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

/**** 
* Classes
****/ 
var FallingNumber = Container.expand(function (value) {
	var self = Container.call(this);
	self.value = value;
	self.speed = 3 + Math.random() * 2;
	self.collected = false;
	var numberGraphics = self.attachAsset('number' + value, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var numberText = new Text2(value.toString(), {
		size: 60,
		fill: '#ffffff'
	});
	numberText.anchor.set(0.5, 0.5);
	self.addChild(numberText);
	self.update = function () {
		if (!self.collected) {
			self.y += self.speed;
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	self.move = function (targetX) {
		self.x = Math.max(60, Math.min(2048 - 60, targetX));
	};
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 100;
var fallingNumbers = [];
var collectedNumbers = [];
var gameMode = 'subtraction'; // 'addition' or 'subtraction'
var targetSum = 0;
var currentSum = 20; // Start with 20 for subtraction mode
var lives = 3;
var gameSpeed = 1;
var spawnTimer = 0;
var spawnRate = 90;
// UI Elements
var targetSumText = new Text2('Target: 0', {
	size: 60,
	fill: '#ffffff'
});
targetSumText.anchor.set(0.5, 0);
LK.gui.top.addChild(targetSumText);
targetSumText.y = 80;
var currentSumText = new Text2('Current: 0', {
	size: 50,
	fill: '#ffeb3b'
});
currentSumText.anchor.set(0.5, 0);
LK.gui.top.addChild(currentSumText);
currentSumText.y = 160;
var livesText = new Text2('Lives: 3', {
	size: 50,
	fill: '#f44336'
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
livesText.x = -20;
livesText.y = 20;
var scoreText = new Text2('Score: 0', {
	size: 50,
	fill: '#ffffff'
});
scoreText.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreText);
scoreText.x = 120;
scoreText.y = 20;
var menuButton = new Text2('MENU', {
	size: 40,
	fill: '#ffffff'
});
menuButton.anchor.set(0, 0);
LK.gui.topLeft.addChild(menuButton);
menuButton.x = 20;
menuButton.y = 80;
var instructionText = new Text2('Arrastra para atrapar números\ny restarlos para llegar al objetivo', {
	size: 40,
	fill: '#ffffff'
});
instructionText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionText);
instructionText.y = -200;
// Make instruction text disappear after 15 seconds
tween(instructionText, {
	alpha: 0
}, {
	duration: 15000,
	onFinish: function onFinish() {
		instructionText.destroy();
	}
});
function generateTargetSum() {
	if (gameMode === 'subtraction') {
		targetSum = Math.floor(Math.random() * 15) + 1; // Target between 1-15
		targetSumText.setText('Target: ' + targetSum);
	} else {
		targetSum = Math.floor(Math.random() * 20) + 5;
		targetSumText.setText('Target: ' + targetSum);
	}
}
function updateCurrentSum() {
	if (gameMode === 'subtraction') {
		currentSum = 20; // Reset to starting value
		for (var i = 0; i < collectedNumbers.length; i++) {
			currentSum -= collectedNumbers[i]; // Subtract instead of add
		}
	} else {
		currentSum = 0;
		for (var i = 0; i < collectedNumbers.length; i++) {
			currentSum += collectedNumbers[i];
		}
	}
	currentSumText.setText('Current: ' + currentSum);
}
function checkSum() {
	if (currentSum === targetSum) {
		LK.setScore(LK.getScore() + targetSum * 10);
		LK.getSound('correct').play();
		collectedNumbers = [];
		generateTargetSum();
		gameSpeed += 0.1;
		spawnRate = Math.max(30, spawnRate - 2);
		// Flash effect
		tween(game, {}, {
			duration: 200,
			onFinish: function onFinish() {
				LK.effects.flashScreen(0x00ff00, 300);
			}
		});
	} else if (gameMode === 'subtraction' && currentSum < targetSum || gameMode === 'addition' && currentSum > targetSum) {
		lives--;
		LK.getSound('wrong').play();
		collectedNumbers = [];
