===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,123 @@
-/****
+/**** 
+* Classes
+****/ 
+var Fly = Container.expand(function () {
+	var self = Container.call(this);
+	var flyGraphics = self.attachAsset('fly', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.velocity = 0;
+	self.gravity = 0.8;
+	self.jumpPower = -15;
+	self.jump = function () {
+		self.velocity = self.jumpPower;
+		LK.getSound('jump').play();
+	};
+	self.update = function () {
+		self.velocity += self.gravity;
+		self.y += self.velocity;
+		// Prevent fly from going off screen
+		if (self.y < 50) {
+			self.y = 50;
+			self.velocity = 0;
+		}
+		if (self.y > 2680) {
+			self.y = 2680;
+			self.velocity = 0;
+		}
+	};
+	return self;
+});
+var ObstaclePair = Container.expand(function () {
+	var self = Container.call(this);
+	var gapSize = 300;
+	var gapPosition = Math.random() * 1000 + 600; // Random gap between 600-1600
+	var topObstacle = self.attachAsset('obstacleTop', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	topObstacle.y = gapPosition - gapSize / 2;
+	var bottomObstacle = self.attachAsset('obstacleBottom', {
+		anchorX: 0.5,
+		anchorY: 0
+	});
+	bottomObstacle.y = gapPosition + gapSize / 2;
+	self.speed = -5;
+	self.scored = false;
+	self.update = function () {
+		self.x += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87CEEB
+});
+
+/**** 
+* Game Code
+****/ 
+var fly = game.addChild(new Fly());
+fly.x = 300;
+fly.y = 1366;
+var obstacles = [];
+var lastObstacleX = 2048;
+var scoreTxt = new Text2('0', {
+	size: 100,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+scoreTxt.y = 100;
+// Spawn obstacles
+function spawnObstacle() {
+	var obstacle = new ObstaclePair();
+	obstacle.x = lastObstacleX + 600;
+	obstacles.push(obstacle);
+	game.addChild(obstacle);
+	lastObstacleX = obstacle.x;
+}
+// Initial obstacles
+spawnObstacle();
+spawnObstacle();
+spawnObstacle();
+game.down = function (x, y, obj) {
+	fly.jump();
+};
+game.update = function () {
+	// Spawn new obstacles when needed
+	if (obstacles.length > 0 && obstacles[obstacles.length - 1].x < 1500) {
+		spawnObstacle();
+	}
+	// Check collisions and scoring
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		var obstacle = obstacles[i];
+		// Remove obstacles that are off screen
+		if (obstacle.x < -200) {
+			obstacle.destroy();
+			obstacles.splice(i, 1);
+			continue;
+		}
+		// Check for scoring
+		if (!obstacle.scored && obstacle.x < fly.x) {
+			obstacle.scored = true;
+			LK.setScore(LK.getScore() + 1);
+			scoreTxt.setText(LK.getScore());
+			LK.getSound('score').play();
+		}
+		// Check for collision
+		if (fly.intersects(obstacle)) {
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Check if fly hits ground or ceiling
+	if (fly.y >= 2680 || fly.y <= 50) {
+		LK.showGameOver();
+		return;
+	}
+};
\ No newline at end of file