diff --git a/game-runtime/src/adapter/adapter.test.mjs b/game-runtime/src/adapter/adapter.test.mjs
index 20d19a19..5b8cc7a4 100644
--- a/game-runtime/src/adapter/adapter.test.mjs
+++ b/game-runtime/src/adapter/adapter.test.mjs
@@ -23,6 +23,7 @@ import { createHostDevContext } from '../core/plugin.js';
 
 const HERE = dirname(fileURLToPath(import.meta.url));
 const SOURCE = JSON.parse(readFileSync(join(HERE, 'fixtures', 'tap-target.source.json'), 'utf8'));
+const DRIFT_SOURCE = JSON.parse(readFileSync(join(HERE, 'fixtures', 'moving-targets.source.json'), 'utf8'));
 
 /** 录制版 2D 上下文：记 fillRect/fillText 调用，setter 容纳 fillStyle/font/strokeStyle 赋值。 */
 function recordingCtx2d() {
@@ -120,3 +121,24 @@ test('destroy 幂等', () => {
   game.destroy();
   assert.equal(game._forensicsView().state().targets.length, 0);
 });
+
+test('drift-targets：update 后目标漂移(realtime/update 行为泛化)', () => {
+  const game = adaptGameDefinition(DRIFT_SOURCE)();
+  const { boot } = makeBoot();
+  game.init(boot);
+  const before = game._forensicsView().state().targets.map((t) => t.x);
+  game.update(0.1);
+  game.update(0.1);
+  const after = game._forensicsView().state().targets.map((t) => t.x);
+  assert.ok(after.some((x, i) => x !== before[i]), '至少一个目标 x 应漂移(update 行为生效)');
+});
+
+test('drift 下 tap 当前(漂移后)位仍命中计分', () => {
+  const game = adaptGameDefinition(DRIFT_SOURCE)();
+  const { boot, inputBridge } = makeBoot();
+  game.init(boot);
+  game.update(0.1);
+  const t0 = game._forensicsView().state().targets[0]; // 当前漂移后中心
+  inputBridge._emit('pointerdown', { x: t0.x, y: t0.y });
+  assert.equal(game._forensicsView().state().score, 1);
+});
diff --git a/game-runtime/src/adapter/create-game-from-definition.js b/game-runtime/src/adapter/create-game-from-definition.js
index 7c54d392..9b8ca24d 100644
--- a/game-runtime/src/adapter/create-game-from-definition.js
+++ b/game-runtime/src/adapter/create-game-from-definition.js
@@ -20,6 +20,8 @@ const VIEWPORT_H = 844;
 
 /** 最小 behavior 词汇表（声明式路支持的 op；其余 op = 走 code-agent 逻辑码，本切片不解释）。 */
 const SUPPORTED_INPUT_OPS = new Set(['hit-nearest-target']);
+/** trigger=update 的 op（本切片支持 drift-targets：目标随时间慢漂移，证 realtime/update behavior 路泛化）。 */
+const SUPPORTED_UPDATE_OPS = new Set(['drift-targets']);
 
 /**
  * 极小安全条件求值（无 eval）：解析 "<field> <op> <rhs>"。
@@ -92,12 +94,13 @@ export function adaptGameDefinition(source) {
     /** init：建目标、订阅受控输入、置 playing。 */
     function init(boot) {
       ctx = boot.ctx;
-      targets = activeEntities.map((e) => {
+      targets = activeEntities.map((e, i) => {
         const rc = renderCompOf(e) || {};
         const pos = (e.transform && e.transform.position) || { x: 0, y: 0 };
         return {
           id: e.id,
           x: pos.x, y: pos.y,
+          baseX: pos.x, baseY: pos.y, phase: i * 1.7, // drift-targets 用：漂移基准 + 错相
           w: typeof rc.w === 'number' ? rc.w : 48,
           h: typeof rc.h === 'number' ? rc.h : 48,
           color: typeof rc.color === 'string' ? rc.color : '#3cf',
@@ -148,6 +151,17 @@ export function adaptGameDefinition(source) {
     function update(dt) {
       if (ctx) { nowMs = ctx.time.nowMs(); state.t = nowMs / 1000; }
       if (state.phase !== 'playing') return; // 已终态：latch 驻留，不再评估
+      // trigger=update 行为（本切片：drift-targets 目标慢漂移，证 realtime/update 路）。
+      for (const b of behaviors) {
+        if (b.trigger !== 'update' || !SUPPORTED_UPDATE_OPS.has(b.op)) continue;
+        if (b.op === 'drift-targets') {
+          const amp = typeof b.amplitude === 'number' ? b.amplitude : 24;
+          const spd = typeof b.speed === 'number' ? b.speed : 0.8;
+          for (const tg of targets) {
+            tg.x = tg.baseX + amp * Math.sin(state.t * spd + tg.phase); // 慢漂移：driver 逐步读 _forensicsView 仍可命中
+          }
+        }
+      }
       for (const r of rules) {
         if (evalCondition(r.condition, state, config)) {
           if (r.outcome === 'win' || r.outcome === 'lose') {
diff --git a/game-runtime/src/adapter/fixtures/moving-targets.source.json b/game-runtime/src/adapter/fixtures/moving-targets.source.json
new file mode 100644
index 00000000..c7acea30
--- /dev/null
+++ b/game-runtime/src/adapter/fixtures/moving-targets.source.json
@@ -0,0 +1,26 @@
+{
+  "schemaVersion": "1.0",
+  "sourceHash": "1111111111111111111111111111111111111111111111111111111111111111",
+  "profile": { "tickModel": "realtime", "inputModel": "discrete-choice", "progressModel": "metric" },
+  "gameDefinition": {
+    "entities": [
+      { "id": "m1", "transform": { "position": { "x": 100, "y": 240 } }, "components": ["r-mov"] },
+      { "id": "m2", "transform": { "position": { "x": 200, "y": 440 } }, "components": ["r-mov"] },
+      { "id": "m3", "transform": { "position": { "x": 150, "y": 640 } }, "components": ["r-mov"] }
+    ],
+    "components": [
+      { "id": "r-mov", "kind": "render", "shape": "rect", "w": 60, "h": 60, "color": "#7cf" }
+    ],
+    "behaviors": [
+      { "id": "b-drift", "trigger": "update", "op": "drift-targets", "amplitude": 24, "speed": 0.8 },
+      { "id": "b-tap", "trigger": "input", "op": "hit-nearest-target" }
+    ],
+    "scenes": [
+      { "id": "s1", "entityRefs": ["m1", "m2", "m3"] }
+    ],
+    "rules": [
+      { "id": "win", "condition": "score >= config.winScore", "outcome": "win" }
+    ]
+  },
+  "config": { "winScore": 3, "hitRadius": 60 }
+}