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

/**** 
* Classes
****/ 
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.collected = false;
	self.update = function () {
		// Rotate coin for visual effect
		coinGraphics.rotation += 0.1;
	};
	return self;
});
var Flag = Container.expand(function () {
	var self = Container.call(this);
	var flagGraphics = self.attachAsset('flag', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	return self;
});
var Ground = Container.expand(function (width) {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: width || 400
	});
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	return self;
});
var Platform = Container.expand(function (width, color) {
	var self = Container.call(this);
	var platformGraphics = self.attachAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: width || 300,
		tint: color || 0x795548
	});
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityY = 0;
	self.isGrounded = false;
	self.canDoubleJump = false;
	self.moveSpeed = 3;
	self.jumpPower = -25;
	self.gravity = 0.8;
	self.maxFallSpeed = 15;
	self.jump = function () {
		if (self.isGrounded) {
			self.velocityY = self.jumpPower;
			self.isGrounded = false;
			self.canDoubleJump = true;
			LK.getSound('jump').play();
		} else if (self.canDoubleJump) {
			self.velocityY = self.jumpPower;
			self.canDoubleJump = false;
			LK.getSound('jump').play();
		}
	};
	self.update = function () {
		// Apply gravity
		if (!self.isGrounded) {
			self.velocityY += self.gravity;
			if (self.velocityY > self.maxFallSpeed) {
				self.velocityY = self.maxFallSpeed;
			}
		}
		// Move horizontally
		self.x += self.moveSpeed;
		// Apply vertical movement
		self.y += self.velocityY;
		// Check ground collision
		self.isGrounded = false;
		for (var i = 0; i < platforms.length; i++) {
			var platform = platforms[i];
			if (self.intersects(platform) && self.velocityY >= 0) {
				self.y = platform.y - platform.height / 2;
				self.velocityY = 0;
				self.isGrounded = true;
				self.canDoubleJump = false;
				break;
			}
		}
		// Check ground platforms
		for (var i = 0; i < groundPlatforms.length; i++) {
			var ground = groundPlatforms[i];
			if (self.intersects(ground) && self.velocityY >= 0) {
				self.y = ground.y - ground.height / 2;
				self.velocityY = 0;
				self.isGrounded = true;
				self.canDoubleJump = false;
				break;
			}
		}
		// Death condition - fell too far
		if (self.y > 2732 + 200) {
			LK.showGameOver();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game variables
var currentLevel = storage.currentLevel || 1;
var totalLevels = 5;
var levelComplete = false;
var cameraX = 0;
var levelWidth = 6000;
// Game objects arrays
var platforms = [];
var groundPlatforms = [];
var obstacles = [];
var coins = [];
var collectedCoins = 0;
// Create player
var player = game.addChild(new Player());
var flag;
// UI Elements
var levelTxt = new Text2('Level ' + currentLevel, {
	size: 80,
	fill: 0xFFFFFF
});
levelTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(levelTxt);
var scoreTxt = new Text2('Coins: 0', {
	size: 60,
	fill: 0xFFD700
});
scoreTxt.anchor.set(0, 0);
scoreTxt.x = 150;
scoreTxt.y = 100;
LK.gui.topLeft.addChild(scoreTxt);
// Level generation function
function generateLevel(level) {
	// Clear existing level objects
