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new file mode 100644
index 0000000..4fcdbdf
--- /dev/null
+++ b/assets/_Game/Materials/mat_buff.mtl
@@ -0,0 +1,37 @@
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new file mode 100644
index 0000000..94362e3
--- /dev/null
+++ b/assets/_Game/Materials/mat_buff.mtl.meta
@@ -0,0 +1 @@
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index 1dbc8f1..c907499 100644
--- a/assets/_Game/Prefabs/Ball.prefab
+++ b/assets/_Game/Prefabs/Ball.prefab
@@ -1082,7 +1082,7 @@
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new file mode 100644
index 0000000..6e6f34a
--- /dev/null
+++ b/assets/_Game/Prefabs/Buff Particle.prefab	
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diff --git a/assets/_Game/Prefabs/Buff Particle.prefab.meta b/assets/_Game/Prefabs/Buff Particle.prefab.meta
new file mode 100644
index 0000000..d932834
--- /dev/null
+++ b/assets/_Game/Prefabs/Buff Particle.prefab.meta	
@@ -0,0 +1,13 @@
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diff --git a/assets/_Game/Scenes/EndLessScene.scene b/assets/_Game/Scenes/EndLessScene.scene
index 440eaff..848d3c1 100644
--- a/assets/_Game/Scenes/EndLessScene.scene
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   },
+  {
+    "__type__": "cc.Node",
+    "_name": "Timer",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 501
+    },
+    "_children": [],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 513
+      },
+      {
+        "__id__": 514
+      },
+      {
+        "__id__": 515
+      },
+      {
+        "__id__": 516
+      }
+    ],
+    "_prefab": null,
+    "_lpos": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 258.726,
+      "z": 0
+    },
+    "_lrot": {
+      "__type__": "cc.Quat",
+      "x": 0,
+      "y": 0,
+      "z": 0,
+      "w": 1
+    },
+    "_lscale": {
+      "__type__": "cc.Vec3",
+      "x": 1,
+      "y": 1,
+      "z": 1
+    },
+    "_mobility": 0,
+    "_layer": 33554432,
+    "_euler": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_id": "cbRYxjcYlKyK5RuiIILEDH"
+  },
   {
     "__type__": "cc.UITransform",
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 497
+      "__id__": 512
+    },
+    "_enabled": true,
+    "__prefab": null,
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 408.29,
+      "height": 134
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_id": "3ctMCfMNxCgbfB+vYxOIz3"
+  },
+  {
+    "__type__": "cc.Label",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 512
+    },
+    "_enabled": true,
+    "__prefab": null,
+    "_customMaterial": null,
+    "_srcBlendFactor": 2,
+    "_dstBlendFactor": 4,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_string": "00:00:00",
+    "_horizontalAlign": 2,
+    "_verticalAlign": 1,
+    "_actualFontSize": 100,
+    "_fontSize": 100,
+    "_fontFamily": "Arial",
+    "_lineHeight": 100,
+    "_overflow": 0,
+    "_enableWrapText": true,
+    "_font": null,
+    "_isSystemFontUsed": true,
+    "_spacingX": 0,
+    "_isItalic": false,
+    "_isBold": true,
+    "_isUnderline": false,
+    "_underlineHeight": 2,
+    "_cacheMode": 0,
+    "_id": "04vVYPL7REqKPnBCTG0JQI"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 512
+    },
+    "_enabled": true,
+    "__prefab": null,
+    "_alignFlags": 18,
+    "_target": null,
+    "_left": 0,
+    "_right": 50,
+    "_top": 200,
+    "_bottom": -76.00000000000001,
+    "_horizontalCenter": 0,
+    "_verticalCenter": 258.726,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 0,
+    "_originalHeight": 252,
+    "_alignMode": 2,
+    "_lockFlags": 0,
+    "_id": "75XfQEq7xK7q1uxB1f3Qv3"
+  },
+  {
+    "__type__": "cc.LabelOutline",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 512
+    },
+    "_enabled": true,
+    "__prefab": null,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 0,
+      "g": 0,
+      "b": 0,
+      "a": 255
+    },
+    "_width": 4,
+    "_id": "25d9gljfFFqZbvizsch6F+"
+  },
+  {
+    "__type__": "cc.UITransform",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 501
     },
     "_enabled": true,
     "__prefab": null,
@@ -19197,7 +19499,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 497
+      "__id__": 501
     },
     "_enabled": true,
     "__prefab": null,
@@ -19235,7 +19537,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 497
+      "__id__": 501
     },
     "_enabled": true,
     "__prefab": null,
@@ -19328,16 +19630,172 @@
       "__id__": 486
     },
     "_resultLabel": {
