var Particles = Container.expand(function () {
	var self = Container.call(this);
	var particlesGraphics = self.createAsset('particles', 'Particles Graphics', 0.5, 0.5);
	self.speed = {
		x: (Math.random() * 10 - 5) / 6,
		y: (Math.random() * 10 - 5) / 6
	};
	self.move = function () {
		self.x += self.speed.x;
		self.y += self.speed.y;
	};
});
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.rotate = function () {
		self.rotation += self.rotationSpeed;
	};
});
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 = self.addChildAt(new Bonus(), 0);
	bonus.x = Math.random() < 0.5 ? 0 : 2048;
	bonus.y = Math.random() < 0.5 ? 0 : 2732;
	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 (LK.ticks % 3 == 0) {
			var particles = new Particles();
			particles.x = ball.x;
			particles.y = ball.y;
			self.addChild(particles);
		}
		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++;
					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
@@ -1,7 +1,7 @@
-var Particle = Container.expand(function () {
+var Particles = Container.expand(function () {
 	var self = Container.call(this);
-	var particleGraphics = self.createAsset('particle', 'Particle Graphics', 0.5, 0.5);
+	var particlesGraphics = self.createAsset('particles', 'Particles Graphics', 0.5, 0.5);
 	self.speed = {
 		x: (Math.random() * 10 - 5) / 6,
 		y: (Math.random() * 10 - 5) / 6
 	};
@@ -117,17 +117,17 @@
 		fill: "#ffffff"
 	});
 	scoreTxt.anchor.set(.5, 0);
 	LK.gui.topCenter.addChild(scoreTxt);
-	var particles = [];
+	var dots = [];
 	for (var i = 0; i < 100; i++) {
-		var particle = new Particle();
-		particle.x = ball.x;
-		particle.y = ball.y;
-		particles.push(particle);
+		var dot = new Dot();
+		dot.x = Math.random() * 2048;
+		dot.y = Math.random() * 2732;
+		dots.push(dot);
 	}
-	for (var i = 0; i < particles.length; i++) {
-		self.addChild(particles[i]);
+	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;
@@ -147,8 +147,14 @@
 		}
 	});
 	LK.on('tick', function () {
 		ball.move();
+		if (LK.ticks % 3 == 0) {
+			var particles = new Particles();
+			particles.x = ball.x;
+			particles.y = ball.y;
+			self.addChild(particles);
+		}
 		bonus.rotate();
 		var direction = ball.y - aiPaddle.y;
 		direction = direction / Math.abs(direction);
 		aiPaddle.move(direction * 0.5);
@@ -182,10 +188,10 @@
 			ball.speed.x = 10;
 			ball.speed.y = 10;
 		}
 		scoreTxt.setText(score.toString());
-		for (var i = 0; i < particles.length; i++) {
-			particles[i].move();
+		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;