var Enemy_3 = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.gameInstance = gameInstance;
	var enemyGraphics = self.createAsset('enemy_3', 'Enemy_3 Graphics', .5, .5);
	self.speed = 7;
	self.move = function () {
		self.y += self.speed;
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.destroy();
		self.gameInstance.updateCoins(5);
		self.gameInstance.removeEnemy(self);
	};
});
var Enemy = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.gameInstance = gameInstance;
	var enemyGraphics = self.createAsset('enemy', 'Enemy Graphics', .5, .5);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.destroy();
		self.gameInstance.updateCoins(5);
		self.gameInstance.removeEnemy(self);
	};
});
var Tower = Container.expand(function (gameInstance) {
	var self = Container.call(this);
	self.activeSnowball = null;
	self.gameInstance = gameInstance;
	self.isActive = false;
	self.level = 1;
	self.upgradeCost = 10;
	self.snowballSpeed = 5;
	self.activationCost = 10;
	self.BuyBtn = null;
	self.shootSnowball = function () {
		if (self.isActive && !self.gameInstance.isGameOver && self.activeSnowball === null) {
			var snowball = new Snowball(self.snowballSpeed, self.x, self.y, self.x, self.y);
			self.activeSnowball = snowball;
			snowball.on('destroyed', self.onSnowballDestroyed);
			self.gameInstance.bullets.push(snowball);
			self.gameInstance.enemyLayer.addChild(snowball);
		}
	};
	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;
			this.gameInstance.updateCoins(0);
			this.level++;
			if (this.level === 2) {
				this.isActive = true;
				this.scheduleNextSnowball();
			}
			if (this.level > 2) {
				this.snowballSpeed++;
				this.gameInstance.bullets.forEach((function (bullet) {
					if (bullet instanceof Snowball && bullet.speed < this.snowballSpeed) {
						bullet.speed = this.snowballSpeed;
					}
				}).bind(this));
			}
			this.upgradeCost += 5;
			this.towerCostText.setText(this.upgradeCost.toString());
		}
		if (this.BuyBtn) {
			this.BuyBtn.visible = this.gameInstance.coins >= this.upgradeCost;
			this.towerCostText.alpha = this.gameInstance.coins >= this.upgradeCost ? 1 : 0.5;
		} else {
			this.towerCostText.alpha = 0.5;
		}
	};
});
var Snowball = Container.expand(function (speed) {
	var self = Container.call(this);
	self.x = arguments[1];
	self.y = arguments[2];
	self.speed = speed;
	self.x = arguments[3];
	self.y = arguments[4];
	var snowballGraphics = self.createAsset('snowball', 'Snowball Graphics', .5, .5);
	self.speed = speed;
});
var Base = Container.expand(function () {
	var self = Container.call(this);
	self.health = 100;
	self.updateHealth = function () {};
});
var Enemy_2 = Container.expand(function (spawnerInstance, gameInstance) {
	var self = Container.call(this);
	self.gameInstance = gameInstance;
	var enemyGraphics = self.createAsset('enemy_2', 'Enemy_2 Graphics', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
	self.on('down', function () {
		self.destroyEnemy();
	});
	self.destroyEnemy = function () {
		self.destroy();
		self.gameInstance.updateCoins(5);
		self.gameInstance.removeEnemy(self);
	};
});
var Spawner = Container.expand(function (x, y) {
	var self = Container.call(this);
	var spawnerGraphics = self.createAsset('spawner', 'Spawner Graphics', .5, .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);
				break;
			case 'Enemy_2':
				enemy = new Enemy_2(self, self.parent);
				break;
			case 'Enemy_3':
				enemy = new Enemy_3(self, self.parent);
				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 Game = Container.expand(function () {
	var self = Container.call(this);
	self.updateTowerButtons = function () {
		self.towers.forEach(function (tower) {
			var canAffordUpgrade = self.coins >= tower.upgradeCost;
			if (tower.BuyBtn) tower.BuyBtn.visible = canAffordUpgrade;
			tower.towerCostText.alpha = canAffordUpgrade ? 1 : 0.5;
			console.log('Current coin count: ' + self.coins + ', Upgrade cost for tower: ' + tower.upgradeCost);
		});
	};
	self.removeEnemy = function (enemy) {
		self.enemies = self.enemies.filter(function (e) {
			return e !== enemy;
		});
		self.updateTowerButtons();
	};
	var background = self.createAsset('background', 'Game Background', 0, 0);
	background.width = LK.stage.width;
	background.height = LK.stage.height;
	var GUI = self.createAsset('GUI', 'GUI Asset', 0.5, 0.5);
	GUI.x = 1024;
	GUI.y = 3650;
	self.addChild(GUI);
	var Coin = self.createAsset('coin', 'Coin Asset', 0.5, 0.5);
	Coin.x = 124;
	Coin.y = 2620;
	self.addChild(Coin);
	self.GUI = GUI;
	self.coins = 0;
	self.coinDisplay = new Text2('0', {
		size: 100,
		fill: "#ffffff",
