/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.speed = 12;
	self.reset = function () {
		self.x = 1024;
		self.y = 1366;
		var angle = (Math.random() > 0.5 ? 1 : -1) * (Math.PI / 6 + Math.random() * Math.PI / 3);
		self.velocityX = Math.sin(angle) * self.speed;
		self.velocityY = Math.cos(angle) * self.speed * (Math.random() > 0.5 ? 1 : -1);
	};
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		// Bounce off left and right walls
		if (self.x <= 22.5 || self.x >= 2025.5) {
			self.velocityX = -self.velocityX;
		}
	};
	return self;
});
var Castle = Container.expand(function () {
	var self = Container.call(this);
	var castleGraphics = self.attachAsset('castle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
var Paddle = Container.expand(function () {
	var self = Container.call(this);
	var paddleGraphics = self.attachAsset('paddle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.targetX = self.x;
	self.moveTowards = function (targetX) {
		self.targetX = targetX;
		if (self.targetX < 125) self.targetX = 125;
		if (self.targetX > 1923) self.targetX = 1923;
	};
	self.update = function () {
		if (Math.abs(self.x - self.targetX) > 2) {
			if (self.x < self.targetX) {
				self.x += self.speed;
			} else {
				self.x -= self.speed;
			}
		}
	};
	return self;
});
var Particle = Container.expand(function () {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityX = (Math.random() - 0.5) * 8;
	self.velocityY = (Math.random() - 0.5) * 8;
	self.life = 30;
	self.maxLife = 30;
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.life--;
		var alpha = self.life / self.maxLife;
		particleGraphics.alpha = alpha;
		if (self.life <= 0) {
			self.destroy();
			particles.splice(particles.indexOf(self), 1);
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x001122
});

/**** 
* Game Code
****/ 
var gameTime = 90;
var playerScore = 0;
var aiScore = 0;
var particles = [];
// Create UI elements
var timerText = new Text2('90', {
	size: 80,
	fill: 0xFFFFFF
});
timerText.anchor.set(0.5, 0);
LK.gui.top.addChild(timerText);
var playerScoreText = new Text2('0', {
	size: 60,
	fill: 0x4A90E2
});
playerScoreText.anchor.set(0, 1);
LK.gui.bottomLeft.addChild(playerScoreText);
var aiScoreText = new Text2('0', {
	size: 60,
	fill: 0xE24A4A
});
aiScoreText.anchor.set(0, 0);
LK.gui.topLeft.addChild(aiScoreText);
// Create game objects
var playerPaddle = game.addChild(new Paddle());
playerPaddle.x = 1024;
playerPaddle.y = 2400;
var aiPaddle = game.addChild(new Paddle());
aiPaddle.x = 1024;
aiPaddle.y = 332;
var playerCastle = game.addChild(new Castle());
playerCastle.x = 1024;
playerCastle.y = 2642;
var aiCastle = game.addChild(new Castle());
aiCastle.x = 1024;
aiCastle.y = 90;
var ball = game.addChild(new Ball());
ball.reset();
var gameTimer = LK.setInterval(function () {
	gameTime--;
	timerText.setText(gameTime.toString());
	if (gameTime <= 0) {
		LK.clearInterval(gameTimer);
		if (playerScore > aiScore) {
			LK.showYouWin();
		} else {
			LK.showGameOver();
		}
	}
}, 1000);
var touchX = 1024;
function createParticles(x, y) {
	for (var i = 0; i < 8; i++) {
		var particle = game.addChild(new Particle());
		particle.x = x;
		particle.y = y;
		particles.push(particle);
	}
}
function checkPaddleCollision(paddle, ball) {
	var paddleLeft = paddle.x - 125;
	var paddleRight = paddle.x + 125;
	var paddleTop = paddle.y - 20;
	var paddleBottom = paddle.y + 20;
	var ballLeft = ball.x - 22.5;
	var ballRight = ball.x + 22.5;
	var ballTop = ball.y - 22.5;
	var ballBottom = ball.y + 22.5;
	return ballRight > paddleLeft && ballLeft < paddleRight && ballBottom > paddleTop && ballTop < paddleBottom;
}
game.down = function (x, y, obj) {
	touchX = x;
	playerPaddle.moveTowards(x);
};
game.move = function (x, y, obj) {
	touchX = x;
	playerPaddle.moveTowards(x);
};
game.update = function () {
	// AI paddle follows ball with some delay
	var targetX = ball.x + ball.velocityX * 10;
	if (targetX < 125) targetX = 125;
	if (targetX > 1923) targetX = 1923;
	aiPaddle.moveTowards(targetX);
	// Check paddle collisions
	if (checkPaddleCollision(playerPaddle, ball)) {
		if (ball.velocityY > 0) {
			ball.velocityY = -ball.velocityY;
			var hitOffset = (ball.x - playerPaddle.x) / 125;
			ball.velocityX += hitOffset * 2;
			createParticles(ball.x, ball.y);
			LK.getSound('paddleHit').play();
		}
	}
	if (checkPaddleCollision(aiPaddle, ball)) {
		if (ball.velocityY < 0) {
			ball.velocityY = -ball.velocityY;
			var hitOffset = (ball.x - aiPaddle.x) / 125;
			ball.velocityX += hitOffset * 2;
			createParticles(ball.x, ball.y);
			LK.getSound('paddleHit').play();
		}
	}
	// Check goal scoring
	if (ball.y < 0) {
		playerScore++;
		playerScoreText.setText(playerScore.toString());
		LK.setScore(playerScore);
		ball.reset();
		LK.getSound('goal').play();
	}
	if (ball.y > 2732) {
		aiScore++;
		aiScoreText.setText(aiScore.toString());
		ball.reset();
		LK.getSound('goal').play();
	}
	// Limit ball speed
	var maxSpeed = 12;
	var currentSpeed = Math.sqrt(ball.velocityX * ball.velocityX + ball.velocityY * ball.velocityY);
	if (currentSpeed > maxSpeed) {
		ball.velocityX = ball.velocityX / currentSpeed * maxSpeed;
		ball.velocityY = ball.velocityY / currentSpeed * maxSpeed;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -123,12 +123,12 @@
 LK.gui.topLeft.addChild(aiScoreText);
 // Create game objects
 var playerPaddle = game.addChild(new Paddle());
 playerPaddle.x = 1024;
-playerPaddle.y = 2600;
+playerPaddle.y = 2400;
 var aiPaddle = game.addChild(new Paddle());
 aiPaddle.x = 1024;
-aiPaddle.y = 132;
+aiPaddle.y = 332;
 var playerCastle = game.addChild(new Castle());
 playerCastle.x = 1024;
 playerCastle.y = 2642;
 var aiCastle = game.addChild(new Castle());