	for (var i = platforms.length - 1; i >= 0; i--) {
		platforms[i].destroy();
	}
	for (var i = groundPlatforms.length - 1; i >= 0; i--) {
		groundPlatforms[i].destroy();
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroy();
	}
	for (var i = coins.length - 1; i >= 0; i--) {
		coins[i].destroy();
	}
	if (flag) flag.destroy();
	platforms = [];
	groundPlatforms = [];
	obstacles = [];
	coins = [];
	collectedCoins = 0;
	levelComplete = false;
	// Reset player position
	player.x = 200;
	player.y = 2000;
	cameraX = 0;
	// Generate ground platforms
	for (var x = 0; x < levelWidth; x += 350) {
		var ground = game.addChild(new Ground(400));
		ground.x = x;
		ground.y = 2200;
		groundPlatforms.push(ground);
	}
	// Generate level-specific content
	if (level == 1) {
		// Level 1: Basic platforms and coins
		var platformPositions = [{
			x: 800,
			y: 1900
		}, {
			x: 1300,
			y: 1700
		}, {
			x: 1800,
			y: 1500
		}, {
			x: 2400,
			y: 1600
		}, {
			x: 2900,
			y: 1400
		}, {
			x: 3500,
			y: 1300
		}];
		for (var i = 0; i < platformPositions.length; i++) {
			var platform = game.addChild(new Platform(250));
			platform.x = platformPositions[i].x;
			platform.y = platformPositions[i].y;
			platforms.push(platform);
			// Add coin above each platform
			var coin = game.addChild(new Coin());
			coin.x = platform.x;
			coin.y = platform.y - 100;
			coins.push(coin);
		}
	} else if (level == 2) {
		// Level 2: More complex layout with obstacles
		var platformPositions = [{
			x: 700,
			y: 1800
		}, {
			x: 1100,
			y: 1600
		}, {
			x: 1600,
			y: 1400
		}, {
			x: 2200,
			y: 1500
		}, {
			x: 2700,
			y: 1300
		}, {
			x: 3200,
			y: 1600
		}, {
			x: 3800,
			y: 1200
		}, {
			x: 4300,
			y: 1400
		}];
		for (var i = 0; i < platformPositions.length; i++) {
			var platform = game.addChild(new Platform(200));
			platform.x = platformPositions[i].x;
			platform.y = platformPositions[i].y;
			platforms.push(platform);
		}
		// Add obstacles
		var obstaclePositions = [{
			x: 1400,
			y: 2200
		}, {
			x: 2500,
			y: 2200
		}, {
			x: 3600,
			y: 2200
		}];
		for (var i = 0; i < obstaclePositions.length; i++) {
			var obstacle = game.addChild(new Obstacle());
			obstacle.x = obstaclePositions[i].x;
			obstacle.y = obstaclePositions[i].y;
			obstacles.push(obstacle);
		}
		// Add coins
		var coinPositions = [{
			x: 900,
			y: 1700
		}, {
			x: 1400,
			y: 1300
		}, {
			x: 2000,
			y: 1350
		}, {
			x: 2900,
			y: 1200
		}, {
			x: 4100,
			y: 1300
		}];
		for (var i = 0; i < coinPositions.length; i++) {
			var coin = game.addChild(new Coin());
			coin.x = coinPositions[i].x;
			coin.y = coinPositions[i].y;
			coins.push(coin);
		}
	} else if (level == 3) {
		// Level 3: Challenging jumps and more obstacles
		var platformPositions = [{
			x: 600,
			y: 1900
		}, {
			x: 1000,
			y: 1500
		}, {
			x: 1500,
			y: 1200
		}, {
			x: 2100,
			y: 1400
		}, {
			x: 2600,
			y: 1100
		}, {
			x: 3200,
			y: 1300
		}, {
			x: 3800,
			y: 1000
		}, {
			x: 4400,
			y: 1200
		}, {
			x: 5000,
			y: 1400
		}];
		for (var i = 0; i < platformPositions.length; i++) {
			var platform = game.addChild(new Platform(180));
			platform.x = platformPositions[i].x;
			platform.y = platformPositions[i].y;
			platforms.push(platform);
		}