-      "__id__": 505
+      "__id__": 509
     },
+    "_buffFx": null,
     "_startPanel": {
-      "__id__": 488
+      "__id__": 492
     },
     "_overPanel": {
-      "__id__": 497
+      "__id__": 501
+    },
+    "_timeLabe": {
+      "__id__": 490
+    },
+    "_timeResult": {
+      "__id__": 514
     },
     "_id": "449hzGcyZL+Lsj/r1gnEMe"
   },
+  {
+    "__type__": "cc.Node",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 474
+    },
+    "_prefab": {
+      "__id__": 524
+    },
+    "__editorExtras__": {}
+  },
+  {
+    "__type__": "cc.PrefabInfo",
+    "root": {
+      "__id__": 523
+    },
+    "asset": {
+      "__uuid__": "c7549312-ab7b-4974-8863-1a55c119c34f",
+      "__expectedType__": "cc.Prefab"
+    },
+    "fileId": "d6MYHCymBFRbEj0OPlLt9v",
+    "instance": {
+      "__id__": 525
+    },
+    "targetOverrides": null,
+    "nestedPrefabInstanceRoots": null
+  },
+  {
+    "__type__": "cc.PrefabInstance",
+    "fileId": "571ZGjYsFNYb+wuKERqsTk",
+    "prefabRootNode": null,
+    "mountedChildren": [],
+    "mountedComponents": [],
+    "propertyOverrides": [
+      {
+        "__id__": 526
+      },
+      {
+        "__id__": 528
+      },
+      {
+        "__id__": 529
+      },
+      {
+        "__id__": 530
+      },
+      {
+        "__id__": 531
+      },
+      {
+        "__id__": 533
+      }
+    ],
+    "removedComponents": []
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 527
+    },
+    "propertyPath": [
+      "_name"
+    ],
+    "value": "Buff Particle"
+  },
+  {
+    "__type__": "cc.TargetInfo",
+    "localID": [
+      "d6MYHCymBFRbEj0OPlLt9v"
+    ]
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 527
+    },
+    "propertyPath": [
+      "_lpos"
+    ],
+    "value": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": -1400,
+      "z": 10
+    }
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 527
+    },
+    "propertyPath": [
+      "_lrot"
+    ],
+    "value": {
+      "__type__": "cc.Quat",
+      "x": 0,
+      "y": 0,
+      "z": 0,
+      "w": 1
+    }
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 527
+    },
+    "propertyPath": [
+      "_euler"
+    ],
+    "value": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    }
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 532
+    },
+    "propertyPath": [
+      "_enabled"
+    ],
+    "value": false
+  },
+  {
+    "__type__": "cc.TargetInfo",
+    "localID": [
+      "1fn6gSQXtGgIjZIz2U6eta"
+    ]
+  },
+  {
+    "__type__": "CCPropertyOverrideInfo",
+    "targetInfo": {
+      "__id__": 534
+    },
+    "propertyPath": [
+      "_enabled"
+    ],
+    "value": true
+  },
+  {
+    "__type__": "cc.TargetInfo",
+    "localID": [
+      "88kcSeLaNCI62fQBgRBS9L"
+    ]
+  },
   {
     "__type__": "cc.UITransform",
     "_name": "",
@@ -19409,27 +19867,58 @@
     "asset": null,
     "fileId": "4c16bf85-f009-4abe-b793-f3a1924392e4",
     "instance": null,
-    "targetOverrides": []
+    "targetOverrides": [
+      {
+        "__id__": 539
+      }
+    ],
+    "nestedPrefabInstanceRoots": [
+      {
+        "__id__": 523
+      }
+    ]
+  },
+  {
+    "__type__": "cc.TargetOverrideInfo",
+    "source": {
+      "__id__": 522
+    },
+    "sourceInfo": null,
+    "propertyPath": [
+      "_buffFx"
+    ],
+    "target": {
+      "__id__": 523
+    },
+    "targetInfo": {
+      "__id__": 540
+    }
+  },
+  {
+    "__type__": "cc.TargetInfo",
+    "localID": [
+      "b60TP4ZStBtZthYfiXRT3Q"
+    ]
   },
   {
     "__type__": "cc.SceneGlobals",
     "ambient": {
-      "__id__": 519
+      "__id__": 542
     },
     "shadows": {
-      "__id__": 520
+      "__id__": 543
     },
     "_skybox": {
-      "__id__": 521
+      "__id__": 544
     },
     "fog": {
-      "__id__": 522
+      "__id__": 545
     },
     "octree": {
-      "__id__": 523
+      "__id__": 546
     },
     "lightProbeInfo": {
-      "__id__": 524
+      "__id__": 547
     },
     "bakedWithStationaryMainLight": false,
     "bakedWithHighpLightmap": false
diff --git a/assets/_Game/Scripts/GamePlay/Enemy.ts b/assets/_Game/Scripts/GamePlay/Enemy.ts
index adb1df8..32302f1 100644
--- a/assets/_Game/Scripts/GamePlay/Enemy.ts
+++ b/assets/_Game/Scripts/GamePlay/Enemy.ts
@@ -15,6 +15,7 @@ import {
 import { EventManger } from '../Manager/EventManger';
 import GameEvent from '../Events/GameEvent';
 import ScoreType from '../Enum/ScoreType';
+import GameState from '../Enum/GameState';
 const { ccclass, property } = _decorator;
 