		align: 'center',
		stroke: '#000000',
		strokeThickness: 6
	});
	self.coinDisplay.anchor.set(0, 0.5);
	self.coinDisplay.x = 170;
	self.coinDisplay.y = 1840;
	LK.gui.addChild(self.coinDisplay);
	self.removeCoinDisplay = function () {
		LK.gui.removeChild(self.coinDisplay);
	};
	var towerCost = 10;
	LK.gui.addChild(self.towerCostText);
	self.updateCoins = function (coinIncrement) {
		self.coins += coinIncrement;
		self.coinDisplay.setText(self.coins.toString());
		self.towers.forEach(function (tower) {
			var canAffordUpgrade = self.coins >= tower.upgradeCost;
			tower.BuyBtn.visible = canAffordUpgrade;
			tower.towerCostText.alpha = canAffordUpgrade ? 1 : 0.5;
		});
		var towerButton = LK.getAsset('towerButton', 'Tower Button Asset', 0.5, 0.5);
		towerButton.x = tower.x;
		towerButton.y = tower.y - tower.height / 2 - 160;
		LK.gui.addChild(towerButton);
		tower.towerButton = towerButton;
	};
	self.enemies = [];
	var base = self.addChild(new Base());
	self.bullets = [];
	self.snowballSpeed = 7;
	self.initializeTower = function (x, y) {
		var tower = self.addChild(new Tower(self));
		tower.x = x;
		tower.y = y;
		tower.scale.x = 8;
		tower.scale.y = 8;
		tower.BuyBtn = LK.getAsset('buyButton', 'Buy Button', 0.5, 0.5);
		tower.BuyBtn.x = tower.x - 140;
		tower.BuyBtn.y = tower.y - tower.height / 2 - 80;
		tower.BuyBtn.visible = false;
		LK.gui.addChild(tower.BuyBtn);
		tower.BuyBtn.on('down', (function () {
			this.upgrade();
		}).bind(tower));
		tower.towerButton = LK.getAsset('towerButton', 'Tower Button Asset', 0.5, 0.5);
		tower.towerButton.x = tower.x;
		tower.towerButton.y = tower.y - tower.BuyBtn.height / 2 - 160;
		LK.gui.addChild(tower.towerButton);
		var towerCostText = new Text2(tower.upgradeCost.toString(), {
			size: 70,
			fill: "#ffffff",
			align: 'center',
			stroke: '#000000',
			strokeThickness: 8
		});
		towerCostText.anchor.set(0.5, 0.5);
		towerCostText.x = tower.BuyBtn.x;
		towerCostText.y = tower.BuyBtn.y - 100;
		towerCostText.alpha = 1;
		tower.towerCostText = towerCostText;
		LK.gui.addChild(towerCostText);
		return tower;
	};
	var towerCenterX = LK.stage.width / 2;
	var towerCenterY = LK.stage.height / 2;
	self.towers = [self.initializeTower(towerCenterX - 750, towerCenterY + 300), self.initializeTower(towerCenterX - 750, towerCenterY), self.initializeTower(towerCenterX - 750, towerCenterY - 300), self.initializeTower(towerCenterX - 750, towerCenterY - 600), self.initializeTower(towerCenterX - 750, towerCenterY - 900)];
	base.x = 2048 / 2;
	base.y = 2732 - base.height / 2;
	self.enemyLayer = new Container();
	self.addChild(self.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);
	self.addChild(spawner1);
	self.addChild(spawner2);
	self.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 () {
		self.enemies.forEach(function (enemy) {
			enemy.move();
			if (enemy.y + enemy.height / 2 >= LK.stage.height) {
				self.removeCoinDisplay();
				LK.showGameOver();
			}
		});
		self.bullets.forEach(function (snowball) {
			snowball.x += snowball.speed;
			self.enemies.forEach(function (enemy) {
				if (snowball.intersects(enemy)) {
					enemy.destroyEnemy();
					var tower = self.towers.find(function (t) {
						return t.activeSnowball === snowball;
					});
					if (tower) tower.onSnowballDestroyed(snowball);
					self.bullets = self.bullets.filter(function (b) {
						return b !== snowball;
					});
					snowball.destroy();
				}
			});
			if (snowball.x > LK.stage.width) {
				var tower = self.towers.find(function (t) {
					return t.activeSnowball === snowball;
				});
				if (tower) tower.onSnowballDestroyed(snowball);
				self.bullets = self.bullets.filter(function (b) {
					return b !== snowball;
				});
				snowball.destroy();
			}
		});
	});
});

===================================================================
--- original.js
+++ change.js
@@ -220,12 +220,13 @@
 			var canAffordUpgrade = self.coins >= tower.upgradeCost;
 			tower.BuyBtn.visible = canAffordUpgrade;
 			tower.towerCostText.alpha = canAffordUpgrade ? 1 : 0.5;
 		});
-		tower.towerButton = LK.getAsset('towerButton', 'Tower Button Asset', 0.5, 0.5);
-		tower.towerButton.x = tower.x;
-		tower.towerButton.y = tower.y - tower.height / 2 - 160;
-		LK.gui.addChild(tower.towerButton);
+		var towerButton = LK.getAsset('towerButton', 'Tower Button Asset', 0.5, 0.5);
+		towerButton.x = tower.x;
+		towerButton.y = tower.y - tower.height / 2 - 160;
+		LK.gui.addChild(towerButton);
+		tower.towerButton = towerButton;
 	};
 	self.enemies = [];
 	var base = self.addChild(new Base());
 	self.bullets = [];