diff --git a/README.md b/README.md
index 0176750..eb28ea7 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ Then open:
 | Move / strafe     | `W` `A` `S` `D` (arrows also move)    |
 | Turn              | `←` `→`, or **mouse** (click to lock) |
 | Shoot             | **Left-click** (mouse locked) / `Space` |
+| Open / close door | `E`                                   |
 
 The game opens on a **main menu** listing the campaigns from
 `src/config/campaigns.json`. Pick one to play its levels in order; finishing
@@ -53,10 +54,11 @@ placeholder art until you provide a spritesheet):
 
 | File             | Defines                | Key fields |
 | ---------------- | ---------------------- | ---------- |
-| `walls.json`     | Wall tiles (ids 1+)    | `id` (int, used in level `tiles`), `name`, `solid`, `isDoor`, `color` (`#rrggbb`, placeholder/editor tint), `texture` (sheet path), `frame` |
+| `walls.json`     | Wall tiles (ids 1+)    | `id` (int, used in level `tiles`), `name`, `solid`, `isDoor`, `key` (key id a locked door needs, e.g. `"gold"`), `color` (`#rrggbb`, placeholder/editor tint), `texture` (sheet path), `frame` |
 | `overlays.json`  | Wall overlays          | `id` (string), `name`, `color`, `texture`, `frame` — transparent PNGs composited over the wall texture |
 | `items.json`     | Decorative items       | `id`, `name`, `color`, `blocking` (true = its cell is impassable), `scale` (height as a fraction of wall height), `texture`, `frame` |
 | `enemies.json`   | Enemy types            | `type`, `name`, `color`, `health`, `speed`, `points`, `texture`, `frame`; plus top-level `defaultType` (what v1 levels' generic "enemy" migrates to) |
+| `pickups.json`   | Pickups & keys         | `id` (used as the entity type), `name`, `color`, `effect` (`ammo` \| `health` \| `score` \| `key`), `amount`, `key` (key id granted when `effect` is `key`), `texture`, `frame` |
 | `campaigns.json` | Campaigns for the menu | `id`, `name`, `description`, `levels` (ordered filenames in `src/levels/`) |
 
 Notes:
@@ -66,8 +68,16 @@ Notes:
   paintings, banners, vines.
 - Items sit on **floor cells**. Blocking items stop the player like a wall but
   are not walls: shots and sight pass over them.
-- Pickups (`ammo`, `health`, `treasure`) and the `exit` are built-in because
-  they have hardcoded game effects.
+- **Doors** (`isDoor: true` walls) slide open Wolf3D-style when the player
+  presses `E` facing them, stay open a few seconds, then close (never on top
+  of the player). Give a door a `key` (e.g. `"gold"`) to lock it — the player
+  must first collect a pickup whose `effect` is `"key"` with the matching
+  `key` id. Collected keys show as colored chips in the HUD and reset each
+  level. The stock set ships an unlocked Door (id 5), a Gold Door (id 6), and
+  a Silver Door (id 7).
+- Pickup effects (`ammo`/`health`/`score`/`key`) and amounts live in
+  `pickups.json`; only the `exit` is built-in because ending the level is a
+  game mechanic.
 - Each config file has an embedded fallback copy in `src/engine/registry.js`,
   so a missing/broken file can't stop the game booting. Keep them in sync if
   you change defaults you care about offline.
@@ -85,8 +95,15 @@ and frame maps.** Overlay/item/enemy sheets should be transparent PNGs.
 ## Level editor (`/editor.html`)
 
 - **Palette** (top): dropdowns for **Wall / Overlay / Item / Enemy** (populated
-  from the config JSONs) plus **Start**, pickup, and **Erase** tool buttons.
-  Focusing a dropdown or clicking a button makes it the active brush.
+  from the config JSONs) plus **Start**, pickup, **Path**, and **Erase** tool
+  buttons. Focusing a dropdown or clicking a button makes it the active brush.
+- **Path tool**: click an enemy to select it (yellow ring), then click floor
+  cells to append patrol points. Click an existing point for a **Move /
+  Remove** menu (Move = the next click relocates it). Right-click deselects.
+  Paths draw as looped lines — faint for all enemies, highlighted for the
+  selection. In game the enemy walks spawn → points → spawn in a loop at its
+  `speed` from `enemies.json` (cells/sec), pausing briefly when shot. Paths
+  are author-trusted: one drawn through a wall will walk through it.
 - **Left-click / drag**: paint the selected brush. Overlays only apply to wall
   cells; items only to floor cells. Painting a wall clears anything inside it;
   painting floor clears the cell's overlay.
@@ -189,7 +206,7 @@ phaser`) and replace the file — no other changes needed.
   (see `assets/README.md`) — zero code changes.
 - **Enemy AI**: flesh out `Entity.update()` (patrol → chase → attack); each
   enemy def already carries a data-driven `speed`.
-- **Doors / keys**: door tiles are flagged `isDoor` in `walls.json`;
-  wire sliding + locked-door logic into `GameMap`/`Raycaster`.
+- **More door types**: doors + keys are data-driven — add a wall entry with
+  `isDoor: true` and a `key`, plus a matching key pickup in `pickups.json`.
 - **Sound, more campaigns**: add campaign entries to `campaigns.json`; hook
   audio into the scenes in `src/game`.
diff --git a/assets/README.md b/assets/README.md
index 2da59d3..66e0e27 100644
--- a/assets/README.md
+++ b/assets/README.md
@@ -23,8 +23,9 @@ there if you prefer a different arrangement):
 | `assets/textures/overlays.png`| `overlays.json` | **Transparent PNG** — composited over wall textures |
 | `assets/sprites/items.png`    | `items.json`    | **Transparent PNG** — billboard props (plant, lamp, …) |
 | `assets/sprites/enemies.png`  | `enemies.json`  | **Transparent PNG** — one frame per enemy type for now |
+| `assets/sprites/pickups.png`  | `pickups.json`  | **Transparent PNG** — ammo/health/treasure + keys |
 
-A 5-frame walls sheet is therefore 960×192; a 3-frame enemies sheet 576×192.
+A 7-frame walls sheet is therefore 1344×192; a 3-frame enemies sheet 576×192.
 
 You can also point different entries at different files — each unique
 `texture` path is loaded once and shared.
diff --git a/editor.html b/editor.html
index 9859ff8..3ca6375 100644
--- a/editor.html
+++ b/editor.html
@@ -124,6 +124,7 @@
       <span class="sep"></span>
       <button id="btn-tool-start">Start</button>
       <span id="pickup-tools" style="display: contents"></span>
+      <button id="btn-tool-path">Path</button>
       <button id="btn-tool-erase">Erase</button>
     </div>
     <div id="editor"></div>
diff --git a/sprites.md b/sprites.md
index f1d0878..3573a4b 100644
--- a/sprites.md
+++ b/sprites.md
@@ -23,21 +23,27 @@ No code changes needed — the paths and frame numbers below come straight from
 
 ## 1. `assets/textures/walls.png` — wall textures
 
-**5 frames → 960×192 px. Opaque** (no transparency; these fill the whole wall).
+**7 frames → 1344×192 px. Opaque** (no transparency; these fill the whole wall).
 