 @ccclass('Enemy')
@@ -47,16 +48,25 @@ export class Enemy extends Component {
 
     protected onLoad(): void {
         EventManger.instance.on(GameEvent.Score, this.onScore, this);
+        EventManger.instance.on(GameEvent.GameStateChange, this.onGameStateChange, this);
+
         this._collider.on(Contact2DType.BEGIN_CONTACT, this.onBeginContact, this);
     }
 
-    protected async start() {
+    protected start(): void {
+        this.init();
+    }
+
+    protected async init() {
         this._collider.node.setWorldPosition(this._patrolPoint1.worldPosition);
         const pos = this._patrolPoint1.getWorldPosition();
         this.x = pos.x;
         this.y = pos.y;
         this._distance = Math.abs(this._patrolPoint2.worldPosition.x - this.x);
         this._direction = this._patrolPoint1.worldPosition.x < this._patrolPoint2.worldPosition.x ? 1 : -1;
+        this._processDistance = 0;
+        this._currentGoal = 0;
+        this._isActive = false;
         this._collider.node.active = false;
     }
 
@@ -115,4 +125,16 @@ export class Enemy extends Component {
             }
         }
     }
+
+    private onGameStateChange(state: GameState) {
+        switch (state) {
+            case GameState.Init:
+                break;
+            case GameState.Playing:
+                break;
+            case GameState.GameOver:
+                this.init();
+                break;
+        }
+    }
 }
diff --git a/assets/_Game/Scripts/Manager/GameManager.ts b/assets/_Game/Scripts/Manager/GameManager.ts
index 94a3078..06066b9 100644
--- a/assets/_Game/Scripts/Manager/GameManager.ts
+++ b/assets/_Game/Scripts/Manager/GameManager.ts
@@ -10,6 +10,7 @@ import {
     Director,
     director,
     AudioClip,
+    Label,
 } from 'cc';
 import ObjectPool from '../Pool/ObjectPool';
 import { Ball } from '../GamePlay/Ball';
@@ -39,7 +40,7 @@ export class GameManager extends Component {
     @property({ visible: true })
     private _ballSpawnPosition: Vec3;
     @property({ type: CCInteger, visible: true })
-    private _balls = 3;
+    private readonly _ballsInit = 3;
     @property({ type: AudioClip, visible: true })
     private _startSound: AudioClip;
     @property({ type: AudioClip, visible: true })
@@ -48,10 +49,12 @@ export class GameManager extends Component {
     private _ballPool: ObjectPool;
     private _FloatingScorePool: ObjectPool;
     private _gameState: GameState;
+    private _balls: number;
 