		// More obstacles
		var obstaclePositions = [{
			x: 1300,
			y: 2200
		}, {
			x: 2300,
			y: 2200
		}, {
			x: 3500,
			y: 2200
		}, {
			x: 4700,
			y: 2200
		}];
		for (var i = 0; i < obstaclePositions.length; i++) {
			var obstacle = game.addChild(new Obstacle());
			obstacle.x = obstaclePositions[i].x;
			obstacle.y = obstaclePositions[i].y;
			obstacles.push(obstacle);
		}
		// Coins in tricky spots
		var coinPositions = [{
			x: 800,
			y: 1800
		}, {
			x: 1250,
			y: 1100
		}, {
			x: 1800,
			y: 1050
		}, {
			x: 2850,
			y: 1000
		}, {
			x: 4200,
			y: 1100
		}, {
			x: 5200,
			y: 1300
		}];
		for (var i = 0; i < coinPositions.length; i++) {
			var coin = game.addChild(new Coin());
			coin.x = coinPositions[i].x;
			coin.y = coinPositions[i].y;
			coins.push(coin);
		}
	} else if (level == 4) {
		// Level 4: Advanced platforming
		var platformPositions = [{
			x: 500,
			y: 1800
		}, {
			x: 850,
			y: 1400
		}, {
			x: 1300,
			y: 1100
		}, {
			x: 1800,
			y: 1300
		}, {
			x: 2300,
			y: 1000
		}, {
			x: 2800,
			y: 1200
		}, {
			x: 3400,
			y: 900
		}, {
			x: 4000,
			y: 1100
		}, {
			x: 4600,
			y: 800
		}, {
			x: 5200,
			y: 1000
		}];
		for (var i = 0; i < platformPositions.length; i++) {
			var platform = game.addChild(new Platform(150));
			platform.x = platformPositions[i].x;
			platform.y = platformPositions[i].y;
			platforms.push(platform);
		}
		// Many obstacles
		var obstaclePositions = [{
			x: 1100,
			y: 2200
		}, {
			x: 2100,
			y: 2200
		}, {
			x: 3100,
			y: 2200
		}, {
			x: 4300,
			y: 2200
		}, {
			x: 5400,
			y: 2200
		}];
		for (var i = 0; i < obstaclePositions.length; i++) {
			var obstacle = game.addChild(new Obstacle());
			obstacle.x = obstaclePositions[i].x;
			obstacle.y = obstaclePositions[i].y;
			obstacles.push(obstacle);
		}
		// Premium coin placement
		var coinPositions = [{
			x: 700,
			y: 1300
		}, {
			x: 1100,
			y: 1000
		}, {
			x: 1600,
			y: 1200
		}, {
			x: 2600,
			y: 900
		}, {
			x: 3700,
			y: 800
		}, {
			x: 4800,
			y: 700
		}, {
			x: 5400,
			y: 900
		}];
		for (var i = 0; i < coinPositions.length; i++) {
			var coin = game.addChild(new Coin());
			coin.x = coinPositions[i].x;
			coin.y = coinPositions[i].y;
			coins.push(coin);
		}
	} else if (level == 5) {
		// Level 5: Master level
		var platformPositions = [{
			x: 400,
			y: 1700
		}, {
			x: 700,
			y: 1300
		}, {
			x: 1100,
			y: 1000
		}, {
			x: 1600,
			y: 1200
		}, {
			x: 2100,
			y: 900
		}, {
			x: 2600,
			y: 1100
		}, {
			x: 3200,
			y: 800
		}, {
			x: 3800,
			y: 1000
		}, {
			x: 4400,
			y: 700
		}, {
			x: 5000,
			y: 900
		}, {
			x: 5600,
			y: 1100
		}];
		for (var i = 0; i < platformPositions.length; i++) {
			var platform = game.addChild(new Platform(120));
			platform.x = platformPositions[i].x;
			platform.y = platformPositions[i].y;
			platforms.push(platform);
		}
		// Maximum obstacles
		var obstaclePositions = [{
			x: 900,
			y: 2200
		}, {
			x: 1800,
			y: 2200
		}, {
			x: 2900,
			y: 2200
		}, {
			x: 4100,
			y: 2200
		}, {
			x: 5300,
			y: 2200
		}];
		for (var i = 0; i < obstaclePositions.length; i++) {
			var obstacle = game.addChild(new Obstacle());
			obstacle.x = obstaclePositions[i].x;
			obstacle.y = obstaclePositions[i].y;
			obstacles.push(obstacle);
