/**** 
* Classes
****/ 
var Base = Container.expand(function () {
	var self = Container.call(this);
	self.health = 100;
	self.updateHealth = function () {};
});
var Enemy = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.showExplosion = function () {
		self.gameInstance.showExplosion(self.x, self.y);
		self.destroy();
	};
	self.gameInstance = gameInstance;
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.tiltDirection = 1;
	self._move_migrated = function () {
		self.y += self.speed;
		self.rotation += 0.005 * self.tiltDirection;
		if (self.rotation > 0.15 || self.rotation < -0.15) {
			self.tiltDirection *= -1;
		}
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.showExplosion();
		LK.getSound('Hit').play();
		self.gameInstance.updateCoins(10 + self.gameInstance.enemyRewardIncrement);
		self.gameInstance.removeEnemy(self);
		self.gameInstance.incrementScore();
	};
});
var Enemy_2 = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.showExplosion = function () {
		self.gameInstance.showExplosion(self.x, self.y);
		self.destroy();
	};
	self.gameInstance = gameInstance;
	var enemyGraphics = self.attachAsset('enemy_2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.tiltDirection = 1;
	self._move_migrated = function () {
		self.y += self.speed;
		self.rotation += 0.005 * self.tiltDirection;
		if (self.rotation > 0.15 || self.rotation < -0.15) {
			self.tiltDirection *= -1;
		}
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.showExplosion();
		LK.getSound('Hit').play();
		self.gameInstance.updateCoins(20 + self.gameInstance.enemyRewardIncrement);
		self.gameInstance.removeEnemy(self);
		self.gameInstance.incrementScore();
	};
});
var Enemy_3 = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.showExplosion = function () {
		self.gameInstance.showExplosion(self.x, self.y);
		self.destroy();
	};
	self.gameInstance = gameInstance;
	var enemyGraphics = self.attachAsset('enemy_3', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 7;
	self.tiltDirection = 1;
	self._move_migrated = function () {
		self.y += self.speed;
		self.rotation += 0.005 * self.tiltDirection;
		if (self.rotation > 0.15 || self.rotation < -0.15) {
			self.tiltDirection *= -1;
		}
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.showExplosion();
		LK.getSound('Hit').play();
		self.gameInstance.updateCoins(30 + self.gameInstance.enemyRewardIncrement);
		self.gameInstance.removeEnemy(self);
		self.gameInstance.incrementScore();
	};
});
var Snowball = Container.expand(function (speed) {
	var self = Container.call(this);
	self.x = arguments[1];
	self.y = arguments[2];
	self.speed = speed;
	self.rotationSpeed = 0.05;
	var snowballGraphics = self.attachAsset('snowball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = speed;
	self._move_migrated = function () {
		self.rotation += self.rotationSpeed;
	};
});
var Spawner = Container.expand(function (x, y) {
	var self = Container.call(this);
	var spawnerGraphics = self.attachAsset('spawner', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = x;
	self.y = y;
	self.enemyWeights = {
		'Enemy': 80,
		'Enemy_2': 13,
		'Enemy_3': 6,
		'total': 99,
		'bucket': []
	};
	self.resetEnemyBucket = function () {
		for (var key in self.enemyWeights) {
			if (key !== 'total' && key !== 'bucket') {
				for (var i = 0; i < self.enemyWeights[key]; i++) {
					self.enemyWeights.bucket.push(key);
