/**** 
* Classes
****/ 
var LetterPiece = Container.expand(function () {
	var self = Container.call(this);
	self.assetId = 'letter' + String.fromCharCode(65 + Math.floor(Math.random() * 6));
	var pieceGraphics = self.attachAsset(self.assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.correctPosition = {
		x: 0,
		y: 0
	};
	self.isCorrect = false;
	self.setCorrectPosition = function (x, y) {
		self.correctPosition.x = x;
		self.correctPosition.y = y;
	};
	self.checkPosition = function () {
		if (Math.abs(self.x - self.correctPosition.x) < 10 && Math.abs(self.y - self.correctPosition.y) < 10) {
			self.isCorrect = true;
			self.x = self.correctPosition.x;
			self.y = self.correctPosition.y;
		} else {
			self.isCorrect = false;
		}
	};
	self.down = function (x, y, obj) {
		dragNode = self;
	};
	self.up = function (x, y, obj) {
		dragNode = null;
		self.checkPosition();
	};
	return self;
});
//<Assets used in the game will automatically appear here>
// PuzzlePiece class to represent each piece of the puzzle
var PuzzlePiece = Container.expand(function () {
	var self = Container.call(this);
	self.assetId = 'piece' + (Math.floor(Math.random() * 10) + 1);
	var pieceGraphics = self.attachAsset(self.assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.correctPosition = {
		x: 0,
		y: 0
	};
	self.isCorrect = false;
	self.setCorrectPosition = function (x, y) {
		self.correctPosition.x = x;
		self.correctPosition.y = y;
	};
	self.checkPosition = function () {
		if (Math.abs(self.x - self.correctPosition.x) < 10 && Math.abs(self.y - self.correctPosition.y) < 10) {
			self.isCorrect = true;
			self.x = self.correctPosition.x;
			self.y = self.correctPosition.y;
		} else {
			self.isCorrect = false;
		}
		self.joinSameColor();
	};
	self.joinSameColor = function () {
		pieces.forEach(function (piece) {
			if (piece !== self && piece.assetId === self.assetId && Math.abs(self.x - piece.x) < 10 && Math.abs(self.y - piece.y) < 10) {
				self.x = piece.x;
				self.y = piece.y;
				self.isCorrect = true;
				piece.isCorrect = true;
			}
		});
	};
	self.down = function (x, y, obj) {
		dragNode = self;
	};
	self.up = function (x, y, obj) {
		dragNode = null;
		self.checkPosition();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background
});

/**** 
* Game Code
****/ 
var background = LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2
});
game.addChild(background);
var scoreTxt = new Text2('Level: 1', {
	size: 100,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var pieces = [];
var dragNode = null;
var level = 1;
var maxLevels = 80;
var scoreTxt = new Text2('Level: 1', {
	size: 100,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
function createPuzzle(level) {
	// Clear previous pieces
	pieces.forEach(function (piece) {
		return piece.destroy();
	});
	pieces = [];
	// Create new pieces for the current level
	for (var i = 0; i < 10; i++) {
		var piece = new LetterPiece();
		piece.x = Math.random() * 2048;
		piece.y = Math.random() * 2732;
		piece.setCorrectPosition(100 + i * 150, 100 + i * 150);
		pieces.push(piece);
		game.addChild(piece);
	}
}
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.x = x;
		dragNode.y = y;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
game.update = function () {
	if (pieces.every(function (piece) {
		return piece.isCorrect;
	})) {
		if (level < maxLevels) {
			level++;
			scoreTxt.setText('Level: ' + level);
			createPuzzle(level);
		} else {
			LK.showGameOver();
		}
	}
};
// Initialize the first level
createPuzzle(level);

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,41 @@
 /**** 
 * Classes
 ****/ 
+var LetterPiece = Container.expand(function () {
+	var self = Container.call(this);
+	self.assetId = 'letter' + String.fromCharCode(65 + Math.floor(Math.random() * 6));
+	var pieceGraphics = self.attachAsset(self.assetId, {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.correctPosition = {
+		x: 0,
+		y: 0
+	};
+	self.isCorrect = false;
+	self.setCorrectPosition = function (x, y) {
+		self.correctPosition.x = x;
+		self.correctPosition.y = y;
+	};
+	self.checkPosition = function () {
+		if (Math.abs(self.x - self.correctPosition.x) < 10 && Math.abs(self.y - self.correctPosition.y) < 10) {
+			self.isCorrect = true;
+			self.x = self.correctPosition.x;
+			self.y = self.correctPosition.y;
+		} else {
+			self.isCorrect = false;
+		}
+	};
+	self.down = function (x, y, obj) {
+		dragNode = self;
+	};
+	self.up = function (x, y, obj) {
+		dragNode = null;
+		self.checkPosition();
+	};
+	return self;
+});
 //<Assets used in the game will automatically appear here>
 // PuzzlePiece class to represent each piece of the puzzle
 var PuzzlePiece = Container.expand(function () {
 	var self = Container.call(this);
@@ -89,9 +123,9 @@
 	});
 	pieces = [];
 	// Create new pieces for the current level
 	for (var i = 0; i < 10; i++) {
-		var piece = new PuzzlePiece();
+		var piece = new LetterPiece();
 		piece.x = Math.random() * 2048;
 		piece.y = Math.random() * 2732;
 		piece.setCorrectPosition(100 + i * 150, 100 + i * 150);
 		pieces.push(piece);