     public get balls() {
-        return this._balls;
+        return this._ballsInit;
     }
+
     private _score = 0;
     private _isMultiBall = false;
     private _currentBallInGame = 0;
@@ -143,6 +146,7 @@ export class GameManager extends Component {
     }
 
     public async play() {
+        this._balls = this._ballsInit;
         SoundManager.instance.playBGM(this._backgroundMusic, 0.5);
         this.changeGameState(GameState.Playing);
         await Utilities.delay(1000);
@@ -150,7 +154,7 @@ export class GameManager extends Component {
     }
 
     public async restart() {
-        this._balls = 3;
+        this._balls = this._ballsInit;
         this._score = 0;
         this._currentBallInGame = 0;
         this._isMultiBall = false;
diff --git a/assets/_Game/Scripts/Manager/SoundManager.ts b/assets/_Game/Scripts/Manager/SoundManager.ts
index 72867f9..207c2a5 100644
--- a/assets/_Game/Scripts/Manager/SoundManager.ts
+++ b/assets/_Game/Scripts/Manager/SoundManager.ts
@@ -83,9 +83,15 @@ export class SoundManager extends Component {
 
     public playSfx(audioClip: AudioClip, volume = 1, loop = false) {
         let soundSource = this._audioSourcesSfx[audioClip.uuid];
+
         if (soundSource) {
             soundSource.volume = volume;
             soundSource.source.loop = loop;
+            if (loop) return;
+            if (soundSource.source.playing) {
+                soundSource.source.playOneShot(audioClip, this.isMute ? 0 : volume);
+                return;
+            }
             soundSource.play();
             return;
         }
diff --git a/assets/_Game/Scripts/Manager/SoundSource.ts b/assets/_Game/Scripts/Manager/SoundSource.ts
new file mode 100644
index 0000000..1ab0e8c
--- /dev/null
+++ b/assets/_Game/Scripts/Manager/SoundSource.ts
@@ -0,0 +1,35 @@
+import { AudioClip, AudioSource, Pool } from 'cc';
+import Utilities from '../Utilities';
+
+export class SoundSource {
+    private _pool: Pool<AudioSource>;
+    public volume = 1;
+    public mute = false;
+    public clip: AudioClip;
+    private _currentAudioSource: AudioSource;
+
+    constructor() {
+        this._pool = new Pool<AudioSource>(
+            () => {
+                const source = new AudioSource();
+                source.playOnAwake = false;
+                return source;
+            },
+            10,
+            (obj) => obj.destroy(),
+        );
+    }
+
+    public async play() {
+        this._currentAudioSource = this._pool.alloc();
+        this._currentAudioSource.volume = this.mute ? 0 : this.volume;
+        _currentAudioSource.clip = this.clip;
+        _currentAudioSource.play();
+        await Utilities.waitUntil(() => !source.playing);
+        this._pool.free(source);
+    }
+
+    public stop() {
+        this._currentAudioSource.stop();
+    }
+}
diff --git a/assets/_Game/Scripts/Manager/SoundSource.ts.meta b/assets/_Game/Scripts/Manager/SoundSource.ts.meta
new file mode 100644
index 0000000..8b4cd19
--- /dev/null
+++ b/assets/_Game/Scripts/Manager/SoundSource.ts.meta
@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "9f4eb11d-f1a9-42b3-a388-5c9e48c87851",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}
diff --git a/assets/_Game/Scripts/Manager/SpawnObjectManager.ts b/assets/_Game/Scripts/Manager/SpawnObjectManager.ts
index 33f19ac..9a920ee 100644
--- a/assets/_Game/Scripts/Manager/SpawnObjectManager.ts
+++ b/assets/_Game/Scripts/Manager/SpawnObjectManager.ts
@@ -3,6 +3,8 @@ import ObjectPool from '../Pool/ObjectPool';
 import { ScoreObject } from '../Environments/ScoreObject';
 import { EventManger } from './EventManger';
 import GameEvent from '../Events/GameEvent';
+import GameState from '../Enum/GameState';
+import Utilities from '../Utilities';
 const { ccclass, property } = _decorator;
 