-| Frame | Pixels    | Wall (`walls.json`) | Placeholder it replaces        |
-| ----- | --------- | ------------------- | ------------------------------ |
-| 0     | 0–191     | id 1 — Gray Brick   | gray `#9a9a9a` brick courses   |
-| 1     | 192–383   | id 2 — Blue Stone   | blue `#4a6fa5` pattern         |
-| 2     | 384–575   | id 3 — Red Brick    | red `#a5503f` pattern          |
-| 3     | 576–767   | id 4 — Wood         | brown `#8a6a3a` planks         |
-| 4     | 768–959   | id 5 — Door         | gold `#c8a838` pattern         |
+| Frame | Pixels    | Wall (`walls.json`)      | Placeholder it replaces        |
+| ----- | --------- | ------------------------ | ------------------------------ |
+| 0     | 0–191     | id 1 — Gray Brick        | gray `#9a9a9a` brick courses   |
+| 1     | 192–383   | id 2 — Blue Stone        | blue `#4a6fa5` pattern         |
+| 2     | 384–575   | id 3 — Red Brick         | red `#a5503f` pattern          |
+| 3     | 576–767   | id 4 — Wood              | brown `#8a6a3a` planks         |
+| 4     | 768–959   | id 5 — Door              | gold `#c8a838` pattern         |
+| 5     | 960–1151  | id 6 — Gold Door (locked)| gold `#d4af37` pattern         |
+| 6     | 1152–1343 | id 7 — Silver Door (locked)| silver `#a8a8c0` pattern     |
 
 Notes:
 - One texture covers one full grid cell (all four faces use the same image;
   the engine un-mirrors back faces so text/asymmetric details stay readable).
 - Make the texture **tileable left-to-right** if you want long runs of the
   same wall type to look continuous.
+- Door frames (4–6) are drawn on the sliding panel itself — it slides sideways
+  as the door opens, so avoid critical detail hugging the left edge (that's
+  the edge that disappears first). Locked doors should visually hint at their
+  key color.
 
 ## 2. `assets/textures/overlays.png` — wall overlays
 
@@ -93,22 +99,38 @@ Notes:
 - The hurt flash is generated automatically (white-tinted copy) — you don't
   need to draw one.
 
+## 5. `assets/sprites/pickups.png` — pickups & keys
+
+**5 frames → 960×192 px. Transparent background required** — small
+floor-anchored billboards (drawn at 0.5 × wall height by default; add a
+`scale` field in `pickups.json` to change per pickup).
+
+| Frame | Pixels  | Pickup (`pickups.json`)  | Placeholder it replaces      |
+| ----- | ------- | ------------------------ | ---------------------------- |
+| 0     | 0–191   | `ammo` — Ammo            | yellow diamond               |
+| 1     | 192–383 | `health` — Health        | green diamond                |
+| 2     | 384–575 | `treasure` — Treasure    | gold diamond                 |
+| 3     | 576–767 | `key_gold` — Gold Key    | gold key glyph               |
+| 4     | 768–959 | `key_silver` — Silver Key| silver key glyph             |
+
+Notes:
+- Key colors should match their door and their HUD chip (the chip uses the
+  pickup's `color` from `pickups.json`).
+
 ## Not needed (yet)
 
-- **Pickups** (ammo, health, treasure) and the **exit** currently always use
-  their built-in generated diamond markers — there's no `texture` field for
-  them in a config file yet. If you want art for those too, say so and the
-  same pattern can be extended to them.
+- The **exit** uses a built-in generated marker (it's a level mechanic, not a
+  configurable pickup).
 - **Floors/ceilings** are flat colors (`FLOOR_COLOR` / `CEILING_COLOR` in
   `src/engine/constants.js`); textured floors are a separate engine feature.
 - **Weapon/hands** on the HUD is a gray rectangle stub (`HudScene`).
 
 ## Adding more content later
 
-New wall/overlay/item/enemy = one new 192×192 frame appended to the relevant
-strip + one JSON entry in `src/config/` pointing at its `frame` index. Nothing
-else. You can also start a fresh PNG per entry if you prefer — the `texture`
-path is per-entry, not global.
+New wall/overlay/item/enemy/pickup = one new 192×192 frame appended to the
+relevant strip + one JSON entry in `src/config/` pointing at its `frame`
+index. Nothing else. You can also start a fresh PNG per entry if you prefer —
+the `texture` path is per-entry, not global.
 
 ## Changing resolution later
 
diff --git a/src/config/walls.json b/src/config/walls.json
index 2ca9147..cd23415 100644
--- a/src/config/walls.json
+++ b/src/config/walls.json
@@ -45,6 +45,26 @@
       "color": "#c8a838",
       "texture": "assets/textures/walls.png",
       "frame": 4
+    },
+    {
+      "id": 6,
+      "name": "Gold Door",
+      "solid": true,
+      "isDoor": true,
+      "key": "gold",
+      "color": "#d4af37",
+      "texture": "assets/textures/walls.png",
+      "frame": 5
+    },
+    {
+      "id": 7,
+      "name": "Silver Door",
+      "solid": true,
+      "isDoor": true,
+      "key": "silver",
+      "color": "#a8a8c0",
+      "texture": "assets/textures/walls.png",
+      "frame": 6
     }
   ]
 }
diff --git a/src/editor/EditorScene.js b/src/editor/EditorScene.js
index 153aacd..c358c3f 100644
--- a/src/editor/EditorScene.js
+++ b/src/editor/EditorScene.js
@@ -49,11 +49,17 @@ export class EditorScene extends Phaser.Scene {
     //   { kind: 'enemy', type }     place an enemy
     //   { kind: 'pickup', type }    place a pickup / the exit
     //   { kind: 'start' }           move the player start
+    //   { kind: 'path' }            edit enemy patrol paths (select + points)
     //   { kind: 'erase' }           clear everything in the cell
     this.brush = { kind: 'wall', id: 1 };
     this.cellSize = 32;
     this.offsetX = 40;
     this.offsetY = TOP_MARGIN + 20;
+
+    // Path tool state.
+    this.selectedEnemy = null; // entity being path-edited
+    this.movingPoint = null; // path point index awaiting relocation
+    this.pointMenu = null; // the Move/Remove DOM popup
   }
 
   create() {
@@ -75,6 +81,12 @@ export class EditorScene extends Phaser.Scene {
     const controls = [];
     const setActive = (el, brush) => {
       this.brush = brush;
+      if (brush.kind !== 'path') {
+        // Leaving the path tool drops its selection state.
+        this.selectedEnemy = null;
+        this.movingPoint = null;
+        this.closePointMenu();
+      }
       for (const c of controls) c.classList.remove('active-tool');
       el.classList.add('active-tool');
     };
@@ -145,6 +157,7 @@ export class EditorScene extends Phaser.Scene {
       wireButton(btn, { kind: 'pickup', type: def.type });
     }
 
