diff --git a/game-runtime/src/host/boot-game-host.js b/game-runtime/src/host/boot-game-host.js
index 2e5fbe77..9339dc2a 100644
--- a/game-runtime/src/host/boot-game-host.js
+++ b/game-runtime/src/host/boot-game-host.js
@@ -306,6 +306,11 @@ export async function bootGameHost(opts) {
     targetCanvas.addEventListener('pointerup', (ev) => {
       inputBridge._emit('pointerup', toCanvasXY(ev.clientX, ev.clientY));
     });
+    // 键盘桥接:挂 window(键盘无 canvas rect,坐标无关),补齐 getInput 契约的 key 两态。
+    // 对齐同仓 host-dev/host.js:427-428 已有范式;W-G1 scale-20 两轮对抗诊断实证:
+    // 原 attachInput 漏此桥 → 所有方向键/空格游戏(2048/Tetris/Asteroids)输入永远收不到、score≈0、phase 永久 playing。
+    window.addEventListener('keydown', (ev) => { unlockAudioOnce(); inputBridge._emit('keydown', { key: ev.key }); });
+    window.addEventListener('keyup', (ev) => inputBridge._emit('keyup', { key: ev.key }));
   }
 
   /* ── RAF（stub play 模式）── */