 @ccclass('SpawnObjectManager')
@@ -23,11 +25,13 @@ export class SpawnObjectManager extends Component {
 
     private _pools: ObjectPool[] = [];
     private _usedPoints: { [key: string]: Node } = {};
+    private _playing = false;
     private _timer = 0;
 
     protected onLoad(): void {
         SpawnObjectManager._instance = this;
         EventManger.instance.on(GameEvent.ScoreObjectRelease, this.onObjectRelease, this);
+        EventManger.instance.on(GameEvent.GameStateChange, this.onGameStateChange, this);
 
         for (let i = 0; i < this._objects.length; i++) {
             const prefab = this._objects[i];
@@ -35,13 +39,8 @@ export class SpawnObjectManager extends Component {
         }
     }
 
-    protected start(): void {
-        for (let i = 0; i < randomRangeInt(5, 10); i++) {
-            this.spawn();
-        }
-    }
-
     protected update(dt: number): void {
+        if (!this._playing) return;
         this._timer += dt;
         if (this._timer >= this._spawnTime) {
             this._timer = 0;
@@ -63,4 +62,21 @@ export class SpawnObjectManager extends Component {
     private onObjectRelease(obj: Node) {
         delete this._usedPoints[obj.uuid];
     }
+
+    private onGameStateChange(state: GameState) {
+        switch (state) {
+            case GameState.Init:
+                break;
+            case GameState.Playing:
+                this._playing = true;
+                for (let i = 0; i < randomRangeInt(5, 10); i++) {
+                    this.spawn();
+                }
+                break;
+            case GameState.GameOver:
+                this._playing = false;
+                this._pools.forEach((pool) => pool.releaseAll());
+                break;
+        }
+    }
 }
diff --git a/assets/_Game/Scripts/Pool/ObjectPool.ts b/assets/_Game/Scripts/Pool/ObjectPool.ts
index 309a34b..01841b3 100644
--- a/assets/_Game/Scripts/Pool/ObjectPool.ts
+++ b/assets/_Game/Scripts/Pool/ObjectPool.ts
@@ -2,14 +2,18 @@ import { Component, Node, Prefab, director, instantiate } from 'cc';
 import IPoolable from './IPoolable';
 
 export default class ObjectPool {
-    private _inactives: Node[] = [];
+    private _inactive: Node[] = [];
     private _actives: Node[] = [];
     private _prefab: Prefab;
     private _expandable;
     private _poolHandlerComp: new () => any;
 
+    private get all() {
+        return [...this._actives, ...this._inactive];
+    }
+
     public get countInactive() {
-        return this._inactives.length;
+        return this._inactive.length;
     }
 
     public get countActive() {
@@ -27,7 +31,7 @@ export default class ObjectPool {
         for (let i = 0; i < size; ++i) {
             let obj = instantiate(this._prefab); // create node instance
             obj.removeFromParent();
-            this._inactives.push(obj);
+            this._inactive.push(obj);
             ObjectPool._poolLookUp[obj.uuid] = this;
         }
     }
@@ -44,9 +48,9 @@ export default class ObjectPool {
     public get<T extends Component>(parent?: Node, classConstructor?: new () => T): T | Node {
         let obj: Node = null;
         let p = parent || director.getScene();
-        if (this._inactives.length > 0) {
+        if (this._inactive.length > 0) {
             // Pop the last object in pool
-            obj = this._inactives.pop();
+            obj = this._inactive.pop();
         } else if (this._expandable) {
             // if not enough node in the pool, we call cc.instantiate to create node
             obj = instantiate(this._prefab);
@@ -74,10 +78,11 @@ export default class ObjectPool {
     public release<T extends Component>(obj: T | Node): void {
         let node = obj instanceof Node ? obj : obj.node;
         const index = this._actives.indexOf(node);
+
         //check obj is belongs to pool
         if (index === -1) return;
         this._actives.splice(index, 1);
-        this._inactives.push(node);
+        this._inactive.push(node);
         // Invoke pool handler
 