+    wireButton(document.getElementById('btn-tool-path'), { kind: 'path' });
     wireButton(document.getElementById('btn-tool-erase'), { kind: 'erase' });
 
     // Default brush: the first wall in the dropdown (skip Empty if possible).
@@ -214,12 +227,18 @@ export class EditorScene extends Phaser.Scene {
     this.cursors = this.input.keyboard.createCursorKeys();
     this.input.keyboard.addCapture('UP,DOWN,LEFT,RIGHT');
 
-    this.input.on('pointerdown', (p) => this.paintAt(p));
+    this.input.on('pointerdown', (p) => {
+      if (this.brush.kind === 'path') this.handlePathClick(p);
+      else this.paintAt(p);
+    });
     this.input.on('pointermove', (p) => {
       if (p.middleButtonDown()) {
         this.offsetX += p.x - p.prevPosition.x;
         this.offsetY += p.y - p.prevPosition.y;
-      } else if (p.leftButtonDown() || p.rightButtonDown()) {
+      } else if (
+        (p.leftButtonDown() || p.rightButtonDown()) &&
+        this.brush.kind !== 'path' // path edits are click, not drag
+      ) {
         this.paintAt(p);
       }
       this.updateHoverStatus(p);
@@ -309,6 +328,113 @@ export class EditorScene extends Phaser.Scene {
     this.removeItemAt(cell.x, cell.y);
   }
 
+  // --- Path tool --------------------------------------------------------------
+
+  /** Path tool click routing: relocate a moving point, open the Move/Remove
+   *  menu on a point, select an enemy, or append a point to the selection. */
+  handlePathClick(p) {
+    this.closePointMenu();
+    const cell = this.cellUnder(p);
+
+    if (p.rightButtonDown()) {
+      this.selectedEnemy = null;
+      this.movingPoint = null;
+      this.setStatus('Path selection cleared.');
+      return;
+    }
+
+    // A point is being moved: this click places it.
+    if (this.movingPoint !== null && this.selectedEnemy && cell) {
+      this.selectedEnemy.path[this.movingPoint] = {
+        x: cell.x + 0.5,
+        y: cell.y + 0.5,
+      };
+      this.movingPoint = null;
+      return;
+    }
+
+    // Clicked an existing path point → Move/Remove menu.
+    const pointIndex = this.pathPointUnder(p);
+    if (pointIndex !== null) {
+      this.showPointMenu(pointIndex, p.x, p.y);
+      return;
+    }
+
+    // Clicked an enemy → select it for path editing.
+    const enemy = cell ? this.enemyAt(cell.x, cell.y) : null;
+    if (enemy) {
+      this.selectedEnemy = enemy;
+      enemy.path ??= [];
+      this.movingPoint = null;
+      return;
+    }
+
+    // Clicked open floor with a selection → append a path point.
+    if (this.selectedEnemy && cell && !this.map.isWall(cell.x, cell.y)) {
+      this.selectedEnemy.path.push({ x: cell.x + 0.5, y: cell.y + 0.5 });
+    }
+  }
+
+  enemyAt(cx, cy) {
+    return (
+      this.level.entities.find(
+        (e) =>
+          getEntityDef(e.type)?.isEnemy &&
+          Math.floor(e.x) === cx &&
+          Math.floor(e.y) === cy,
+      ) ?? null
+    );
+  }
+
+  /** Index of the selected enemy's path point under the pointer, or null. */
+  pathPointUnder(p) {
+    const path = this.selectedEnemy?.path;
+    if (!path) return null;
+    const hitRadius = Math.max(8, this.cellSize * 0.25);
+    for (let i = 0; i < path.length; i++) {
+      const sx = this.offsetX + path[i].x * this.cellSize;
+      const sy = this.offsetY + path[i].y * this.cellSize;
+      if (Math.hypot(p.x - sx, p.y - sy) <= hitRadius) return i;
+    }
+    return null;
+  }
+
+  /** Small DOM popup on a path point: Move (relocate on next click) or
+   *  Remove (delete the point). */
+  showPointMenu(index, px, py) {
+    this.closePointMenu();
+    const menu = document.createElement('div');
+    menu.style.cssText =
+      `position:absolute;left:${Math.round(px)}px;top:${Math.round(py)}px;` +
+      'z-index:20;background:#2d2d36;border:1px solid #45454f;' +
+      'border-radius:4px;padding:4px;display:flex;gap:4px;';
+    const addButton = (label, onClick) => {
+      const btn = document.createElement('button');
+      btn.textContent = label;
+      btn.style.cssText =
+        'background:#3a3a46;color:#e6e6e6;border:1px solid #45454f;' +
+        'border-radius:3px;padding:3px 8px;cursor:pointer;font-size:12px;';
+      btn.onclick = onClick;
+      menu.appendChild(btn);
+    };
+    addButton('Move', () => {
+      this.movingPoint = index;
+      this.setStatus('Click a cell to place the path point.');
+      this.closePointMenu();
+    });
+    addButton('Remove', () => {
+      this.selectedEnemy?.path.splice(index, 1);
+      this.closePointMenu();
+    });
+    document.body.appendChild(menu);
+    this.pointMenu = menu;
+  }
+
+  closePointMenu() {
+    this.pointMenu?.remove();
+    this.pointMenu = null;
+  }
+
   removeEntityAt(cx, cy) {
     this.level.entities = this.level.entities.filter(
       (e) => Math.floor(e.x) !== cx || Math.floor(e.y) !== cy,
@@ -335,12 +461,24 @@ export class EditorScene extends Phaser.Scene {
         return `${b.kind}:${getEntityDef(b.type)?.name ?? b.type}`;
       case 'start':
         return 'player start';
+      case 'path':
+        return 'path editor';
       default:
         return 'erase';
     }
   }
 
   updateHoverStatus(p) {
+    if (this.brush.kind === 'path') {
+      const e = this.selectedEnemy;
+      this.setStatus(
+        e
+          ? `Path: ${getEntityDef(e.type)?.name ?? e.type} — ${e.path?.length ?? 0} point(s). ` +
+            'Click floor to add · click a point to move/remove · right-click to deselect.'
+          : 'Path: click an enemy to edit its patrol route.',
+      );
+      return;
+    }
     const cell = this.cellUnder(p);
     if (!cell) {
       this.setStatus(`Brush: ${this.brushLabel()}`);
@@ -448,6 +586,20 @@ export class EditorScene extends Phaser.Scene {
       g.strokeRect(ox + it.x * cs - s / 2, oy + it.y * cs - s / 2, s, s);
     }
 
