var Bonus = Container.expand(function () {
	var self = Container.call(this);
	var bonusGraphics = self.createAsset('bonus', 'Bonus Graphics', 0.5, 0.5);
	self.rotationSpeed = -0.01;
	self.fadeSpeed = 0.01;
	self.rotate = function () {
		self.rotation += self.rotationSpeed;
	};
	self.timer = LK.setTimeout(function () {
		self.destroy();
	}, 2000);
});
var Galaxy = Container.expand(function () {
	var self = Container.call(this);
	self.rotationSpeed = -0.00033333;
	var galaxyGraphics = self.createAsset('galaxy', 'Galaxy Graphics', 0.5, 0.5);
	galaxyGraphics.scale.set(12);
	self.scaleFactor = 0.0001;
	self.scaleDirection = 0.8;
});
var Sun = Container.expand(function () {
	var self = Container.call(this);
	var sunGraphics = self.createAsset('sun', 'Sun Graphics', 0.5, 0.5);
	sunGraphics.scale.set(4);
});
var Dot = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.createAsset('dot', 'Dot Graphics', 0.5, 0.5);
	dotGraphics.scale.set(Math.random() * (0.5 - 0.3) + 0.3);
	var colors = [0xFFFFFF, 0xADD8E6, 0xFFFFE0];
	dotGraphics.tint = colors[Math.floor(Math.random() * colors.length)];
	self.speed = {
		x: (Math.random() * 10 - 5) / 6,
		y: (Math.random() * 10 - 5) / 6
	};
	self.alpha = 0;
	self.fadeIn = true;
	self.fadeOut = false;
	self.lifeTime = 0;
	self.maxLifeTime = Math.floor(Math.random() * (1200 - 300 + 1)) + 300;
	self.move = function () {
		self.x += self.speed.x * 0.9;
		self.y += self.speed.y * 0.9;
		self.lifeTime++;
		if (self.fadeIn) {
			self.alpha += 0.01;
			if (self.alpha >= 1) {
				self.fadeIn = false;
			}
		} else if (self.fadeOut) {
			self.alpha -= 0.01;
			if (self.alpha <= 0) {
				self.x = Math.random() * 2048;
				self.y = Math.random() * 2732;
				self.alpha = 0;
				self.fadeIn = true;
				self.fadeOut = false;
				self.lifeTime = 0;
			}
		} else if (self.lifeTime >= self.maxLifeTime) {
			self.fadeOut = true;
		}
	};
});
var Paddle = Container.expand(function () {
	var self = Container.call(this);
	var paddleGraphics = self.createAsset('paddle', 'Paddle Graphics', 0.5, 0.5);
	self.speed = 20;
	self.move = function (direction) {
		self.y += direction * self.speed;
	};
});
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.createAsset('ball', 'Ball Graphics', 0.5, 0.5);
	self.speed = {
		x: 10,
		y: 10
	};
	self.rotationSpeed = 0.01;
	self.rotationDirection = 1;
	self.move = function () {
		self.x += self.speed.x;
		self.y += self.speed.y;
		self.rotation += self.rotationSpeed * self.rotationDirection;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var galaxy = self.addChild(new Galaxy());
	galaxy.x = 2048 / 2;
	galaxy.y = 2732 / 2;
	var playerPaddle = self.addChildAt(new Paddle(), self.children.length);
	var aiPaddle = self.addChildAt(new Paddle(), self.children.length);
	var ball = self.addChildAt(new Ball(), self.children.length);
	var bonus;
	function createBonus() {
		bonus = self.addChildAt(new Bonus(), self.children.length);
		bonus.x = (Math.random() * 0.2 + 0.4) * 2048;
		bonus.y = (Math.random() * 0.2 + 0.4) * 2732;
		bonus.on('down', function () {
			LK.clearTimeout(bonus.timer);
			bonus.scale.x *= 0.5;
			bonus.scale.y *= 0.5;
			bonus.alpha = 0;
			score += 3;
			bonus.destroy();
			var bonusDelay = Math.floor(Math.random() * (15000 - 7000 + 1)) + 7000;
			LK.setTimeout(createBonus, bonusDelay);
		});
	}
	var bonusDelay = Math.floor(Math.random() * (15000 - 7000 + 1)) + 7000;
	LK.setTimeout(createBonus, bonusDelay);
	var paddles = [playerPaddle, aiPaddle];
	var score = 0;
	playerPaddle.x = 100;
	playerPaddle.y = 2732 / 2;
	aiPaddle.x = 2048 - 100;
	aiPaddle.y = 2732 / 2;
	ball.x = 2048 / 2;
	ball.y = 2732 / 2;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var dots = [];
	for (var i = 0; i < 100; i++) {
		var dot = new Dot();
		dot.x = Math.random() * 2048;
		dot.y = Math.random() * 2732;
		dots.push(dot);
	}
	for (var i = 0; i < dots.length; i++) {