		generateTargetSum();
		if (lives <= 0) {
			LK.showGameOver();
		}
		// Flash effect
		LK.effects.flashScreen(0xff0000, 500);
	}
}
function spawnNumber() {
	var value = Math.floor(Math.random() * 10);
	var number = new FallingNumber(value);
	number.x = Math.random() * (2048 - 240) + 120;
	number.y = -50;
	number.speed *= gameSpeed;
	fallingNumbers.push(number);
	game.addChild(number);
}
var dragNode = null;
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.move(x);
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = player;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
menuButton.down = function (x, y, obj) {
	// Toggle game mode between addition and subtraction
	if (gameMode === 'addition') {
		gameMode = 'subtraction';
		currentSum = 20;
		instructionText.setText('Arrastra para atrapar números\ny restarlos para llegar al objetivo');
	} else {
		gameMode = 'addition';
		currentSum = 0;
		instructionText.setText('Arrastra para atrapar números\ny sumarlos para llegar al objetivo');
	}
	collectedNumbers = [];
	generateTargetSum();
	updateCurrentSum();
};
game.update = function () {
	spawnTimer++;
	if (spawnTimer >= spawnRate) {
		spawnNumber();
		spawnTimer = 0;
	}
	// Update falling numbers
	for (var i = fallingNumbers.length - 1; i >= 0; i--) {
		var number = fallingNumbers[i];
		if (number.lastY === undefined) number.lastY = number.y;
		if (number.lastIntersecting === undefined) number.lastIntersecting = false;
		// Check if off screen
		if (number.lastY < 2732 + 50 && number.y >= 2732 + 50) {
			number.destroy();
			fallingNumbers.splice(i, 1);
			continue;
		}
		// Check collision with player
		var currentIntersecting = number.intersects(player);
		if (!number.lastIntersecting && currentIntersecting && !number.collected) {
			number.collected = true;
			collectedNumbers.push(number.value);
			LK.getSound('collect').play();
			// Animate collected number
			tween(number, {
				alpha: 0,
				scaleX: 0.5,
				scaleY: 0.5
			}, {
				duration: 300,
				onFinish: function onFinish() {
					number.destroy();
				}
			});
			fallingNumbers.splice(i, 1);
			updateCurrentSum();
			checkSum();
			continue;
		}
		number.lastY = number.y;
		number.lastIntersecting = currentIntersecting;
	}
	// Update UI
	scoreText.setText('Score: ' + LK.getScore());
	livesText.setText('Lives: ' + lives);
};
// Initialize first target
generateTargetSum();

===================================================================
--- original.js
+++ change.js
@@ -92,8 +92,16 @@
 scoreText.anchor.set(0, 0);
 LK.gui.topLeft.addChild(scoreText);
 scoreText.x = 120;
 scoreText.y = 20;
+var menuButton = new Text2('MENU', {
+	size: 40,
+	fill: '#ffffff'
+});
+menuButton.anchor.set(0, 0);
+LK.gui.topLeft.addChild(menuButton);
+menuButton.x = 20;
+menuButton.y = 80;
 var instructionText = new Text2('Arrastra para atrapar números\ny restarlos para llegar al objetivo', {
 	size: 40,
 	fill: '#ffffff'
 });
@@ -181,8 +189,23 @@
 };
 game.up = function (x, y, obj) {
 	dragNode = null;
 };
+menuButton.down = function (x, y, obj) {
+	// Toggle game mode between addition and subtraction
+	if (gameMode === 'addition') {
+		gameMode = 'subtraction';
+		currentSum = 20;
+		instructionText.setText('Arrastra para atrapar números\ny restarlos para llegar al objetivo');
+	} else {
+		gameMode = 'addition';
+		currentSum = 0;
+		instructionText.setText('Arrastra para atrapar números\ny sumarlos para llegar al objetivo');
+	}
+	collectedNumbers = [];
+	generateTargetSum();
+	updateCurrentSum();
+};
 game.update = function () {
 	spawnTimer++;
 	if (spawnTimer >= spawnRate) {
 		spawnNumber();