+    // Drop a stale selection (e.g. the enemy was erased).
+    if (this.selectedEnemy && !this.level.entities.includes(this.selectedEnemy)) {
+      this.selectedEnemy = null;
+      this.movingPoint = null;
+      this.closePointMenu();
+    }
+
+    // Patrol paths: all faintly, the selected enemy's highlighted.
+    for (const e of this.level.entities) {
+      if (getEntityDef(e.type)?.isEnemy && e.path?.length) {
+        this.drawPath(g, e, e === this.selectedEnemy, ox, oy, cs);
+      }
+    }
+
     // Entities: enemies as large circles, pickups as small ones.
     for (const e of this.level.entities) {
       if (!onScreen(e)) continue;
@@ -455,8 +607,15 @@ export class EditorScene extends Phaser.Scene {
       const r = def?.isEnemy ? Math.max(3, cs * 0.28) : Math.max(2, cs * 0.18);
       g.fillStyle(def?.color ?? 0xff00ff, 1);
       g.fillCircle(ox + e.x * cs, oy + e.y * cs, r);
+      // Selection ring for the path tool.
+      if (e === this.selectedEnemy) {
+        g.lineStyle(2, 0xffe066, 1);
+        g.strokeCircle(ox + e.x * cs, oy + e.y * cs, r + 3);
+      }
     }
 
+    this.drawMovingPointHint(g, ox, oy, cs);
+
     // Player start (blue arrow in facing direction).
     const ps = this.level.playerStart;
     if (ps.x >= minX - 1 && ps.x <= maxX + 1 && ps.y >= minY - 1 && ps.y <= maxY + 1) {
@@ -475,4 +634,37 @@ export class EditorScene extends Phaser.Scene {
       );
     }
   }
+
+  /** Patrol route: looped line through spawn + points, points as diamonds. */
+  drawPath(g, e, selected, ox, oy, cs) {
+    const pts = [{ x: e.x, y: e.y }, ...e.path];
+    g.lineStyle(selected ? 2 : 1, selected ? 0xffe066 : 0xffffff, selected ? 0.9 : 0.3);
+    for (let i = 0; i < pts.length; i++) {
+      const a = pts[i];
+      const b = pts[(i + 1) % pts.length]; // close the loop back to spawn
+      g.lineBetween(ox + a.x * cs, oy + a.y * cs, ox + b.x * cs, oy + b.y * cs);
+    }
+    const s = Math.max(5, cs * 0.2);
+    for (let i = 1; i < pts.length; i++) {
+      const px = ox + pts[i].x * cs;
+      const py = oy + pts[i].y * cs;
+      g.fillStyle(selected ? 0xffe066 : 0xcccccc, selected ? 1 : 0.6);
+      g.fillTriangle(px, py - s, px + s, py, px, py + s);
+      g.fillTriangle(px, py - s, px - s, py, px, py + s);
+    }
+  }
+
+  /** While relocating a point, mark it with a pulsing ring so it's obvious
+   *  which one the next click will move. */
+  drawMovingPointHint(g, ox, oy, cs) {
+    if (this.movingPoint === null || !this.selectedEnemy) return;
+    const pt = this.selectedEnemy.path[this.movingPoint];
+    if (!pt) {
+      this.movingPoint = null;
+      return;
+    }
+    const pulse = 1 + 0.25 * Math.sin(this.time.now / 120);
+    g.lineStyle(2, 0xff5050, 1);
+    g.strokeCircle(ox + pt.x * cs, oy + pt.y * cs, Math.max(8, cs * 0.3) * pulse);
+  }
 }
diff --git a/src/engine/Entity.js b/src/engine/Entity.js
index 9e9cb21..a82cc38 100644
--- a/src/engine/Entity.js
+++ b/src/engine/Entity.js
@@ -17,6 +17,15 @@ export class Entity {
     this.state = 'idle'; // 'idle' | 'hurt' | 'dead' | 'collected'
     /** Ms remaining in a transient state (e.g. the hurt flinch flash). */
     this.stateTimer = 0;
+
+    // Patrol route (enemies only): the spawn point plus the level-authored
+    // path points, walked in a loop at the def's speed (cells/sec).
+    const path = Array.isArray(spawn.path) ? spawn.path : [];
+    this.waypoints =
+      this.def.isEnemy && path.length > 0
+        ? [{ x: spawn.x, y: spawn.y }, ...path.map((p) => ({ x: p.x, y: p.y }))]
+        : null;
+    this.wpIndex = 1; // current target (0 is the spawn point)
   }
 
   get isEnemy() {
@@ -52,6 +61,27 @@ export class Entity {
         this.state = 'idle';
       }
     }
-    // TODO: enemy AI (patrol/chase/attack/pathfinding) hooks in here.
+    this.updatePatrol(deltaMs);
+    // TODO: further enemy AI (chase/attack/pathfinding) hooks in here.
+  }
+
+  /** Walk the authored patrol loop. Getting shot (hurt flinch) pauses it.
+   *  Paths are author-trusted: no collision checks, so a path drawn through
+   *  a wall will walk through it. */
+  updatePatrol(deltaMs) {
+    if (!this.waypoints || !this.active || this.state === 'hurt') return;
+    const target = this.waypoints[this.wpIndex];
+    const step = (this.def.speed ?? 1.5) * (deltaMs / 1000);
+    const dx = target.x - this.x;
+    const dy = target.y - this.y;
+    const dist = Math.hypot(dx, dy);
+    if (dist <= step) {
+      this.x = target.x;
+      this.y = target.y;
+      this.wpIndex = (this.wpIndex + 1) % this.waypoints.length;
+    } else {
+      this.x += (dx / dist) * step;
+      this.y += (dy / dist) * step;
+    }
   }
 }
diff --git a/src/engine/GameMap.js b/src/engine/GameMap.js
index df0973c..03f7a40 100644
--- a/src/engine/GameMap.js
+++ b/src/engine/GameMap.js
@@ -1,4 +1,5 @@
 import { getWall, isSolid, getOverlayDef, getItemDef } from './registry.js';
+import { DOOR_SLIDE_MS, DOOR_OPEN_MS } from './constants.js';
 
 /** Runtime wrapper around a LevelData grid. Shared by the game (collision +
  *  raycasting) and the editor (paint/erase). Keeps all grid-index math in one
@@ -26,6 +27,26 @@ export class GameMap {
         this.blocked.add(Math.floor(it.y) * this.width + Math.floor(it.x));
       }
     }
+
+    // Sliding doors: one state record per door tile, keyed y*width+x.
+    // state: 'closed' | 'opening' | 'open' | 'closing'
+    // openness: 0 (fully closed) → 1 (fully open); the raycaster reads this to
+    // draw the door partially slid aside, and isWall() treats only fully-open
+    // doors as passable.
+    this.doors = new Map();
+    for (let i = 0; i < this.tiles.length; i++) {
+      const def = getWall(this.tiles[i]);
+      if (def.isDoor) {
+        this.doors.set(i, {
+          cx: i % this.width,
+          cy: Math.floor(i / this.width),
+          def,
+          state: 'closed',
+          openness: 0,
+          timer: 0,
+        });
+      }
+    }
   }
 
   inBounds(x, y) {
@@ -48,9 +69,12 @@ export class GameMap {
     this.tiles[cy * this.width + cx] = id;
   }
 