		self.addChild(dots[i]);
	}
	var targetY = playerPaddle.y;
	stage.on('down', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		targetY = pos.y;
	});
	stage.on('move', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		targetY = pos.y;
	});
	LK.on('tick', function () {
		if (targetY < playerPaddle.y) {
			playerPaddle.move(-1);
		} else if (targetY > playerPaddle.y) {
			playerPaddle.move(1);
		}
	});
	LK.on('tick', function () {
		ball.move();
		if (bonus) {
			bonus.rotate();
		}
		var direction = ball.y - aiPaddle.y;
		direction = direction / Math.abs(direction);
		aiPaddle.move(direction * 0.5);
		for (var i = 0; i < paddles.length; i++) {
			if (ball.intersects(paddles[i])) {
				var hitPoint = ball.y - paddles[i].y;
				var hitRatio = hitPoint / paddles[i].height;
				ball.speed.y += hitRatio * 10;
				if (ball.speed.x > 0 && ball.x < paddles[i].x || ball.speed.x < 0 && ball.x > paddles[i].x) {
					ball.speed.x *= -1;
					ball.rotationDirection *= -1;
				}
				if (paddles[i] === playerPaddle) {
					score++;
					if (bonus) {
						bonus.scale.x *= 1.01;
						bonus.scale.y *= 1.01;
						bonus.rotationSpeed *= 1.01;
					}
				}
			}
		}
		if (ball.y <= 0 || ball.y >= 2732) {
			ball.speed.y *= -1;
		}
		if (ball.x <= 0) {
			LK.showGameOver();
		}
		if (ball.x >= 2048) {
			score++;
			ball.x = 2048 / 2;
			ball.y = 2732 / 2;
			ball.speed.x = 10;
			ball.speed.y = 10;
		}
		scoreTxt.setText(score.toString());
		for (var i = 0; i < dots.length; i++) {
			dots[i].move();
		}
		galaxy.rotation += galaxy.rotationSpeed;
		galaxy.scale.x += galaxy.scaleFactor * galaxy.scaleDirection;
		galaxy.scale.y += galaxy.scaleFactor * galaxy.scaleDirection;
		if (galaxy.scale.x > 1.2 || galaxy.scale.x < 0.8) {
			galaxy.scaleDirection *= -1;
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,33 +1,15 @@
-var Particle = Container.expand(function () {
-	var self = Container.call(this);
-	var particleGraphics = self.createAsset('particle', 'Particle Graphics', 0.5, 0.5);
-	self.lifeTime = 0;
-	self.maxLifeTime = 60;
-	self.update = function () {
-		self.lifeTime++;
-		if (self.lifeTime >= self.maxLifeTime) {
-			self.destroy();
-		}
-	};
-});
 var Bonus = Container.expand(function () {
 	var self = Container.call(this);
 	var bonusGraphics = self.createAsset('bonus', 'Bonus Graphics', 0.5, 0.5);
 	self.rotationSpeed = -0.01;
 	self.fadeSpeed = 0.01;
-	self.lifeTime = 0;
-	self.maxLifeTime = 120 * 2;
 	self.rotate = function () {
 		self.rotation += self.rotationSpeed;
-		self.lifeTime++;
-		if (self.lifeTime >= self.maxLifeTime) {
-			self.alpha -= self.fadeSpeed * 2;
-			if (self.alpha <= 0) {
-				self.destroy();
-			}
-		}
 	};
+	self.timer = LK.setTimeout(function () {
+		self.destroy();
+	}, 2000);
 });
 var Galaxy = Container.expand(function () {
 	var self = Container.call(this);
 	self.rotationSpeed = -0.00033333;
@@ -100,14 +82,8 @@
 	self.move = function () {
 		self.x += self.speed.x;
 		self.y += self.speed.y;
 		self.rotation += self.rotationSpeed * self.rotationDirection;
-		if (LK.ticks % 6 == 0) {
-			var particle = new Particle();
-			particle.x = self.x;
-			particle.y = self.y;
-			self.parent.addChild(particle);
-		}
 	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
@@ -122,8 +98,9 @@
 		bonus = self.addChildAt(new Bonus(), self.children.length);
 		bonus.x = (Math.random() * 0.2 + 0.4) * 2048;
 		bonus.y = (Math.random() * 0.2 + 0.4) * 2732;
 		bonus.on('down', function () {
+			LK.clearTimeout(bonus.timer);
 			bonus.scale.x *= 0.5;
 			bonus.scale.y *= 0.5;
 			bonus.alpha = 0;
 			score += 3;
@@ -177,13 +154,8 @@
 		}
 	});
 	LK.on('tick', function () {
 		ball.move();
-		self.children.forEach(function (child) {
-			if (child instanceof Particle) {
-				child.update();
-			}
-		});
 		if (bonus) {
 			bonus.rotate();
 		}
 		var direction = ball.y - aiPaddle.y;