				}
			}
		}
	};
	self.resetEnemyBucket();
	self.spawnEnemy = function () {
		if (self.enemyWeights.bucket.length === 0) {
			self.resetEnemyBucket();
		}
		var randomIndex = Math.floor(Math.random() * self.enemyWeights.bucket.length);
		var chosenEnemy = self.enemyWeights.bucket.splice(randomIndex, 1)[0];
		var enemy;
		switch (chosenEnemy) {
			case 'Enemy':
				enemy = new Enemy(self, self.parent);
				enemy.speed += self.parent.enemySpeedIncrement;
				break;
			case 'Enemy_2':
				enemy = new Enemy_2(self, self.parent);
				enemy.speed += self.parent.enemySpeedIncrement;
				break;
			case 'Enemy_3':
				enemy = new Enemy_3(self, self.parent);
				enemy.speed += self.parent.enemySpeedIncrement;
				break;
		}
		if (!enemy) {
			throw new Error('Invalid enemy type: ' + chosenEnemy);
		}
		enemy.x = self.x + 20;
		enemy.y = self.y + 250;
		self.parent.enemyLayer.addChild(enemy);
		self.parent.enemies.push(enemy);
	};
});
var Tower = Container.expand(function (gameInstance) {
	var self = Container.call(this);
	self.createAndShootSnowball = function () {
		var snowball = new Snowball(self.snowballSpeed);
		var towerBounds = self.getBounds();
		snowball.x = self.x + towerBounds.width / 2 + 15;
		snowball.y = self.y + towerBounds.height / 2 + 15;
		self.activeSnowball = snowball;
		snowball.on('destroyed', self.onSnowballDestroyed);
		self.gameInstance.bullets.push(snowball);
		self.gameInstance.addChildAt(snowball, self.gameInstance.getChildIndex(self.BuyBtn));
	};
	self.activeSnowball = null;
	self.gameInstance = gameInstance;
	self.isActive = false;
	self.level = 1;
	self.upgradeCost = 50;
	self.snowballSpeed = 5;
	self.activationCost = 5;
	self.BuyBtn = null;
	self.alpha = 1;
	self.x = 1024;
	self.y = 1366;
	self.shootSnowball = function () {
		if (self.isActive && !self.gameInstance.isGameOver && self.activeSnowball === null) {
			self.createAndShootSnowball();
		}
	};
	self.scheduleNextSnowball = function () {
		if (this.isActive) {
			self.shootSnowball();
			LK.setTimeout(this.scheduleNextSnowball.bind(this), 2000);
		}
	};
	self.onSnowballDestroyed = function () {
		self.activeSnowball = null;
		self.scheduleNextSnowball();
	};
	self.upgrade = function () {
		if (this.gameInstance.coins >= this.upgradeCost) {
			this.gameInstance.coins -= this.upgradeCost;
			LK.getSound('Buy').play(); // Play the Buy sound
			this.gameInstance.updateCoins(0);
			this.level++;
			if (this.level === 2) {
				this.isActive = true;
				this.scheduleNextSnowball();
			}
			if (this.level > 2) {
				this.snowballSpeed += 2;
				this.gameInstance.bullets.forEach(function (bullet) {
					if (bullet instanceof Snowball && bullet.speed < this.snowballSpeed) {
						bullet.speed = this.snowballSpeed;
					}
				}.bind(this));
			}
			var speedUpAsset = this.gameInstance.createAsset('SpeedUp', 'SpeedUp Graphics', 0.5, 0.5);
			speedUpAsset.x = 1150;
			speedUpAsset.y = 1200;
			this.gameInstance.addChildAt(speedUpAsset, 1);
			LK.setTimeout(function () {
				speedUpAsset.destroy();
			}, 1000);
			this.upgradeCost += 50;
			this.towerCostText.setText(this.upgradeCost.toString());
			this.gameInstance.increaseEnemySpeed(0.5);
			this.gameInstance.enemyRewardIncrement += 1;
		}
		if (this.BuyBtn) {
			this.BuyBtn.visible = this.gameInstance.coins >= this.upgradeCost;