-  /** Whether a wall blocks sight/shots/rays at this cell. */
+  /** Whether a wall blocks sight/shots/rays at this cell. A door counts as a
+   *  wall until it has slid fully open. */
   isWall(x, y) {
-    return isSolid(this.tileAt(x, y));
+    if (!isSolid(this.tileAt(x, y))) return false;
+    const door = this.doorAt(x, y);
+    return door ? door.state !== 'open' : true;
   }
 
   /** Whether movement is blocked here — by a wall or by a blocking item. */
@@ -65,6 +89,68 @@ export class GameMap {
     return getWall(this.tileAt(x, y)).isDoor;
   }
 
+  /** The door state record at (x, y), or null. */
+  doorAt(x, y) {
+    return this.doors.get(Math.floor(y) * this.width + Math.floor(x)) ?? null;
+  }
+
+  /** How far open the door at (x, y) is (0 closed … 1 open); 0 if no door. */
+  doorOpenness(x, y) {
+    return this.doorAt(x, y)?.openness ?? 0;
+  }
+
+  /** Player pressed "use" on this cell. Toggles the door if there is one and
+   *  it isn't locked. Returns:
+   *    { used: false }                 — no door here
+   *    { used: false, locked: keyId }  — locked; the player lacks the key
+   *    { used: true }                  — door is now opening/closing */
+  useDoor(x, y, keys = new Set()) {
+    const door = this.doorAt(x, y);
+    if (!door) return { used: false };
+    if (door.state === 'closed' || door.state === 'closing') {
+      const needed = door.def.key;
+      if (needed && !keys.has(needed)) return { used: false, locked: needed };
+      door.state = 'opening';
+    } else if (door.state === 'open') {
+      door.state = 'closing';
+    }
+    return { used: true }; // an already-opening door swallows the press
+  }
+
+  /** Advance door animations. `occupied` is the player's cell — a door won't
+   *  auto-close on top of them. */
+  updateDoors(deltaMs, occupied) {
+    for (const door of this.doors.values()) {
+      switch (door.state) {
+        case 'opening':
+          door.openness += deltaMs / DOOR_SLIDE_MS;
+          if (door.openness >= 1) {
+            door.openness = 1;
+            door.state = 'open';
+            door.timer = DOOR_OPEN_MS;
+          }
+          break;
+        case 'open':
+          door.timer -= deltaMs;
+          if (door.timer <= 0) {
+            if (occupied && occupied.x === door.cx && occupied.y === door.cy) {
+              door.timer = DOOR_SLIDE_MS; // stand in the doorway → stay open
+            } else {
+              door.state = 'closing';
+            }
+          }
+          break;
+        case 'closing':
+          door.openness -= deltaMs / DOOR_SLIDE_MS;
+          if (door.openness <= 0) {
+            door.openness = 0;
+            door.state = 'closed';
+          }
+          break;
+      }
+    }
+  }
+
   /** Overlay def on the wall cell at (x, y), or null. */
   overlayAt(x, y) {
     const id = this.overlays.get(Math.floor(y) * this.width + Math.floor(x));
diff --git a/src/engine/Player.js b/src/engine/Player.js
index 8b2062f..881d9d5 100644
--- a/src/engine/Player.js
+++ b/src/engine/Player.js
@@ -18,6 +18,9 @@ export class Player {
     this.health = START_HEALTH;
     this.ammo = START_AMMO;
     this.score = 0;
+    /** Key ids collected this level (e.g. 'gold') — opens matching doors.
+     *  Classic raycaster rules: keys reset on every level. */
+    this.keys = new Set();
 
     const dirX = Math.cos(start.dir);
     const dirY = Math.sin(start.dir);
diff --git a/src/engine/Raycaster.js b/src/engine/Raycaster.js
index 74717aa..d2d4100 100644
--- a/src/engine/Raycaster.js
+++ b/src/engine/Raycaster.js
@@ -82,9 +82,15 @@ export class Raycaster {
       }
 
       // March until we hit a solid cell. `side` records which axis we crossed.
+      // Doors are special: their face sits recessed half a cell into the tile
+      // and slides sideways as it opens, so a door hit is checked against the
+      // mid-cell plane and the door's current openness.
       let hit = false;
       let side = 0; // 0 = x-side (NS wall), 1 = y-side (EW wall)
       let tileId = 1;
+      let isDoorHit = false;
+      let doorDist = 0;
+      let doorTexX = 0;
       let guard = 0;
       const maxSteps = (map.width + map.height) * 2;
       while (!hit && guard++ < maxSteps) {
@@ -102,13 +108,49 @@ export class Raycaster {
           lastDef = getWall(tileId);
           lastId = tileId;
         }
-        if (lastDef.solid) hit = true;
+        if (!lastDef.solid) continue;
+
+        if (lastDef.isDoor) {
+          // Where does the ray cross the recessed (mid-cell) door plane?
+          // sideDist values are ray parameters; the cell boundary was crossed
+          // at sideDist - deltaDist, the mid plane half a cell later.
+          let planeDist;
+          let coord; // 0..1 along the door face
+          if (side === 0) {
+            planeDist = sideDistX - deltaDistX / 2;
+            coord = cam.posY + planeDist * rayDirY - mapY;
+          } else {
+            planeDist = sideDistY - deltaDistY / 2;
+            coord = cam.posX + planeDist * rayDirX - mapX;
+          }
+          const openness = map.doorOpenness(mapX, mapY);
+          // The ray leaves the cell before reaching the recessed plane
+          // (grazing a corner), or passes through the open gap → keep going.
+          if (coord < openness || coord >= 1) continue;
+          hit = true;
+          isDoorHit = true;
+          doorDist = planeDist;
+          // Anchor the texture to the sliding panel so it moves with it, and
+          // un-mirror the back faces the same way as walls below.
+          doorTexX = Math.min(
+            TEX_SIZE - 1,
+            Math.floor((coord - openness) * TEX_SIZE),
+          );
+          if ((side === 0 && rayDirX < 0) || (side === 1 && rayDirY > 0)) {
+            doorTexX = TEX_SIZE - 1 - doorTexX;
+          }
+        } else {
+          hit = true;
+        }
       }
       const def = lastDef;
 
       // Perpendicular distance (avoids fisheye) = how far along the ray we are.
-      const perpDist =
-        side === 0 ? sideDistX - deltaDistX : sideDistY - deltaDistY;
+      const perpDist = isDoorHit
+        ? doorDist
+        : side === 0
+          ? sideDistX - deltaDistX
+          : sideDistY - deltaDistY;
       this.zBuffer[x] = perpDist;
 
       const lineHeight = Math.min(
@@ -120,15 +162,24 @@ export class Raycaster {
       let drawEnd = Math.min(height - 1, top + lineHeight - 1);
 
