===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,201 @@
-/****
+/**** 
+* Classes
+****/ 
+// Obstacle class: a single green box (top or bottom pipe)
+var Obstacle = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach green box asset, anchor top left
+	var obstacleAsset = self.attachAsset('centerCircle', {
+		anchorX: 0,
+		anchorY: 0
+	});
+	// Set width and height for the obstacle
+	obstacleAsset.width = 200;
+	obstacleAsset.height = 900;
+	// For collision
+	self.lastX = self.x;
+	// Update method (move left)
+	self.update = function () {
+		self.lastX = self.x;
+		self.x -= obstacleSpeed;
+	};
+	return self;
+});
+// ObstaclePair class: a pair of obstacles with a gap
+var ObstaclePair = Container.expand(function () {
+	var self = Container.call(this);
+	// Gap size and vertical position
+	var gapSize = 500;
+	var minY = 400;
+	var maxY = 2732 - 400 - gapSize;
+	var gapY = minY + Math.floor(Math.random() * (maxY - minY));
+	// Top obstacle
+	self.top = new Obstacle();
+	self.top.y = 0;
+	self.top.x = 0;
+	self.top.height = gapY;
+	// Bottom obstacle
+	self.bottom = new Obstacle();
+	self.bottom.y = gapY + gapSize;
+	self.bottom.x = 0;
+	self.bottom.height = 2732 - (gapY + gapSize);
+	// Add to pair
+	self.addChild(self.top);
+	self.addChild(self.bottom);
+	// For scoring
+	self.passed = false;
+	self.lastX = self.x;
+	// Update method (move left, update children)
+	self.update = function () {
+		self.lastX = self.x;
+		self.x -= obstacleSpeed;
+	};
+	return self;
+});
+// --- Flappy Box Main Game Logic ---
+// Game constants
+// Player class: the red box that jumps and falls with gravity
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach red box asset, centered
+	var playerAsset = self.attachAsset('character', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Physics properties
+	self.y = 1366; // Start vertically centered
+	self.x = 600; // Start horizontally at 600px
+	self.vy = 0; // Vertical velocity
+	self.gravity = 2.2; // Gravity per frame
+	self.jumpStrength = -38; // Upward velocity on jump
+	// For collision and scoring
+	self.lastY = self.y;
+	// Jump method
+	self.jump = function () {
+		self.vy = self.jumpStrength;
+	};
+	// Update method (called every frame)
+	self.update = function () {
+		self.lastY = self.y;
+		self.vy += self.gravity;
+		self.y += self.vy;
+		// Prevent player from rotating (keep upright)
+		playerAsset.rotation = 0;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
 	backgroundColor: 0x000000
-});
\ No newline at end of file
+});
+
+/**** 
+* Game Code
+****/ 
+// Game constants
+// --- Flappy Box Main Game Logic ---
+var obstacleSpeed = 16; // Speed at which obstacles move left
+var obstacleInterval = 120; // Frames between obstacle pairs
+var gapSize = 500; // Vertical gap between obstacles
+// Game state
+var player;
+var obstacles = [];
+var score = 0;
+var scoreText;
+var gameStarted = false;
+var lastObstacleTick = 0;
+// Add score text to GUI
+scoreText = new Text2('0', {
+	size: 150,
+	fill: 0xFFFFFF
+});
+scoreText.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreText);
+// Start the game
+function startGame() {
+	// Reset state
+	for (var i = 0; i < obstacles.length; i++) {
+		obstacles[i].destroy();
+	}
+	obstacles = [];
+	score = 0;
+	scoreText.setText(score);
+	gameStarted = true;
+	lastObstacleTick = 0;
+	// Create player
+	if (player) player.destroy();
+	player = new Player();
+	player.x = 600;
+	player.y = 1366;
+	game.addChild(player);
+}
+// Handle tap to jump
+game.down = function (x, y, obj) {
+	if (!gameStarted) {
+		startGame();
+	}
+	if (player) {
+		player.jump();
+	}
+};
+// Main update loop
+game.update = function () {
+	if (!gameStarted) return;
+	// Update player
+	if (player) player.update();
+	// Add new obstacles
+	if (LK.ticks - lastObstacleTick > obstacleInterval) {
+		var pair = new ObstaclePair();
+		pair.x = 2048;
+		game.addChild(pair);
+		obstacles.push(pair);
+		lastObstacleTick = LK.ticks;
+	}
+	// Update obstacles and check for passed/cleanup
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		var pair = obstacles[i];
+		pair.update();
+		// Check for scoring (player passes obstacle)
+		if (!pair.passed && player.x > pair.x + 200) {
+			pair.passed = true;
+			score += 1;
+			scoreText.setText(score);
+		}
+		// Remove obstacles off screen
+		if (pair.x < -300) {
+			pair.destroy();
+			obstacles.splice(i, 1);
+		}
+	}
+	// Collision detection
+	for (var i = 0; i < obstacles.length; i++) {
+		var pair = obstacles[i];
+		// Check collision with top
+		if (player.intersects(pair.top)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			gameStarted = false;
+			return;
+		}
+		// Check collision with bottom
+		if (player.intersects(pair.bottom)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			gameStarted = false;
+			return;
+		}
+	}
+	// Check collision with top/bottom of screen
+	if (player.y < 0 || player.y > 2732) {
+		LK.effects.flashScreen(0xff0000, 800);
+		LK.showGameOver();
+		gameStarted = false;
+		return;
+	}
+};
+// Start in idle state
+gameStarted = false;
+scoreText.setText('0');
\ No newline at end of file