var foxTimeout;
var Guard = Container.expand(function () {
	var self = Container.call(this);
	var guardGraphics = self.createAsset('guard', 'Guard Graphics', .5, .5);
	self.foxesCaught = 0;
	self.catchLimit = 10;
	self.catchFox = function (fox) {
		fox.destroy();
		self.foxesCaught++;
		if (self.foxesCaught >= self.catchLimit) {
			self.destroy();
		}
	};
	self.update = function () {};
});
var Fox = Container.expand(function (speedIncrement) {
	var self = Container.call(this);
	var foxGraphics = self.createAsset('fox', 'Fox Graphics', .5, .5);
	self.speed = 1;
	self.interactive = true;
	self.buttonMode = true;
	self.on('down', function () {
		var guards = LK.stage.children.filter(function (child) {
			return child instanceof Guard;
		});
		if (guards.length > 0) {
			var closestGuard = guards.reduce(function (prev, curr) {
				var prevDistance = Math.sqrt(Math.pow(prev.x - self.x, 2) + Math.pow(prev.y - self.y, 2));
				var currDistance = Math.sqrt(Math.pow(curr.x - self.x, 2) + Math.pow(curr.y - self.y, 2));
				return prevDistance < currDistance ? prev : curr;
			});
			closestGuard.catchFox(self);
		} else {
			LK.clearTimeout(foxTimeout);
			self.destroy();
		}
	});
	self.stealMoney = function () {
		if (LK.getScore() >= 100) {
			LK.setScore(LK.getScore() - 100);
		}
		self.destroy();
	};
	self.update = function () {
		self.y += self.speed;
	};
	Fox.speedIncrement = speedIncrement || 0.5;
});
var GiftDecoration = Container.expand(function () {
	var self = Container.call(this);
	var giftDecorationGraphics = self.createAsset('giftDecoration', 'Gift Decoration Graphics', .5, .5);
	self.update = function () {};
});
var ChristmasTree = Container.expand(function () {
	var self = Container.call(this);
	var treeGraphics = self.createAsset('christmasTree', 'Christmas Tree Graphics', .5, .5);
	self.update = function () {};
});
var Gift = Container.expand(function () {
	var self = Container.call(this);
	var giftGraphics = self.createAsset('gift', 'Gift Graphics', .5, .5);
	self.move = function () {};
	self.update = function () {};
});
var Santa = Container.expand(function () {
	var self = Container.call(this);
	var santaGraphics = self.createAsset('santa', 'Santa Graphics', .5, .5);
	self.move = function () {};
	self.update = function () {};
});
var Factory = Container.expand(function () {
	var self = Container.call(this);
	var factoryGraphics = self.createAsset('factory', 'Factory Graphics', .5, .5);
	self.productionValue = 5;
	self.upgradeCost = 1000;
	self.produceGift = function () {
		LK.setInterval(function () {
			LK.setScore(LK.getScore() + self.productionValue);
		}, 1000);
	};
	self.upgradeFactory = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.productionValue *= 2;
			self.upgradeCost *= 2;
		}
	};
	self.upgradeFactory = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.productionValue *= 2;
			self.upgradeCost *= 2;
		}
	};
	self.terrainUpgrades = [];
	self.upgradeTerrain = function () {
		self.terrainUpgradeCost = self.terrainUpgradeCost || 50;
		if (LK.getScore() >= self.terrainUpgradeCost) {
			LK.setScore(LK.getScore() - self.terrainUpgradeCost);
			var newUpgrade;
			if (Math.random() < 0.5) {
				newUpgrade = new ChristmasTree();
			} else {
				newUpgrade = new GiftDecoration();
			}
			newUpgrade.x = Math.random() * 2048;
			newUpgrade.y = Math.random() * 2732;
			self.terrainUpgrades.push(newUpgrade);
			LK.stage.addChild(newUpgrade);
			self.terrainUpgradeCost *= 2;
		}
	};
	self.update = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var gifts = [];
	var factories = [];
	var santa = self.addChild(new Santa());
	santa.x = 2048 / 2;
	santa.y = 2732 / 2;
	var factory = self.addChild(new Factory());
	factory.x = 2048 / 4;
	factory.y = 2732 / 4;
	factories.push(factory);
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	var purchaseFactoryButton = self.createAsset('purchaseFactoryButton', 'Purchase Factory Button', 0.5, 1);
	var purchaseGuardButton = self.createAsset('purchaseGuardButton', 'Purchase Guard Button', 0.5, 1);
	purchaseGuardButton.x = 2048 / 2;
	purchaseGuardButton.y = 2732 - purchaseGuardButton.height * 1.5;
	self.addChild(purchaseGuardButton);
	purchaseGuardButton.on('down', function () {
		var guardCost = 1000;
		if (LK.getScore() >= guardCost) {
			LK.setScore(LK.getScore() - guardCost);
			var newGuard = self.addChild(new Guard());
			newGuard.x = Math.random() * 2048;
			newGuard.y = Math.random() * 2732;
		}
	});
	var upgradeTerrainButton = self.createAsset('upgradeTerrainButton', 'Upgrade Terrain Button', 0.5, 1);
	purchaseFactoryButton.x = 2048 / 2 - purchaseFactoryButton.width;
	purchaseFactoryButton.y = 2732 - purchaseFactoryButton.height / 2;
	upgradeTerrainButton.x = 2048 / 2 + upgradeTerrainButton.width;