       // Texture x-coordinate: where along the wall face the ray hit (0..1).
-      let wallX =
-        side === 0
-          ? cam.posY + perpDist * rayDirY
-          : cam.posX + perpDist * rayDirX;
-      wallX -= Math.floor(wallX);
-      let texX = Math.floor(wallX * TEX_SIZE);
-      // Un-mirror the two faces that would otherwise render flipped.
-      if ((side === 0 && rayDirX > 0) || (side === 1 && rayDirY < 0)) {
-        texX = TEX_SIZE - 1 - texX;
+      // Door hits already computed theirs, anchored to the sliding panel.
+      let texX;
+      if (isDoorHit) {
+        texX = doorTexX;
+      } else {
+        let wallX =
+          side === 0
+            ? cam.posY + perpDist * rayDirY
+            : cam.posX + perpDist * rayDirX;
+        wallX -= Math.floor(wallX);
+        texX = Math.floor(wallX * TEX_SIZE);
+        // Un-mirror the two faces that would otherwise render flipped. Note:
+        // our camera plane is (-dirY, dirX) — the opposite perpendicular from
+        // the classic Lodev raycaster — so these conditions are the inverse
+        // of the ones usually quoted.
+        if ((side === 0 && rayDirX < 0) || (side === 1 && rayDirY > 0)) {
+          texX = TEX_SIZE - 1 - texX;
+        }
       }
 
       // Wall strip: 1px-wide source column scaled to the strip height. The
@@ -143,8 +194,9 @@ export class Raycaster {
       }
 
       // Overlay (painting, banner, …) alpha-composited over the wall texture,
-      // sharing the same texture coordinate so it sticks to the wall.
-      const overlay = map.overlayAt(mapX, mapY);
+      // sharing the same texture coordinate so it sticks to the wall. Doors
+      // are skipped — an overlay on a sliding panel would smear.
+      const overlay = isDoorHit ? null : map.overlayAt(mapX, mapY);
       if (overlay?.tex) {
         ctx.drawImage(overlay.tex, texX, 0, 1, TEX_SIZE, x, top, 1, lineHeight);
       }
diff --git a/src/engine/levelIO.js b/src/engine/levelIO.js
index 5821213..18f0719 100644
--- a/src/engine/levelIO.js
+++ b/src/engine/levelIO.js
@@ -27,6 +27,15 @@ export function migrateLevel(data) {
   data.version = LEVEL_FORMAT_VERSION;
   data.entities ??= [];
   data.name ??= 'Untitled';
+  // Optional per-enemy patrol paths: keep only well-formed points.
+  for (const e of data.entities) {
+    if (Array.isArray(e?.path)) {
+      e.path = e.path.filter(
+        (pt) => typeof pt?.x === 'number' && typeof pt?.y === 'number',
+      );
+      if (e.path.length === 0) delete e.path;
+    }
+  }
   // Keep only well-formed overlay/item entries so a hand-edited file can't
   // crash the renderer; ids are validated against the registry at use sites.
   data.overlays = (data.overlays ?? []).filter(
diff --git a/src/engine/registry.js b/src/engine/registry.js
index 95348d0..3d23f04 100644
--- a/src/engine/registry.js
+++ b/src/engine/registry.js
@@ -37,6 +37,8 @@ const DEFAULT_WALLS = {
     { id: 3, name: 'Red Brick', solid: true, isDoor: false, color: '#a5503f', texture: 'assets/textures/walls.png', frame: 2 },
     { id: 4, name: 'Wood', solid: true, isDoor: false, color: '#8a6a3a', texture: 'assets/textures/walls.png', frame: 3 },
     { id: 5, name: 'Door', solid: true, isDoor: true, color: '#c8a838', texture: 'assets/textures/walls.png', frame: 4 },
+    { id: 6, name: 'Gold Door', solid: true, isDoor: true, key: 'gold', color: '#d4af37', texture: 'assets/textures/walls.png', frame: 5 },
+    { id: 7, name: 'Silver Door', solid: true, isDoor: true, key: 'silver', color: '#a8a8c0', texture: 'assets/textures/walls.png', frame: 6 },
   ],
 };
 
@@ -73,15 +75,19 @@ const DEFAULT_CAMPAIGNS = {
   ],
 };
 
-/** Pickups (and the exit) have hardcoded game-logic effects (GameScene), so
- *  they stay a built-in table rather than a config file. They resolve through
- *  the same getEntityDef() as enemies. */
-const PICKUPS = [
-  { type: 'ammo', name: 'Ammo', color: '#d0d040' },
-  { type: 'health', name: 'Health', color: '#40c040' },
-  { type: 'treasure', name: 'Treasure', color: '#c0a020' },
-  { type: 'exit', name: 'Exit', color: '#00ff88' },
-];
+const DEFAULT_PICKUPS = {
+  pickups: [
+    { id: 'ammo', name: 'Ammo', color: '#d0d040', effect: 'ammo', amount: 10, texture: 'assets/sprites/pickups.png', frame: 0 },
+    { id: 'health', name: 'Health', color: '#40c040', effect: 'health', amount: 25, texture: 'assets/sprites/pickups.png', frame: 1 },
+    { id: 'treasure', name: 'Treasure', color: '#c0a020', effect: 'score', amount: 500, texture: 'assets/sprites/pickups.png', frame: 2 },
+    { id: 'key_gold', name: 'Gold Key', color: '#ffd700', effect: 'key', key: 'gold', texture: 'assets/sprites/pickups.png', frame: 3 },
+    { id: 'key_silver', name: 'Silver Key', color: '#c8c8d8', effect: 'key', key: 'silver', texture: 'assets/sprites/pickups.png', frame: 4 },
+  ],
+};
+
+/** The exit is a level mechanic (GameScene ends the level on touch), not a
+ *  configurable pickup, so it's always present regardless of pickups.json. */
+const EXIT_DEF = { type: 'exit', name: 'Exit', color: 0x00ff88, effect: null, isEnemy: false, health: 0 };
 
 /** The built-in floor tile; wall id 0 is always Empty and not configurable. */
 const EMPTY_TILE = { id: 0, name: 'Empty', solid: false, isDoor: false, color: 0x000000 };
@@ -121,6 +127,9 @@ function applyWalls(data) {
       name: w.name ?? `Wall ${w.id}`,
       solid: w.solid !== false,
       isDoor: w.isDoor === true,
+      // Key id (matches a pickups.json `key` field) needed to open this door;
+      // null = unlocked. Only meaningful when isDoor.
+      key: typeof w.key === 'string' ? w.key : null,
       color: parseColor(w.color, 0x9a9a9a),
       texture: w.texture ?? null,
       frame: w.frame ?? 0,
@@ -193,13 +202,21 @@ function applyCampaigns(data) {
     }));
 }
 
