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

/**** 
* Classes
****/ 
var Card = Container.expand(function (pairId) {
	var self = Container.call(this);
	self.pairId = pairId;
	self.isFlipped = false;
	self.isMatched = false;
	self.back = self.attachAsset('card_back', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.face = self.attachAsset('card_face_' + pairId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.face.visible = false;
	// Public methods must be defined before they are called.
	self.flipUp = function (onComplete) {
		if (self.isFlipped) return;
		self.isFlipped = true;
		LK.getSound('flip').play();
		tween(self, {
			scaleX: 0
		}, {
			duration: 150,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				self.back.visible = false;
				self.face.visible = true;
				tween(self, {
					scaleX: 1
				}, {
					duration: 150,
					easing: tween.easeOut,
					onFinish: onComplete
				});
			}
		});
	};
	self.flipDown = function (onComplete) {
		if (!self.isFlipped) return;
		self.isFlipped = false;
		tween(self, {
			scaleX: 0
		}, {
			duration: 150,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				self.face.visible = false;
				self.back.visible = true;
				tween(self, {
					scaleX: 1
				}, {
					duration: 150,
					easing: tween.easeOut,
					onFinish: onComplete
				});
			}
		});
	};
	self.matchFound = function (onComplete) {
		self.isMatched = true;
		tween(self, {
			alpha: 0,
			scaleX: 1.2,
			scaleY: 1.2
		}, {
			duration: 400,
			easing: tween.easeIn,
			onFinish: onComplete
		});
	};
	self.down = function () {
		handleCardFlip(self);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2c3e50 // Dark slate blue background
});

/**** 
* Game Code
****/ 
// Purple
// Orange
// Cyan
// Magenta
// Yellow
// Green
// Blue
// Red
//Defining 8 pairs of cards + 1 card back.
//LK Engine will automatically create assets based on usage.
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
LK.setScore(0); // Initialize score
var COLS = 4;
var ROWS = 4;
var TOTAL_PAIRS = COLS * ROWS / 2;
var CARD_WIDTH = 350;
var CARD_HEIGHT = 450;
var MARGIN = 60;
var gridWidth = COLS * (CARD_WIDTH + MARGIN) - MARGIN;
var gridHeight = ROWS * (CARD_HEIGHT + MARGIN) - MARGIN;
var startX = (2048 - gridWidth) / 2 + CARD_WIDTH / 2;
var startY = (2732 - gridHeight) / 2 + CARD_HEIGHT / 2;
var cards = [];
var flippedCards = [];
var matchedPairs = 0;
var canPlay = true;
// --- Game Logic Functions ---
function handleCardFlip(card) {
	if (!canPlay || card.isFlipped || card.isMatched || flippedCards.length >= 2) {
		return;
	}
	flippedCards.push(card);
	card.flipUp(function () {
		if (flippedCards.length === 2) {
			canPlay = false;
			checkMatch();
		}
	});
}
function checkMatch() {
	var card1 = flippedCards[0];
	var card2 = flippedCards[1];
	if (card1.pairId === card2.pairId) {
		matchedPairs++;
		LK.setScore(LK.getScore() + 10);
		scoreTxt.setText('Score: ' + LK.getScore());
		LK.setTimeout(function () {
			LK.getSound('match').play();
			card1.matchFound();
			card2.matchFound(function () {
				resetTurn();
				if (matchedPairs === TOTAL_PAIRS) {
					LK.getSound('win').play();
					LK.showYouWin();
				}
			});
		}, 750);
	} else {
		LK.setTimeout(function () {
			card1.flipDown();
			card2.flipDown(function () {
				resetTurn();
			});
		}, 1000);
	}
}
function resetTurn() {
	flippedCards = [];
	canPlay = true;
}
function shuffle(array) {
	var currentIndex = array.length,
		randomIndex;
	while (currentIndex !== 0) {
		randomIndex = Math.floor(Math.random() * currentIndex);
		currentIndex--;
		var _ref = [array[randomIndex], array[currentIndex]];
		array[currentIndex] = _ref[0];
		array[randomIndex] = _ref[1];
	}
	return array;
}
// --- Board Setup ---
function setupBoard() {
	var pairIds = [];
	for (var i = 0; i < TOTAL_PAIRS; i++) {
		pairIds.push(i, i);
	}
	shuffle(pairIds);
	for (var row = 0; row < ROWS; row++) {
		for (var col = 0; col < COLS; col++) {
			var index = row * COLS + col;
			var pairId = pairIds[index];
			var card = new Card(pairId);
			card.x = startX + col * (CARD_WIDTH + MARGIN);
			card.y = startY + row * (CARD_HEIGHT + MARGIN);
			cards.push(card);
			game.addChild(card);
		}
	}
}
setupBoard();

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