	upgradeTerrainButton.y = 2732 - upgradeTerrainButton.height / 2;
	self.addChild(purchaseFactoryButton);
	self.addChild(upgradeTerrainButton);
	purchaseFactoryButton.on('down', function () {
		var factoryCost = 100;
		if (LK.getScore() >= factoryCost) {
			LK.setScore(LK.getScore() - factoryCost);
			var newFactory = self.addChild(new Factory());
			newFactory.x = 2048 / 4;
			newFactory.y = 2732 / 4 * factories.length;
			factories.push(newFactory);
			newFactory.produceGift();
			scoreTxt.setText(LK.getScore());
		} else {
			var noMoneyTxt = new Text2('No Money', {
				size: 100,
				fill: "#ff0000"
			});
			noMoneyTxt.x = LK.stage.width / 2;
			noMoneyTxt.y = LK.stage.height / 2;
			noMoneyTxt.anchor.set(0.5, 0.5);
			LK.gui.addChild(noMoneyTxt);
			LK.setTimeout(function () {
				noMoneyTxt.destroy();
			}, 5000);
		}
	});
	upgradeTerrainButton.on('down', function () {
		factory.upgradeTerrain();
		scoreTxt.setText(LK.getScore());
	});
	LK.setScore(5);
	scoreTxt.setText(0);
	var lastScore = 0;
	var foxTimeout;
	LK.on('tick', function () {
		var currentScore = LK.getScore();
		if (currentScore >= lastScore + 100) {
			lastScore += 100;
			var fox = new Fox(Fox.speedIncrement);
			fox.speed += Fox.speedIncrement;
			fox.x = Math.random() * 2048;
			fox.y = Math.random() * 2732;
			self.addChild(fox);
			foxTimeout = LK.setTimeout(function () {
				fox.stealMoney();
				scoreTxt.setText(LK.getScore());
			}, 5000);
		}
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	santa.on('down', function (obj) {
		console.log('Santa was pressed');
	});
	factory.on('down', function (obj) {
		var upgradeButton = self.createAsset('upgradeButton', 'Upgrade Factory Button', 0.5, 1);
		upgradeButton.x = factory.x + factory.getChildAt(0).width / 2 + 20;
		upgradeButton.y = factory.y;
		self.addChild(upgradeButton);
		upgradeButton.on('down', function () {
			self.upgradeFactory();
			scoreTxt.setText(LK.getScore());
			upgradeButton.destroy();
		});
		factory.produceGift();
		scoreTxt.setText(LK.getScore());
	});
	LK.on('tick', function () {
		santa.update();
		for (var i = 0; i < factories.length; i++) {
			factories[i].update();
		}
		for (var i = 0; i < gifts.length; i++) {
			gifts[i].move();
			if (gifts[i].y < -50) {
				gifts[i].destroy();
				gifts.splice(i, 1);
			}
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,14 +1,40 @@
 var foxTimeout;
+var Guard = Container.expand(function () {
+	var self = Container.call(this);
+	var guardGraphics = self.createAsset('guard', 'Guard Graphics', .5, .5);
+	self.foxesCaught = 0;
+	self.catchLimit = 10;
+	self.catchFox = function (fox) {
+		fox.destroy();
+		self.foxesCaught++;
+		if (self.foxesCaught >= self.catchLimit) {
+			self.destroy();
+		}
+	};
+	self.update = function () {};
+});
 var Fox = Container.expand(function (speedIncrement) {
 	var self = Container.call(this);
 	var foxGraphics = self.createAsset('fox', 'Fox Graphics', .5, .5);
 	self.speed = 1;
 	self.interactive = true;
 	self.buttonMode = true;
 	self.on('down', function () {
-		LK.clearTimeout(foxTimeout);
-		self.destroy();
+		var guards = LK.stage.children.filter(function (child) {
+			return child instanceof Guard;
+		});
+		if (guards.length > 0) {
+			var closestGuard = guards.reduce(function (prev, curr) {
+				var prevDistance = Math.sqrt(Math.pow(prev.x - self.x, 2) + Math.pow(prev.y - self.y, 2));
+				var currDistance = Math.sqrt(Math.pow(curr.x - self.x, 2) + Math.pow(curr.y - self.y, 2));
+				return prevDistance < currDistance ? prev : curr;
+			});
+			closestGuard.catchFox(self);
+		} else {
+			LK.clearTimeout(foxTimeout);
+			self.destroy();
+		}
 	});
 	self.stealMoney = function () {
 		if (LK.getScore() >= 100) {
 			LK.setScore(LK.getScore() - 100);
@@ -101,8 +127,21 @@
 		size: 150,
 		fill: "#ffffff"
 	});
 	var purchaseFactoryButton = self.createAsset('purchaseFactoryButton', 'Purchase Factory Button', 0.5, 1);
+	var purchaseGuardButton = self.createAsset('purchaseGuardButton', 'Purchase Guard Button', 0.5, 1);
+	purchaseGuardButton.x = 2048 / 2;
+	purchaseGuardButton.y = 2732 - purchaseGuardButton.height * 1.5;
+	self.addChild(purchaseGuardButton);
+	purchaseGuardButton.on('down', function () {
+		var guardCost = 1000;
+		if (LK.getScore() >= guardCost) {
+			LK.setScore(LK.getScore() - guardCost);
+			var newGuard = self.addChild(new Guard());
+			newGuard.x = Math.random() * 2048;
+			newGuard.y = Math.random() * 2732;
+		}
+	});
 	var upgradeTerrainButton = self.createAsset('upgradeTerrainButton', 'Upgrade Terrain Button', 0.5, 1);
 	purchaseFactoryButton.x = 2048 / 2 - purchaseFactoryButton.width;
 	purchaseFactoryButton.y = 2732 - purchaseFactoryButton.height / 2;
 	upgradeTerrainButton.x = 2048 / 2 + upgradeTerrainButton.width;