			this.towerCostText.alpha = this.gameInstance.coins >= this.upgradeCost ? 1 : 0.5;
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
game.showExplosion = function (x, y) {
	var explosion = game.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	explosion.x = x;
	explosion.y = y;
	game.addChild(explosion);
	LK.setTimeout(function () {
		explosion.destroy();
	}, 150);
};
game.increaseEnemySpeed = function (speedIncrement) {
	game.enemies.forEach(function (enemy) {
		enemy.speed += 1;
	});
	game.enemySpeedIncrement += 0.75;
};
game.updateTowerButtons = function () {
	game.towers.forEach(function (tower) {
		var canAffordUpgrade = game.coins >= tower.upgradeCost;
		if (tower.BuyBtn) {
			tower.BuyBtn.visible = canAffordUpgrade;
		}
		tower.towerCostText.alpha = canAffordUpgrade ? 1 : 0.5;
		console.log('Current coin count: ' + game.coins + ', Upgrade cost for tower: ' + tower.upgradeCost);
	});
};
game.removeEnemy = function (enemy) {
	game.enemies = game.enemies.filter(function (e) {
		return e !== enemy;
	});
	game.updateTowerButtons();
};
var background = game.attachAsset('background', {});
background.width = 2048;
background.height = 2732;
var GUI = game.attachAsset('GUI', {
	anchorX: 0.5,
	anchorY: 0.5
});
GUI.x = 1024;
GUI.y = 3650;
game.addChild(GUI);
var Kills = game.attachAsset('kills', {
	anchorX: 0.5,
	anchorY: 0.5
});
Kills.x = 1024;
Kills.y = 1366;
game.addChild(Kills);
game.Kills = Kills;
game.Kills.x = 1940;
game.Kills.y = 2620;
var Coin = game.attachAsset('coin', {
	anchorX: 0.5,
	anchorY: 0.5
});
Coin.x = 124;
Coin.y = 2620;
game.addChild(Coin);
game.GUI = GUI;
game.coins = 0;
game.coinDisplay = new Text2('0', {
	size: 100,
	fill: "#ffffff",
	align: 'center',
	stroke: '#000000',
	strokeThickness: 10
});
game.coinDisplay.anchor.set(0, 1);
game.coinDisplay.x = 150;
game.coinDisplay.y = -5;
LK.gui.bottomLeft.addChild(game.coinDisplay);
game.scoreDisplay = new Text2('0', {
	size: 100,
	fill: '#ffffff',
	align: 'center',
	stroke: '#000000',
	strokeThickness: 10
});
game.scoreDisplay.anchor.set(1, 1);
game.scoreDisplay.x = 1290;
game.scoreDisplay.y = -5;
LK.gui.bottomLeft.addChild(game.scoreDisplay);
game.removeCoinDisplay = function () {
	LK.gui.removeChild(game.coinDisplay);
};
game.incrementScore = function () {
	game.score++;
	LK.setScore(game.score);
	game.scoreDisplay.setText(LK.getScore().toString());
};
var towerCost = 10;
game.updateCoins = function (coinIncrement) {
	game.coins += coinIncrement;
	game.coinDisplay.setText(game.coins.toString());
	game.towers.forEach(function (tower) {
		var canAffordUpgrade = game.coins >= tower.upgradeCost;
		tower.BuyBtn.visible = canAffordUpgrade;
		tower.towerCostText.alpha = canAffordUpgrade ? 1 : 0.5;
	});
	if (game.tower) {
		game.towerButton.alpha = 1;
	}
};
game.enemies = [];
var base = game.addChild(new Base());
game.bullets = [];
game.enemySpeedIncrement = 0;
game.enemyRewardIncrement = 0;
game.score = 0;
game.snowballSpeed = 7;
game.initializeTower = function (x, y) {
	var tower = game.addChild(new Tower(game));
	tower.x = x;
	tower.y = y;
	tower.scale.x = 1;
	tower.scale.y = 1;
	tower.alpha = 1;
	if (tower.x < 0) {
		tower.x = 0;
	}
	if (tower.y < 0) {
		tower.y = 0;
	}
	if (tower.x > 2048) {
		tower.x = 2048 - tower.width;
	}
	if (tower.y > 2732) {
		tower.y = 2732 - tower.height;
	}
	tower.BuyBtn = LK.getAsset('buyButton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	tower.BuyBtn.x = tower.x - 140;
