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

/**** 
* Classes
****/ 
// Answer Button Class
var AnswerButton = Container.expand(function () {
	var self = Container.call(this);
	// Attach default button asset
	var btn = self.attachAsset('answerBtn', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Answer text
	self.txt = self.addChild(new Text2('', {
		size: 120,
		fill: 0xFFFFFF
	}));
	self.txt.anchor.set(0.5, 0.5);
	// Value this button represents
	self.value = null;
	// State: 'default', 'correct', 'wrong'
	self.state = 'default';
	// Set answer value and text
	self.setValue = function (val) {
		self.value = val;
		self.txt.setText(val + '');
	};
	// Set state for visual feedback
	self.setState = function (state) {
		self.state = state;
		if (state === 'default') {
			btn.assetId = 'answerBtn';
			btn.setAsset('answerBtn');
		} else if (state === 'correct') {
			btn.assetId = 'answerBtnCorrect';
			btn.setAsset('answerBtnCorrect');
		} else if (state === 'wrong') {
			btn.assetId = 'answerBtnWrong';
			btn.setAsset('answerBtnWrong');
		}
	};
	// Reset to default state
	self.reset = function () {
		self.setState('default');
	};
	// Touch event handler
	self.down = function (x, y, obj) {
		if (typeof self.onSelect === 'function') {
			self.onSelect(self.value, self);
		}
	};
	return self;
});
// Question Box Class
var QuestionBox = Container.expand(function () {
	var self = Container.call(this);
	var box = self.attachAsset('questionBox', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.txt = self.addChild(new Text2('', {
		size: 150,
		fill: "#fff"
	}));
	self.txt.anchor.set(0.5, 0.5);
	self.setQuestion = function (q) {
		self.txt.setText(q);
	};
	return self;
});
// Timer Bar Class
var TimerBar = Container.expand(function () {
	var self = Container.call(this);
	// The bar background
	var bar = self.attachAsset('timerBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// The fill bar (will be scaled)
	self.fill = self.attachAsset('timerBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.fill.tint = 0x50E3C2;
	self.fill.y = 0;
	self.fill.x = 0;
	// Set progress (0 to 1)
	self.setProgress = function (p) {
		if (p < 0) p = 0;
		if (p > 1) p = 1;
		self.fill.scaleX = p;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	// No title, no description
	// Always backgroundColor is black
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Colors are chosen for visual clarity and engagement.
// Math Dash: Quick Solve uses simple shapes for answer buttons and question area.
// Game variables
var score = 0;
var question = null;
var correctAnswer = null;
var answerChoices = [];
var answerButtons = [];
var questionBox = null;
var timerBar = null;
var timer = null;
var timePerQuestion = 3500; // ms, will decrease as difficulty increases
var timeLeft = 0;
var questionStartTime = 0;
var scoreTxt = null;
var gameActive = true;
var difficultyLevel = 1; // Increases as player scores
// Layout positions
var centerX = 2048 / 2;
var questionY = 500;
var answersStartY = 1100;
var answerSpacing = 300;
// Create and add question box
questionBox = new QuestionBox();
questionBox.x = centerX;
questionBox.y = questionY;
game.addChild(questionBox);
// Create and add timer bar
timerBar = new TimerBar();
timerBar.x = centerX;
timerBar.y = questionY + 180;
game.addChild(timerBar);
// Create answer buttons (4 choices)
for (var i = 0; i < 4; i++) {
	var btn = new AnswerButton();
	btn.x = centerX;
	btn.y = answersStartY + i * answerSpacing;
	btn.idx = i;
	btn.onSelect = handleAnswer;
	answerButtons.push(btn);
	game.addChild(btn);
}
// Score text (top center, not in top left 100x100)
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Generate a new math question
function generateQuestion() {
	// Increase difficulty every 10 questions
	difficultyLevel = 1 + Math.floor(score / 10);
	// Choose operation and range based on difficulty
	var opRand = Math.random();
	var op = '+';
	var min = 1,
		max = 10 + difficultyLevel * 5;
	if (difficultyLevel >= 3 && opRand > 0.5) op = '-';
	if (difficultyLevel >= 5 && opRand > 0.7) op = '×';
	if (difficultyLevel >= 8 && opRand > 0.85) op = '÷';
	var a, b, q, ans;
	if (op === '+') {
		a = randInt(min, max);
		b = randInt(min, max);
		ans = a + b;
		q = a + " + " + b + " = ?";
	} else if (op === '-') {
		a = randInt(min, max);
		b = randInt(min, a); // ensure non-negative