-function applyPickups() {
+function applyPickups(data) {
   reg.pickups.clear();
-  for (const p of PICKUPS) {
-    reg.pickups.set(p.type, {
-      type: p.type,
-      name: p.name,
+  reg.pickups.set(EXIT_DEF.type, { ...EXIT_DEF });
+  for (const p of data.pickups ?? []) {
+    if (typeof p.id !== 'string' || !p.id) continue;
+    reg.pickups.set(p.id, {
+      type: p.id,
+      name: p.name ?? p.id,
       color: parseColor(p.color),
+      effect: p.effect ?? null, // 'ammo' | 'health' | 'score' | 'key'
+      amount: typeof p.amount === 'number' ? p.amount : 0,
+      key: typeof p.key === 'string' ? p.key : null,
+      scale: typeof p.scale === 'number' ? p.scale : 0.5,
+      texture: p.texture ?? null,
+      frame: p.frame ?? 0,
       isEnemy: false,
       health: 0,
     });
@@ -213,7 +230,7 @@ applyOverlays(DEFAULT_OVERLAYS);
 applyItems(DEFAULT_ITEMS);
 applyEnemies(DEFAULT_ENEMIES);
 applyCampaigns(DEFAULT_CAMPAIGNS);
-applyPickups();
+applyPickups(DEFAULT_PICKUPS);
 
 // ---------------------------------------------------------------------------
 // Loading
@@ -250,19 +267,20 @@ export function initRegistry() {
 }
 
 async function doInit() {
-  const [walls, overlays, items, enemies, campaigns] = await Promise.all([
+  const [walls, overlays, items, enemies, campaigns, pickups] = await Promise.all([
     fetchConfig('walls.json', DEFAULT_WALLS),
     fetchConfig('overlays.json', DEFAULT_OVERLAYS),
     fetchConfig('items.json', DEFAULT_ITEMS),
     fetchConfig('enemies.json', DEFAULT_ENEMIES),
     fetchConfig('campaigns.json', DEFAULT_CAMPAIGNS),
+    fetchConfig('pickups.json', DEFAULT_PICKUPS),
   ]);
   applyWalls(walls);
   applyOverlays(overlays);
   applyItems(items);
   applyEnemies(enemies);
   applyCampaigns(campaigns);
-  applyPickups();
+  applyPickups(pickups);
 
   // Load every referenced spritesheet once.
   const defs = [
@@ -270,6 +288,7 @@ async function doInit() {
     ...reg.overlays.values(),
     ...reg.items.values(),
     ...reg.enemies.values(),
+    ...reg.pickups.values(),
   ];
   const paths = [...new Set(defs.map((d) => d.texture).filter(Boolean))];
   const images = new Map(
@@ -299,7 +318,8 @@ async function doInit() {
     def.texFlash = makeFlashVariant(def.tex);
   }
   for (const def of reg.pickups.values()) {
-    def.tex = makeSpritePlaceholder(def, 'pickup');
+    def.tex = bakeFrame(images.get(def.texture), def.frame, TEX_SIZE)
+      ?? makeSpritePlaceholder(def, def.effect === 'key' ? 'key' : 'pickup');
   }
 }
 
@@ -426,6 +446,16 @@ function makeSpritePlaceholder(def, kind) {
     ctx.fillStyle = shade(def.color, 0.65);
     ctx.fillRect(S * 0.3, S * 0.7, S * 0.4, S * 0.28);
     ctx.strokeRect(S * 0.3, S * 0.7, S * 0.4, S * 0.28);
+  } else if (kind === 'key') {
+    // Key: ring at the top, shaft down the middle, two teeth.
+    ctx.lineWidth = Math.max(4, S / 12);
+    ctx.strokeStyle = shade(def.color, 1);
+    ctx.beginPath();
+    ctx.arc(S / 2, S * 0.28, S * 0.14, 0, Math.PI * 2);
+    ctx.stroke();
+    ctx.fillRect(S * 0.46, S * 0.42, S * 0.08, S * 0.42);
+    ctx.fillRect(S * 0.54, S * 0.62, S * 0.12, S * 0.07);
+    ctx.fillRect(S * 0.54, S * 0.74, S * 0.16, S * 0.07);
   } else {
     // Pickup: floating diamond.
     ctx.beginPath();
@@ -497,6 +527,15 @@ export function getDefaultEnemyType() {
   return reg.defaultEnemyType;
 }
 
+/** The pickup def that grants key `keyId` (e.g. 'gold'), or null. Used for
+ *  the "you need the …" message and the HUD key chips. */
+export function getKeyDef(keyId) {
+  for (const p of reg.pickups.values()) {
+    if (p.effect === 'key' && p.key === keyId) return p;
+  }
+  return null;
+}
+
 /** All wall defs (including Empty, id 0), sorted by id — editor dropdown order. */
 export function listWalls() {
   return [...reg.walls.values()].sort((a, b) => a.id - b.id);
diff --git a/src/game/scenes/GameScene.js b/src/game/scenes/GameScene.js
index 2aacc60..d9ca797 100644
--- a/src/game/scenes/GameScene.js
+++ b/src/game/scenes/GameScene.js
@@ -5,7 +5,7 @@ import { Entity } from '../../engine/Entity.js';
 import { Raycaster } from '../../engine/Raycaster.js';
 import { SpriteRenderer } from '../../engine/SpriteRenderer.js';
 import { fetchLevel, getDefaultLevel } from '../../engine/levelIO.js';
-import { getItemDef } from '../../engine/registry.js';
+import { getItemDef, getKeyDef } from '../../engine/registry.js';
 import {
   RENDER_WIDTH,
   RENDER_HEIGHT,
@@ -86,7 +86,7 @@ export class GameScene extends Phaser.Scene {
 
   setupInput() {
     const kb = this.input.keyboard;
-    this.keys = kb.addKeys('W,A,S,D,UP,DOWN,LEFT,RIGHT,SPACE');
+    this.keys = kb.addKeys('W,A,S,D,UP,DOWN,LEFT,RIGHT,SPACE,E');
 
     // Click to capture the mouse; once captured, clicks fire.
     this.input.on('pointerdown', () => {
@@ -105,6 +105,23 @@ export class GameScene extends Phaser.Scene {
     });
   }
 
+  /** Probe a couple of points ahead of the player for a door and use it.
+   *  Locked doors flash a "you need the … key" message instead. */
+  tryUseDoor() {
+    const { cam } = this.player;
+    for (const dist of [1.0, 1.75]) {
+      const cx = Math.floor(cam.posX + cam.dirX * dist);
+      const cy = Math.floor(cam.posY + cam.dirY * dist);
+      const result = this.map.useDoor(cx, cy, this.player.keys);
+      if (result.used) return;
+      if (result.locked) {
+        const keyName = getKeyDef(result.locked)?.name ?? `${result.locked} key`;
+        this.game.events.emit('door-locked', keyName);
+        return;
+      }
+    }
+  }
+
   fire() {
     if (this.time.now - this.lastShot < WEAPON_FIRE_COOLDOWN) return;
     this.lastShot = this.time.now;
@@ -141,6 +158,15 @@ export class GameScene extends Phaser.Scene {
     // Keyboard fire fallback (Space), useful before grabbing the mouse.
     if (k.SPACE.isDown) this.fire();
 