	tower.BuyBtn.y = tower.y + tower.height / 2 + 80;
	var towerButton = LK.getAsset('towerButton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	towerButton.x = tower.BuyBtn.x;
	towerButton.y = tower.BuyBtn.y;
	tower.BuyBtn.visible = false;
	var towerButton = LK.getAsset('towerButton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	towerButton.x = tower.BuyBtn.x;
	towerButton.y = tower.BuyBtn.y;
	game.addChild(towerButton);
	game.addChild(tower.BuyBtn);
	tower.BuyBtn.on('down', function () {
		this.upgrade();
	}.bind(tower));
	var towerCostText = new Text2(tower.upgradeCost.toString(), {
		size: 100,
		fill: "#ffffff",
		align: 'center',
		stroke: '#000000',
		strokeThickness: 10
	});
	towerCostText.anchor.set(0.5, 0.5);
	towerCostText.x = tower.BuyBtn.x;
	towerCostText.y = tower.BuyBtn.y;
	towerCostText.alpha = 0.5;
	tower.towerCostText = towerCostText;
	game.addChild(towerCostText);
	return tower;
};
var towerCenterX = 2048 / 2;
var towerCenterY = 2732 / 2 + 200;
game.towers = [game.initializeTower(towerCenterX - 700, towerCenterY + 650), game.initializeTower(towerCenterX - 700, towerCenterY + 250), game.initializeTower(towerCenterX - 700, towerCenterY - 150), game.initializeTower(towerCenterX - 700, towerCenterY - 550), game.initializeTower(towerCenterX - 700, towerCenterY - 950)];
base.x = 2048 / 2;
base.y = 2732 - base.height / 2;
game.enemyLayer = new Container();
game.addChild(game.enemyLayer);
var spawner1 = new Spawner(2048 / 6 + 200, -200);
var spawner2 = new Spawner(2048 / 2 + 100, -200);
var spawner3 = new Spawner(2048 / 6 * 5, -200);
game.addChild(spawner1);
game.addChild(spawner2);
game.addChild(spawner3);
var spawner1Timer = LK.setInterval(function () {
	spawner1.spawnEnemy();
}, 3000);
spawner1.spawnEnemy();
var spawner2Timer = LK.setInterval(function () {
	spawner2.spawnEnemy();
}, 2500);
spawner2.spawnEnemy();
var spawner3Timer = LK.setInterval(function () {
	spawner3.spawnEnemy();
}, 2000);
spawner3.spawnEnemy();
LK.on('tick', function () {
	game.enemies.forEach(function (enemy) {
		enemy._move_migrated();
		if (enemy.y >= game.GUI.y - 1250) {
			game.removeCoinDisplay();
			LK.showGameOver();
		}
	});
	game.bullets.forEach(function (snowball) {
		snowball._move_migrated();
		snowball.x += snowball.speed;
		game.enemies.forEach(function (enemy) {
			if (snowball.intersects(enemy)) {
				enemy.destroyEnemy();
				var tower = game.towers.find(function (t) {
					return t.activeSnowball === snowball;
				});
				if (tower) {
					tower.onSnowballDestroyed(snowball);
				}
				game.bullets = game.bullets.filter(function (b) {
					return b !== snowball;
				});
				snowball.destroy();
			}
		});
		if (snowball.x > 2048) {
			var tower = game.towers.find(function (t) {
				return t.activeSnowball === snowball;
			});
			if (tower) {
				tower.onSnowballDestroyed(snowball);
			}
			game.bullets = game.bullets.filter(function (b) {
				return b !== snowball;
			});
			snowball.destroy();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -209,8 +209,9 @@
 	};
 	self.upgrade = function () {
 		if (this.gameInstance.coins >= this.upgradeCost) {
 			this.gameInstance.coins -= this.upgradeCost;
+			LK.getSound('Buy').play(); // Play the Buy sound
 			this.gameInstance.updateCoins(0);
 			this.level++;
 			if (this.level === 2) {
 				this.isActive = true;