		ans = a - b;
		q = a + " - " + b + " = ?";
	} else if (op === '×') {
		a = randInt(min, max - 5);
		b = randInt(2, 12);
		ans = a * b;
		q = a + " × " + b + " = ?";
	} else if (op === '÷') {
		b = randInt(2, 12);
		ans = randInt(min, max - 5);
		a = ans * b;
		q = a + " ÷ " + b + " = ?";
	}
	correctAnswer = ans;
	question = q;
	// Generate 3 wrong answers
	var wrongs = [];
	while (wrongs.length < 3) {
		var delta = randInt(1, 8 + difficultyLevel * 2);
		var wrong = ans + (Math.random() > 0.5 ? delta : -delta);
		if (wrong !== ans && wrong >= 0 && wrongs.indexOf(wrong) === -1) {
			wrongs.push(wrong);
		}
	}
	// Shuffle answers
	answerChoices = wrongs.concat([ans]);
	shuffleArray(answerChoices);
	// Set question and answers
	questionBox.setQuestion(question);
	for (var i = 0; i < 4; i++) {
		answerButtons[i].setValue(answerChoices[i]);
		answerButtons[i].reset();
	}
}
// Handle answer selection
function handleAnswer(val, btn) {
	if (!gameActive) return;
	if (val === correctAnswer) {
		btn.setState('correct');
		LK.getSound('correct').play();
		score += 1;
		LK.setScore(score);
		scoreTxt.setText(score + '');
		// Animate button
		tween(btn, {
			scaleX: 1.15,
			scaleY: 1.15
		}, {
			duration: 120,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(btn, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 120
				});
			}
		});
		// Next question after short delay
		LK.setTimeout(nextQuestion, 350);
	} else {
		btn.setState('wrong');
		LK.getSound('wrong').play();
		// Decrease score by 1, but not below zero
		score = Math.max(0, score - 1);
		LK.setScore(score);
		scoreTxt.setText(score + '');
		// Flash wrong, then game over
		tween(btn, {
			scaleX: 0.9,
			scaleY: 0.9
		}, {
			duration: 120,
			onFinish: function onFinish() {
				tween(btn, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 120
				});
			}
		});
		endGame();
	}
}
// Start next question
function nextQuestion() {
	if (!gameActive) return;
	// Increase speed as score increases
	timePerQuestion = Math.max(1200, 3500 - score * 80);
	timeLeft = timePerQuestion;
	questionStartTime = Date.now();
	generateQuestion();
}
// End game
function endGame() {
	if (!gameActive) return;
	gameActive = false;
	// Flash screen red
	LK.effects.flashScreen(0xD0021B, 800);
	// Show game over (handled by LK)
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 600);
}
// Utility: random integer [min, max]
function randInt(min, max) {
	return min + Math.floor(Math.random() * (max - min + 1));
}
// Utility: shuffle array in-place
function shuffleArray(arr) {
	for (var i = arr.length - 1; i > 0; i--) {
		var j = randInt(0, i);
		var t = arr[i];
		arr[i] = arr[j];
		arr[j] = t;
	}
}
// Game update loop
game.update = function () {
	if (!gameActive) return;
	// Update timer
	var now = Date.now();
	timeLeft = timePerQuestion - (now - questionStartTime);
	var progress = timeLeft / timePerQuestion;
	timerBar.setProgress(progress);
	// If time runs out
	if (timeLeft <= 0) {
		// Flash all buttons red
		for (var i = 0; i < 4; i++) {
			answerButtons[i].setState('wrong');
		}
		endGame();
	}
};
// Start first question
function startGame() {
	score = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	gameActive = true;
	difficultyLevel = 1;
	nextQuestion();
}
// On game reset, start again
startGame();

===================================================================
--- original.js
+++ change.js
@@ -100,9 +100,11 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x222244
+	// No title, no description
+	// Always backgroundColor is black
+	backgroundColor: 0x000000
 });
 
 /**** 
 * Game Code
@@ -157,10 +159,10 @@
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
 // Generate a new math question
 function generateQuestion() {
-	// Increase difficulty every 5 points
-	difficultyLevel = 1 + Math.floor(score / 5);
+	// Increase difficulty every 10 questions
+	difficultyLevel = 1 + Math.floor(score / 10);
 	// Choose operation and range based on difficulty
 	var opRand = Math.random();
 	var op = '+';
 	var min = 1,
@@ -240,8 +242,12 @@
 		LK.setTimeout(nextQuestion, 350);
 	} else {
 		btn.setState('wrong');
 		LK.getSound('wrong').play();
+		// Decrease score by 1, but not below zero
+		score = Math.max(0, score - 1);
+		LK.setScore(score);
+		scoreTxt.setText(score + '');
 		// Flash wrong, then game over
 		tween(btn, {
 			scaleX: 0.9,
 			scaleY: 0.9