===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,236 @@
-/****
+/**** 
+* Classes
+****/ 
+var ControlButton = Container.expand(function (type) {
+	var self = Container.call(this);
+	self.buttonType = type;
+	self.isPressed = false;
+	var buttonGraphics;
+	if (type === 'jump') {
+		buttonGraphics = self.attachAsset('jumpButton', {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
+	} else {
+		buttonGraphics = self.attachAsset(type === 'left' ? 'leftButton' : 'rightButton', {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
+	}
+	self.down = function (x, y, obj) {
+		self.isPressed = true;
+		buttonGraphics.alpha = 0.7;
+	};
+	self.up = function (x, y, obj) {
+		self.isPressed = false;
+		buttonGraphics.alpha = 1.0;
+	};
+	return self;
+});
+var Platform = Container.expand(function (width, height) {
+	var self = Container.call(this);
+	self.platformWidth = width || 300;
+	self.platformHeight = height || 40;
+	var platformGraphics = self.attachAsset('platform', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: self.platformWidth / 300,
+		scaleY: self.platformHeight / 40
+	});
+	return self;
+});
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var playerGraphics = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
+	self.velocityX = 0;
+	self.velocityY = 0;
+	self.speed = 8;
+	self.jumpPower = 20;
+	self.gravity = 0.8;
+	self.onGround = false;
+	self.maxFallSpeed = 15;
+	self.moveLeft = function () {
+		self.velocityX = -self.speed;
+	};
+	self.moveRight = function () {
+		self.velocityX = self.speed;
+	};
+	self.jump = function () {
+		if (self.onGround) {
+			self.velocityY = -self.jumpPower;
+			self.onGround = false;
+		}
+	};
+	self.stopHorizontalMovement = function () {
+		self.velocityX = 0;
+	};
+	self.update = function () {
+		// Apply gravity
+		self.velocityY += self.gravity;
+		// Limit fall speed
+		if (self.velocityY > self.maxFallSpeed) {
+			self.velocityY = self.maxFallSpeed;
+		}
+		// Update position
+		self.x += self.velocityX;
+		self.y += self.velocityY;
+		// Keep player within screen bounds horizontally
+		if (self.x < 40) {
+			self.x = 40;
+		}
+		if (self.x > 2008) {
+			self.x = 2008;
+		}
+		// Reset onGround flag
+		self.onGround = false;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87ceeb
+});
+
+/**** 
+* Game Code
+****/ 
+var player = game.addChild(new Player());
+player.x = 1024;
+player.y = 2500;
+var platforms = [];
+var ground = game.addChild(LK.getAsset('ground', {
+	anchorX: 0.5,
+	anchorY: 1.0
+}));
+ground.x = 1024;
+ground.y = 2732;
+// Create platforms
+var platformData = [{
+	x: 400,
+	y: 2400,
+	width: 200
+}, {
+	x: 800,
+	y: 2200,
+	width: 250
+}, {
+	x: 1200,
+	y: 2000,
+	width: 200
+}, {
+	x: 600,
+	y: 1800,
+	width: 300
+}, {
+	x: 1400,
+	y: 1600,
+	width: 200
+}, {
+	x: 300,
+	y: 1400,
+	width: 250
+}, {
+	x: 1000,
+	y: 1200,
+	width: 300
+}, {
+	x: 1600,
+	y: 1000,
+	width: 200
+}];
+for (var i = 0; i < platformData.length; i++) {
+	var platformInfo = platformData[i];
+	var platform = game.addChild(new Platform(platformInfo.width));
+	platform.x = platformInfo.x;
+	platform.y = platformInfo.y;
+	platforms.push(platform);
+}
+// Control buttons
+var leftButton = LK.gui.bottomLeft.addChild(new ControlButton('left'));
+leftButton.x = 80;
+leftButton.y = -80;
+var rightButton = LK.gui.bottomLeft.addChild(new ControlButton('right'));
+rightButton.x = 220;
+rightButton.y = -80;
+var jumpButton = LK.gui.bottomRight.addChild(new ControlButton('jump'));
+jumpButton.x = -80;
+jumpButton.y = -80;
+// Control button labels
+var leftLabel = new Text2('←', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+leftLabel.anchor.set(0.5, 0.5);
+leftButton.addChild(leftLabel);
+var rightLabel = new Text2('→', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+rightLabel.anchor.set(0.5, 0.5);
+rightButton.addChild(rightLabel);
+var jumpLabel = new Text2('↑', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+jumpLabel.anchor.set(0.5, 0.5);
+jumpButton.addChild(jumpLabel);
+function checkCollisions() {
+	var playerBottom = player.y;
+	var playerTop = player.y - 80;
+	var playerLeft = player.x - 40;
+	var playerRight = player.x + 40;
+	// Check ground collision
+	if (playerBottom >= ground.y - 50) {
+		if (player.velocityY > 0) {
+			player.y = ground.y - 50;
+			player.velocityY = 0;
+			player.onGround = true;
+		}
+	}
+	// Check platform collisions
+	for (var i = 0; i < platforms.length; i++) {
+		var platform = platforms[i];
+		var platformLeft = platform.x - platform.platformWidth / 2;
+		var platformRight = platform.x + platform.platformWidth / 2;
+		var platformTop = platform.y - platform.platformHeight / 2;
+		var platformBottom = platform.y + platform.platformHeight / 2;
+		// Check if player is horizontally aligned with platform
+		if (playerRight > platformLeft && playerLeft < platformRight) {
+			// Check if player is falling onto platform from above
+			if (player.velocityY > 0 && playerBottom >= platformTop && playerTop < platformTop) {
+				player.y = platformTop;
+				player.velocityY = 0;
+				player.onGround = true;
+			}
+		}
+	}
+}
+game.update = function () {
+	// Handle input
+	if (leftButton.isPressed) {
+		player.moveLeft();
+	} else if (rightButton.isPressed) {
+		player.moveRight();
+	} else {
+		player.stopHorizontalMovement();
+	}
+	if (jumpButton.isPressed) {
+		player.jump();
+	}
+	// Check collisions
+	checkCollisions();
+	// Check if player fell off screen
+	if (player.y > 2800) {
+		// Reset player position
+		player.x = 1024;
+		player.y = 2500;
+		player.velocityX = 0;
+		player.velocityY = 0;
+	}
+};
\ No newline at end of file