+    // E uses the door ahead (open, or close an open one).
+    if (Phaser.Input.Keyboard.JustDown(k.E)) this.tryUseDoor();
+
+    const { cam } = this.player;
+    this.map.updateDoors(deltaMs, {
+      x: Math.floor(cam.posX),
+      y: Math.floor(cam.posY),
+    });
+
     for (const e of this.entities) e.update(deltaMs);
     this.handlePickups();
 
@@ -176,7 +202,7 @@ export class GameScene extends Phaser.Scene {
       }
       e.collect();
       this.applyPickup(e);
-      this.game.events.emit('player-pickup', e.type);
+      this.game.events.emit('player-pickup', e.def.name ?? e.type);
     }
   }
 
@@ -211,16 +237,21 @@ export class GameScene extends Phaser.Scene {
     this.scene.restart();
   }
 
+  /** Apply a collected pickup's data-driven effect (see pickups.json). */
   applyPickup(e) {
-    switch (e.type) {
+    const def = e.def;
+    switch (def.effect) {
       case 'ammo':
-        this.player.ammo += 10;
+        this.player.ammo += def.amount ?? 10;
         break;
       case 'health':
-        this.player.health = Math.min(100, this.player.health + 25);
+        this.player.health = Math.min(100, this.player.health + (def.amount ?? 25));
         break;
-      case 'treasure':
-        this.player.score += 500;
+      case 'score':
+        this.player.score += def.amount ?? 100;
+        break;
+      case 'key':
+        if (def.key) this.player.keys.add(def.key);
         break;
     }
   }
diff --git a/src/game/scenes/HudScene.js b/src/game/scenes/HudScene.js
index 5dc6384..5bfae10 100644
--- a/src/game/scenes/HudScene.js
+++ b/src/game/scenes/HudScene.js
@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { listPickups } from '../../engine/registry.js';
 import { GAME_WIDTH, GAME_HEIGHT } from '../main.js';
 
 /**
@@ -23,6 +24,15 @@ export class HudScene extends Phaser.Scene {
 
     this.statusText = this.add.text(16, 12, '', fontStyle).setScrollFactor(0);
 
+    // Collected keys, drawn as colored chips in the top-right corner. Colors
+    // come from the pickups registry (effect 'key').
+    this.keyColors = new Map(
+      listPickups()
+        .filter((p) => p.effect === 'key')
+        .map((p) => [p.key, p.color]),
+    );
+    this.keyGfx = this.add.graphics();
+
     this.messageText = this.add
       .text(GAME_WIDTH / 2, 48, '', { ...fontStyle, color: '#ffffff' })
       .setOrigin(0.5, 0)
@@ -48,7 +58,8 @@ export class HudScene extends Phaser.Scene {
     const handlers = {
       'player-fired': (result) => this.onFired(result),
       'player-empty': () => this.flash('*click* out of ammo'),
-      'player-pickup': (type) => this.flash(`Picked up ${type}`),
+      'player-pickup': (name) => this.flash(`Picked up ${name}`),
+      'door-locked': (keyName) => this.flash(`Locked — you need the ${keyName}`),
       'level-complete': () => this.flash('Level complete!'),
       'game-won': (score) => this.showVictory(score),
     };
@@ -135,6 +146,18 @@ export class HudScene extends Phaser.Scene {
       this.statusText.setText(
         `HEALTH ${p.health}   AMMO ${p.ammo}   SCORE ${p.score}`,
       );
+
+      // Key chips, top-right (a few rects — cheap to redraw every frame).
+      this.keyGfx.clear();
+      let i = 0;
+      for (const key of p.keys ?? []) {
+        const x = GAME_WIDTH - 44 - i * 34;
+        this.keyGfx.fillStyle(this.keyColors.get(key) ?? 0xffffff, 1);
+        this.keyGfx.fillRect(x, 14, 28, 18);
+        this.keyGfx.lineStyle(2, 0x000000, 0.6);
+        this.keyGfx.strokeRect(x, 14, 28, 18);
+        i++;
+      }
     }
 
     // Decay the muzzle flash and recoil.
diff --git a/src/levels/level1.data.js b/src/levels/level1.data.js
index 8200155..fe3050f 100644
--- a/src/levels/level1.data.js
+++ b/src/levels/level1.data.js
@@ -14,7 +14,7 @@ export default {
     1, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 0, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1,
-    1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 5, 2, 2, 2, 1,
+    1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 6, 2, 2, 2, 1,
     1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 1,
@@ -36,8 +36,10 @@ export default {
   ],
   "playerStart": { "x": 3.5, "y": 12.5, "dir": -1.5707963267948966 },
   "entities": [
-    { "type": "guard", "x": 6.5, "y": 3.5 },
+    { "type": "guard", "x": 6.5, "y": 3.5,
+      "path": [ { "x": 1.5, "y": 3.5 }, { "x": 1.5, "y": 1.5 }, { "x": 6.5, "y": 1.5 } ] },
     { "type": "scout", "x": 12.5, "y": 12.5 },
+    { "type": "key_gold", "x": 2.5, "y": 13.5 },
     { "type": "ammo", "x": 5.5, "y": 9.5 },
     { "type": "health", "x": 13.5, "y": 5.5 },
     { "type": "treasure", "x": 2.5, "y": 1.5 },
diff --git a/src/levels/level1.json b/src/levels/level1.json
index 8cb5439..df93b8b 100644
--- a/src/levels/level1.json
+++ b/src/levels/level1.json
@@ -11,7 +11,7 @@
     1, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 0, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1,
-    1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 5, 2, 2, 2, 1,
+    1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 6, 2, 2, 2, 1,
     1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
     1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 1,
@@ -33,8 +33,10 @@
   ],
   "playerStart": { "x": 3.5, "y": 12.5, "dir": -1.5707963267948966 },
   "entities": [
-    { "type": "guard", "x": 6.5, "y": 3.5 },
+    { "type": "guard", "x": 6.5, "y": 3.5,
+      "path": [ { "x": 1.5, "y": 3.5 }, { "x": 1.5, "y": 1.5 }, { "x": 6.5, "y": 1.5 } ] },
     { "type": "scout", "x": 12.5, "y": 12.5 },
+    { "type": "key_gold", "x": 2.5, "y": 13.5 },
     { "type": "ammo", "x": 5.5, "y": 9.5 },
     { "type": "health", "x": 13.5, "y": 5.5 },
     { "type": "treasure", "x": 2.5, "y": 1.5 },