) => {
+      const newZoom = Phaser.Math.Clamp(cam.zoom - Math.sign(dy) * ZOOM_STEP, MIN_ZOOM, MAX_ZOOM)
+      cam.setZoom(newZoom)
+    })
+  }
+
+  /**
+   * Creates the fixed HUD text overlay (scroll factor 0 = screen space).
+   */
+  private createOverlay(): void {
+    this.logText = this.add.text(10, 10, '', {
+      fontSize: '13px',
+      color: '#e8e8e8',
+      backgroundColor: '#000000bb',
+      padding: { x: 10, y: 8 },
+      lineSpacing: 3,
+      fontFamily: 'monospace',
+    })
+      .setScrollFactor(0)
+      .setDepth(100)
+  }
+
+  update(_time: number, delta: number): void {
+    this.handleKeyboard(delta)
+    this.updateOverlay()
+  }
+
+  /**
+   * Moves camera with WASD / arrow keys at CAMERA_SPEED px/s (world space).
+   * @param delta - Frame delta in milliseconds
+   */
+  private handleKeyboard(delta: number): void {
+    const cam   = this.cameras.main
+    const speed = CAMERA_SPEED * (delta / 1000) / cam.zoom
+    const worldPx = GRID_TILES * TILE_SIZE
+
+    let dx = 0, dy = 0
+    if (this.keys.left.isDown  || this.keys.a.isDown) dx -= speed
+    if (this.keys.right.isDown || this.keys.d.isDown) dx += speed
+    if (this.keys.up.isDown    || this.keys.w.isDown) dy -= speed
+    if (this.keys.down.isDown  || this.keys.s.isDown) dy += speed
+
+    if (dx !== 0 && dy !== 0) { dx *= 0.707; dy *= 0.707 }
+
+    cam.scrollX = Phaser.Math.Clamp(cam.scrollX + dx, 0, worldPx - cam.width  / cam.zoom)
+    cam.scrollY = Phaser.Math.Clamp(cam.scrollY + dy, 0, worldPx - cam.height / cam.zoom)
+  }
+
+  /**
+   * Recomputes and renders all diagnostic values to the HUD overlay each frame.
+   */
+  private updateOverlay(): void {
+    const cam = this.cameras.main
+    const ptr = this.input.activePointer
+
+    // Viewport size in world pixels (what is actually visible)
+    const vpWidthPx   = cam.width  / cam.zoom
+    const vpHeightPx  = cam.height / cam.zoom
+
+    // Viewport size in tiles
+    const vpWidthTiles  = vpWidthPx  / TILE_SIZE
+    const vpHeightTiles = vpHeightPx / TILE_SIZE
+
+    // Camera center in world coords
+    const centerWorldX = cam.scrollX + vpWidthPx  / 2
+    const centerWorldY = cam.scrollY + vpHeightPx / 2
+
+    // Tile under mouse
+    const mouseTileX = Math.floor(ptr.worldX / TILE_SIZE)
+    const mouseTileY = Math.floor(ptr.worldY / TILE_SIZE)
+
+    // Tile at camera center
+    const centerTileX = Math.floor(centerWorldX / TILE_SIZE)
+    const centerTileY = Math.floor(centerWorldY / TILE_SIZE)
+
+    const renderer = this.game.renderer.type === Phaser.WEBGL ? 'WebGL' : 'Canvas'
+
+    const lines = [
+      '── ZOOM TEST  [Phaser default] ──',
+      '',
+      `Zoom:              ${cam.zoom.toFixed(4)}`,
+      `scrollX / scrollY: ${cam.scrollX.toFixed(2)} / ${cam.scrollY.toFixed(2)}`,
+      '',
+      `Viewport (screen): ${cam.width} × ${cam.height} px`,
+      `Viewport (world):  ${vpWidthPx.toFixed(2)} × ${vpHeightPx.toFixed(2)} px`,
+      `Viewport (tiles):  ${vpWidthTiles.toFixed(3)} × ${vpHeightTiles.toFixed(3)}`,
+      '',
+      `Center world:      ${centerWorldX.toFixed(2)}, ${centerWorldY.toFixed(2)}`,
+      `Center tile:       ${centerTileX}, ${centerTileY}`,
+      '',
+      `Mouse screen:      ${ptr.x.toFixed(1)}, ${ptr.y.toFixed(1)}`,
+      `Mouse world:       ${ptr.worldX.toFixed(2)}, ${ptr.worldY.toFixed(2)}`,
+      `Mouse tile:        ${mouseTileX}, ${mouseTileY}`,
+      '',
+      `Canvas:            ${this.scale.width} × ${this.scale.height} px`,
+      `TILE_SIZE:         ${TILE_SIZE} px`,
+      `roundPixels:       ${(this.game.renderer.config as Record<string, unknown>)['roundPixels']}`,
+      `Renderer:          ${renderer}`,
+      '',
+      '[Scroll] Zoom   [WASD / ↑↓←→] Pan',
+    ]
+
+    this.logText.setText(lines)
+  }
+}
diff --git a/src/test/main.ts b/src/test/main.ts
new file mode 100644
index 0000000..2aa42ff
--- /dev/null
+++ b/src/test/main.ts
@@ -0,0 +1,21 @@
+import Phaser from 'phaser'
+import { ZoomTestScene } from './ZoomTestScene'
+
+const config: Phaser.Types.Core.GameConfig = {
+  type: Phaser.AUTO,
+  width: window.innerWidth,
+  height: window.innerHeight,
+  backgroundColor: '#0d1a0d',
+  scene: [ZoomTestScene],
+  scale: {
+    mode: Phaser.Scale.RESIZE,
+    autoCenter: Phaser.Scale.CENTER_BOTH,
+  },
+  render: {
+    pixelArt: false,
+    antialias: true,
+    roundPixels: true,
+  },
+}
+
+new Phaser.Game(config)
diff --git a/test.html b/test.html
new file mode 100644
index 0000000..1eebe4a
--- /dev/null
+++ b/test.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Game — Test Scenes</title>
+    <style>
+      * { margin: 0; padding: 0; box-sizing: border-box; }
+      body { background: #000; overflow: hidden; display: flex; justify-content: center; align-items: center; height: 100vh; }
+      canvas { display: block; }
+    </style>
+  </head>
+  <body>
+    <script type="module" src="/src/test/main.ts"></script>
+  </body>
+</html>
diff --git a/vite.config.ts b/vite.config.ts
index b6ab531..6d5059d 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,4 +1,5 @@
 import { defineConfig } from 'vite'
+import { resolve } from 'path'
 
 export default defineConfig({
   server: {
@@ -7,6 +8,12 @@ export default defineConfig({
   },
   build: {
     outDir: 'dist',
-    assetsInlineLimit: 0
-  }
+    assetsInlineLimit: 0,
+    rollupOptions: {
+      input: {
+        main: resolve(__dirname, 'index.html'),
+        test: resolve(__dirname, 'test.html'),
+      },
+    },
+  },
 })