/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1");

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdSprite = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = birdSprite.width;
	self.height = birdSprite.height;
	self.vy = 0;
	self.gravity = 1.2;
	self.flapStrength = -22;
	self.alive = true;
	self.rotation = 0;
	self.flap = function () {
		if (!self.alive) return;
		self.vy = self.flapStrength;
		LK.getSound('flap').play();
	};
	self.die = function () {
		self.alive = false;
	};
	self.update = function () {
		// Always track lastY and lastX for event/collision tracking
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		self.lastY = self.y;
		self.lastX = self.x;
		if (!self.alive) return;
		self.vy += self.gravity;
		self.y += self.vy;
		// Clamp rotation between -0.5 and 1.0 radians
		var targetRot = Math.max(-0.5, Math.min(1.0, self.vy / 30));
		self.rotation += (targetRot - self.rotation) * 0.2;
	};
	return self;
});
// Cloud class
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	var cloudSprite = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2 + Math.random() * 2;
	self.update = function () {
		self.x -= self.speed;
	};
	self.isOffScreen = function () {
		return self.x < -cloudSprite.width / 2;
	};
	return self;
});
// PipePair class
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	self.passed = false;
	self.speed = 10;
	self.gap = 480; // vertical gap between pipes (increased for bigger pipes)
	self.pipeWidth = 208;
	self.pipeHeight = 1280;
	// Randomize gap position
	var minY = 400;
	var maxY = 2732 - 112 - 200 - self.gap; // leave space for ground
	var gapY = minY + Math.floor(Math.random() * (maxY - minY));
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1.0,
		x: 0,
		y: gapY
	});
	// Bottom pipe (flipped)
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.0,
		x: 0,
		y: gapY + self.gap,
		flipY: 1
	});
	self.topPipe = topPipe;
	self.bottomPipe = bottomPipe;
	self.width = self.pipeWidth;
	self.height = self.pipeHeight * 2 + self.gap;
	self.update = function () {
		self.x -= self.speed;
	};
	self.isOffScreen = function () {
		return self.x < -self.pipeWidth / 2;
	};
	self.checkPass = function (bird) {
		if (!self.passed && self.x + self.pipeWidth / 2 < bird.x) {
			self.passed = true;
			return true;
		}
		return false;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x70c5ce // Flappy Bird sky blue
});

/**** 
* Game Code
****/ 
// Music (not used, but placeholder for future)
// SFX
// Cloud (white, pixel-art, 128x64)
// Background (sky blue, pixel-art, 2048x2732)
// Ground (pixel-art, 2048x112)
// Pipe (green, pixel-art, 104x640, vertical, top and bottom use same asset, flipY for bottom)
// Bird (yellow, pixel-art style, 48x34)
// Game constants
var GAME_STATE = {
	MENU: 0,
	READY: 1,
	PLAY: 2,
	GAMEOVER: 3
};
var state = GAME_STATE.MENU;
var pipes = [];
var clouds = [];
var bird = null;
var ground = null;
var bg = null;
var score = 0;
var best = storage.best || 0;
var scoreTxt = null;
var bestTxt = null;
var groundY = 2732 - 112;
var pipeTimer = 0;
var cloudTimer = 0;
var menuGroup = null;
var gameOverGroup = null;
var tapToStartTxt = null;
var dragNode = null;
// --- Setup background ---
bg = LK.getAsset('bg', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(bg);
// --- Setup clouds ---
function spawnCloud() {
	var c = new Cloud();
	c.x = 2048 + 100 + Math.random() * 400;
	c.y = 200 + Math.random() * 800;
	clouds.push(c);
	game.addChild(c);
}
// --- Setup ground ---
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: groundY
});
game.addChild(ground);
// --- Setup bird ---
bird = new Bird();
bird.x = 700;
bird.y = 1366;
game.addChild(bird);
// --- Setup score text ---
scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFF700,
	font: "Impact"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Setup best score text (for game over) ---
bestTxt = new Text2('', {
	size: 90,
	fill: 0xFFFFFF,
	font: "Impact"
});
bestTxt.anchor.set(0.5, 0);
// --- Setup menu group ---
menuGroup = new Container();
var titleTxt = new Text2('FLAPPY BIRD', {
	size: 200,
	fill: 0xFFF700,
	font: "Impact"
});
titleTxt.anchor.set(0.5, 0.5);
titleTxt.x = 2048 / 2;
titleTxt.y = 700;
menuGroup.addChild(titleTxt);
var startBtn = new Text2('START', {
	size: 140,
	fill: 0xFFFFFF,
	font: "Impact"
});
startBtn.anchor.set(0.5, 0.5);
startBtn.x = 2048 / 2;
startBtn.y = 1200;
menuGroup.addChild(startBtn);
var copyrightTxt = new Text2('© Flappy Bird', {
	size: 60,
	fill: 0xFFFFFF,
	font: "Impact"
});
copyrightTxt.anchor.set(0.5, 0.5);
copyrightTxt.x = 2048 / 2;
copyrightTxt.y = 2732 - 60;
menuGroup.addChild(copyrightTxt);
game.addChild(menuGroup);
// --- Setup tap to start text ---
tapToStartTxt = new Text2('TAP TO START', {
	size: 120,
	fill: 0xFFFFFF,
	font: "Impact"
});
tapToStartTxt.anchor.set(0.5, 0.5);
tapToStartTxt.x = 2048 / 2;
tapToStartTxt.y = 1000;
// --- Setup game over group ---
gameOverGroup = new Container();
var gameOverTxt = new Text2('GAME OVER', {
	size: 180,
	fill: 0xFF0000,
	font: "Impact"
});
gameOverTxt.anchor.set(0.5, 0.5);
gameOverTxt.x = 2048 / 2;
gameOverTxt.y = 700;
gameOverGroup.addChild(gameOverTxt);
var scoreLabel = new Text2('SCORE', {
	size: 90,
	fill: 0xFFF700,
	font: "Impact"
});
scoreLabel.anchor.set(0.5, 0.5);
scoreLabel.x = 2048 / 2;
scoreLabel.y = 1000;
gameOverGroup.addChild(scoreLabel);
var finalScoreTxt = new Text2('0', {
	size: 140,
	fill: 0xFFF700,
	font: "Impact"
});
finalScoreTxt.anchor.set(0.5, 0.5);
finalScoreTxt.x = 2048 / 2;
finalScoreTxt.y = 1100;
gameOverGroup.addChild(finalScoreTxt);
var bestLabel = new Text2('BEST', {
	size: 90,
	fill: 0xFFFFFF,
	font: "Impact"
});
bestLabel.anchor.set(0.5, 0.5);
bestLabel.x = 2048 / 2;
bestLabel.y = 1250;
gameOverGroup.addChild(bestLabel);
bestTxt.x = 2048 / 2;
bestTxt.y = 1340;
gameOverGroup.addChild(bestTxt);
var retryBtn = new Text2('RETRY', {
	size: 120,
	fill: 0xFFFFFF,
	font: "Impact"
});
retryBtn.anchor.set(0.5, 0.5);
retryBtn.x = 2048 / 2;
retryBtn.y = 1600;
gameOverGroup.addChild(retryBtn);
var menuBtn = new Text2('MENU', {
	size: 100,
	fill: 0xFFFFFF,
	font: "Impact"
});
menuBtn.anchor.set(0.5, 0.5);
menuBtn.x = 2048 / 2;
menuBtn.y = 1750;
gameOverGroup.addChild(menuBtn);
// --- Helper functions ---
function resetGame() {
	// Remove pipes
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].destroy();
	}
	pipes = [];
	// Remove clouds
	for (var i = 0; i < clouds.length; i++) {
		clouds[i].destroy();
	}
	clouds = [];
	// Reset bird
	bird.x = 700;
	bird.y = 1366;
	bird.vy = 0;
	bird.rotation = 0;
	bird.alive = true;
	// Reset score
	score = 0;
	scoreTxt.setText('0');
	// Reset timers
	pipeTimer = 0;
	cloudTimer = 0;
}
function startGame() {
	resetGame();
	state = GAME_STATE.READY;
	menuGroup.visible = false;
	gameOverGroup.visible = false;
	tapToStartTxt.visible = true;
	LK.gui.top.addChild(tapToStartTxt);
}
function playGame() {
	state = GAME_STATE.PLAY;
	tapToStartTxt.visible = false;
}
function showGameOver() {
	state = GAME_STATE.GAMEOVER;
	finalScoreTxt.setText(score);
	if (score > best) {
		best = score;
		storage.best = best;
	}
	bestTxt.setText(best);
	gameOverGroup.visible = true;
	game.addChild(gameOverGroup);
	LK.getSound('die').play();
}
function showMenu() {
	state = GAME_STATE.MENU;
	menuGroup.visible = true;
	gameOverGroup.visible = false;
	tapToStartTxt.visible = false;
}
// --- Event handlers ---
game.down = function (x, y, obj) {
	if (state === GAME_STATE.MENU) {