		}
		// Final challenge coins
		var coinPositions = [{
			x: 550,
			y: 1200
		}, {
			x: 900,
			y: 900
		}, {
			x: 1350,
			y: 1100
		}, {
			x: 2350,
			y: 800
		}, {
			x: 3500,
			y: 700
		}, {
			x: 4700,
			y: 600
		}, {
			x: 5800,
			y: 1000
		}];
		for (var i = 0; i < coinPositions.length; i++) {
			var coin = game.addChild(new Coin());
			coin.x = coinPositions[i].x;
			coin.y = coinPositions[i].y;
			coins.push(coin);
		}
	}
	// Add flag at the end of level
	flag = game.addChild(new Flag());
	flag.x = levelWidth - 300;
	flag.y = 2200;
}
// Initialize first level
generateLevel(currentLevel);
// Touch controls
game.down = function (x, y, obj) {
	if (!levelComplete) {
		player.jump();
	}
};
// Camera follow function
function updateCamera() {
	var targetX = player.x - 1024; // Center player horizontally
	if (targetX < 0) targetX = 0;
	if (targetX > levelWidth - 2048) targetX = levelWidth - 2048;
	cameraX = targetX;
	game.x = -cameraX;
}
// Game update loop
game.update = function () {
	if (levelComplete) return;
	// Update camera
	updateCamera();
	// Check obstacle collisions
	for (var i = 0; i < obstacles.length; i++) {
		if (player.intersects(obstacles[i])) {
			LK.showGameOver();
			return;
		}
	}
	// Check coin collection
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		if (!coin.collected && player.intersects(coin)) {
			coin.collected = true;
			coin.alpha = 0;
			collectedCoins++;
			LK.setScore(LK.getScore() + 10);
			scoreTxt.setText('Coins: ' + collectedCoins);
			LK.getSound('coin').play();
		}
	}
	// Check level completion
	if (player.intersects(flag) && !levelComplete) {
		levelComplete = true;
		LK.getSound('complete').play();
		if (currentLevel >= totalLevels) {
			// Game completed
			LK.showYouWin();
		} else {
			// Next level
			currentLevel++;
			storage.currentLevel = currentLevel;
			LK.setTimeout(function () {
				levelTxt.setText('Level ' + currentLevel);
				generateLevel(currentLevel);
			}, 1000);
		}
	}
	// Check if player moved backwards too much (optional fail condition)
	if (player.x < cameraX - 200) {
		LK.showGameOver();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -62,17 +62,23 @@
 		anchorY: 1.0
 	});
 	self.velocityY = 0;
 	self.isGrounded = false;
+	self.canDoubleJump = false;
 	self.moveSpeed = 3;
 	self.jumpPower = -25;
 	self.gravity = 0.8;
 	self.maxFallSpeed = 15;
 	self.jump = function () {
 		if (self.isGrounded) {
 			self.velocityY = self.jumpPower;
 			self.isGrounded = false;
+			self.canDoubleJump = true;
 			LK.getSound('jump').play();
+		} else if (self.canDoubleJump) {
+			self.velocityY = self.jumpPower;
+			self.canDoubleJump = false;
+			LK.getSound('jump').play();
 		}
 	};
 	self.update = function () {
 		// Apply gravity
@@ -93,8 +99,9 @@
 			if (self.intersects(platform) && self.velocityY >= 0) {
 				self.y = platform.y - platform.height / 2;
 				self.velocityY = 0;
 				self.isGrounded = true;
+				self.canDoubleJump = false;
 				break;
 			}
 		}
 		// Check ground platforms
@@ -103,8 +110,9 @@
 			if (self.intersects(ground) && self.velocityY >= 0) {
 				self.y = ground.y - ground.height / 2;
 				self.velocityY = 0;
 				self.isGrounded = true;
+				self.canDoubleJump = false;
 				break;
 			}
 		}
 		// Death condition - fell too far