         const handler = this._poolHandlerComp ? node.getComponent(this._poolHandlerComp) : null;
@@ -89,8 +94,8 @@ export default class ObjectPool {
     }
 
     public clear() {
-        this._inactives.forEach((obj) => obj.destroy());
-        this._inactives = [];
+        this.all.forEach((obj) => obj.destroy());
+        this._inactive = [];
         this._actives = [];
         Object.keys(ObjectPool._poolLookUp).forEach((key) => {
             if (ObjectPool._poolLookUp[key] === this) {
@@ -98,4 +103,8 @@ export default class ObjectPool {
             }
         });
     }
+
+    public releaseAll() {
+        this.all.forEach((obj) => this.release(obj));
+    }
 }
diff --git a/assets/_Game/Scripts/UI/UIController.ts b/assets/_Game/Scripts/UI/UIController.ts
index 39fa0df..6b3cded 100644
--- a/assets/_Game/Scripts/UI/UIController.ts
+++ b/assets/_Game/Scripts/UI/UIController.ts
@@ -1,4 +1,4 @@
-import { _decorator, Component, Label, Node, tween } from 'cc';
+import { _decorator, Component, Label, Node, ParticleSystem, tween } from 'cc';
 import { EventManger } from '../Manager/EventManger';
 import GameEvent from '../Events/GameEvent';
 import ScoreType from '../Enum/ScoreType';
@@ -17,18 +17,34 @@ export class UIController extends Component {
     private _goalLabel: Label;
     @property({ type: Label, visible: true })
     private _resultLabel: Label;
+    @property({ type: ParticleSystem, visible: true })
+    private _buffFx: ParticleSystem;
     @property({ type: Node, visible: true })
     private _startPanel: Node;
     @property({ type: Node, visible: true })
     private _overPanel: Node;
+    @property({ type: Label, visible: true })
+    private _timeLabe: Label;
+    @property({ type: Label, visible: true })
+    private _timeResult: Label;
+    private _timer = 0;
+    private _playing = false;
 
     protected onLoad(): void {
         EventManger.instance.on(GameEvent.Score, this.onScore, this);
         EventManger.instance.on(GameEvent.BallOut, this.onBallOut, this);
         EventManger.instance.on(GameEvent.GameStateChange, this.onGameStateChange, this);
+        EventManger.instance.on(GameEvent.MultiBall, this.onMultiBall, this);
         this._goalLabel.string = '';
     }
 
+    protected update(dt: number): void {
+        if (this._playing) {
+            this._timer += dt;
+            this._timeLabe.string = this.secondsToTime(this._timer);
+        }
+    }
+
     private async onScore(score: number, type: ScoreType) {
         this._scoreLabel.string = `Score: ${score}`;
         if (type == ScoreType.Goal) {
@@ -51,15 +67,38 @@ export class UIController extends Component {
                 this._startPanel.active = true;
                 break;
             case GameState.Playing:
+                this._playing = true;
                 this._scoreLabel.string = 'Score: 0';
                 this._ballLabel.string = `Ball: ${GameManager.instance.balls}`;
                 this._startPanel.active = false;
                 this._overPanel.active = false;
                 break;
             case GameState.GameOver:
+                this._playing = false;
                 this._overPanel.active = true;
                 this._resultLabel.string = this._scoreLabel.string;
+                this._timeResult.string = this._timeLabe.string;
+                this._timer = 0;
                 break;
         }
     }
+
+    private onMultiBall(active: boolean) {
+        if (active) this._buffFx.play();
+        else this._buffFx.stop();
+    }
+
+    private secondsToTime(second: number) {
+        const h = Math.floor(second / 3600)
+                .toString()
+                .padStart(2, '0'),
+            m = Math.floor((second % 3600) / 60)
+                .toString()
+                .padStart(2, '0'),
+            s = Math.floor(second % 60)
+                .toString()
+                .padStart(2, '0');
+
+        return h + ':' + m + ':' + s;
+    }
 }