		// Start button
		var local = startBtn.toLocal({
			x: x,
			y: y
		}, game);
		if (Math.abs(local.x) < startBtn.width / 2 && Math.abs(local.y) < startBtn.height / 2) {
			startGame();
			return;
		}
	}
	if (state === GAME_STATE.READY) {
		playGame();
		bird.flap();
		return;
	}
	if (state === GAME_STATE.PLAY) {
		bird.flap();
		return;
	}
	if (state === GAME_STATE.GAMEOVER) {
		// Retry button
		var localRetry = retryBtn.toLocal({
			x: x,
			y: y
		}, game);
		if (Math.abs(localRetry.x) < retryBtn.width / 2 && Math.abs(localRetry.y) < retryBtn.height / 2) {
			startGame();
			return;
		}
		// Menu button
		var localMenu = menuBtn.toLocal({
			x: x,
			y: y
		}, game);
		if (Math.abs(localMenu.x) < menuBtn.width / 2 && Math.abs(localMenu.y) < menuBtn.height / 2) {
			showMenu();
			return;
		}
	}
};
game.move = function (x, y, obj) {
	// No drag in Flappy Bird
};
game.up = function (x, y, obj) {
	// No drag in Flappy Bird
};
// --- Main update loop ---
game.update = function () {
	// Animate clouds
	for (var i = clouds.length - 1; i >= 0; i--) {
		var c = clouds[i];
		c.update();
		if (c.isOffScreen()) {
			c.destroy();
			clouds.splice(i, 1);
		}
	}
	if (state === GAME_STATE.MENU || state === GAME_STATE.READY) {
		// Spawn clouds slowly
		cloudTimer++;
		if (cloudTimer > 90) {
			spawnCloud();
			cloudTimer = 0;
		}
	}
	if (state === GAME_STATE.READY) {
		// Bird idle bobbing
		bird.y = 1366 + Math.sin(LK.ticks / 15) * 40;
		bird.rotation = Math.sin(LK.ticks / 30) * 0.1;
	}
	if (state === GAME_STATE.PLAY) {
		// Clouds
		cloudTimer++;
		if (cloudTimer > 60) {
			spawnCloud();
			cloudTimer = 0;
		}
		// Bird physics
		bird.update();
		// Pipes
		pipeTimer++;
		if (pipeTimer > 90) {
			var p = new PipePair();
			p.x = 2048 + 208;
			game.addChild(p);
			pipes.push(p);
			pipeTimer = 0;
		}
		for (var i = pipes.length - 1; i >= 0; i--) {
			var p = pipes[i];
			p.update();
			// Check for pass
			if (p.checkPass(bird)) {
				score++;
				scoreTxt.setText(score);
				LK.getSound('point').play();
			}
			// Remove offscreen
			if (p.isOffScreen()) {
				p.destroy();
				pipes.splice(i, 1);
			}
		}
		// Collision detection
		for (var i = 0; i < pipes.length; i++) {
			var p = pipes[i];
			// Bird bounding box
			var bx = bird.x;
			var by = bird.y;
			var bw = bird.width * 0.7;
			var bh = bird.height * 0.7;
			// Top pipe
			var px = p.x;
			var py = p.topPipe.y;
			var pw = p.pipeWidth;
			var ph = p.pipeHeight;
			// Top pipe rect
			if (bx + bw / 2 > px - pw / 2 && bx - bw / 2 < px + pw / 2 && by - bh / 2 < py && by + bh / 2 > py - ph) {
				// Hit top pipe
				bird.die();
				LK.getSound('hit').play();
				showGameOver();
				return;
			}
			// Bottom pipe rect
			var bpy = p.bottomPipe.y;
			if (bx + bw / 2 > px - pw / 2 && bx - bw / 2 < px + pw / 2 && by + bh / 2 > bpy && by - bh / 2 < bpy + ph) {
				// Hit bottom pipe
				bird.die();
				LK.getSound('hit').play();
				showGameOver();
				return;
			}
		}
		// Ground collision
		if (bird.y + bird.height / 2 > groundY) {
			bird.y = groundY - bird.height / 2;
			bird.die();
			LK.getSound('hit').play();
			showGameOver();
			return;
		}
		// Ceiling
		if (bird.y - bird.height / 2 < 0) {
			bird.y = bird.height / 2;
			bird.vy = 0;
		}
	}
	// Animate ground (scrolling effect)
	ground.x -= 10;
	if (ground.x <= -2048) ground.x += 2048;
	// Show/hide UI
	scoreTxt.visible = state === GAME_STATE.PLAY;
	menuGroup.visible = state === GAME_STATE.MENU;
	tapToStartTxt.visible = state === GAME_STATE.READY;
	gameOverGroup.visible = state === GAME_STATE.GAMEOVER;
};
// --- Initial state ---
showMenu();

===================================================================
--- original.js
+++ change.js