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

/**** 
* Classes
****/ 
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carGraphics = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.driftAngle = 0;
	self.targetDriftAngle = 0;
	self.isDrifting = false;
	self.driftDuration = 0;
	self.driftIntensity = 0;
	self.rotation = 0;
	self.update = function () {
		self.y += self.speed;
		self.driftAngle += (self.targetDriftAngle - self.driftAngle) * 0.1;
		self.rotation = self.driftAngle;
		if (self.isDrifting) {
			self.driftDuration++;
			self.driftIntensity = Math.min(1, self.driftDuration / 30);
		}
	};
	return self;
});
var DriftParticle = Container.expand(function () {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset('driftParticle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityX = 0;
	self.velocityY = 0;
	self.life = 30;
	self.maxLife = 30;
	self.update = function () {
		self.life--;
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.alpha = self.life / self.maxLife;
		if (self.life <= 0) {
			self.shouldDestroy = true;
		}
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.lastY = self.y;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speed;
	};
	return self;
});
var TrackSegment = Container.expand(function () {
	var self = Container.call(this);
	var trackGraphics = self.attachAsset('track', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.speed = 8;
	self.curveOffset = 0;
	self.leftBound = 0;
	self.rightBound = 0;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a1a
});

/**** 
* Game Code
****/ 
var car = null;
var trackSegments = [];
var obstacles = [];
var driftParticles = [];
var score = 0;
var driftMultiplier = 1;
var driftCombo = 0;
var gameSpeed = 8;
var speedIncrement = 0;
var isGameActive = true;
var scoreTxt = new Text2('Score: 0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var comboTxt = new Text2('Combo: 0x', {
	size: 100,
	fill: 0xFFFF00
});
comboTxt.anchor.set(0.5, 0);
comboTxt.x = 0;
comboTxt.y = 150;
LK.gui.top.addChild(comboTxt);
var speedTxt = new Text2('Speed: 1x', {
	size: 100,
	fill: 0x00FF00
});
speedTxt.anchor.set(0.5, 0);
speedTxt.x = 0;
speedTxt.y = 250;
LK.gui.top.addChild(speedTxt);
function initializeCar() {
	car = game.addChild(new Car());
	car.x = 1024;
	car.y = 2300;
	car.speed = gameSpeed;
}
function createTrackSegment(yPos) {
	var segment = game.addChild(new TrackSegment());
	segment.x = 1024;
	segment.y = yPos;
	segment.speed = gameSpeed;
	var randomCurve = Math.random() - 0.5;
	segment.curveOffset = randomCurve * 200;
	segment.x += segment.curveOffset;
	segment.leftBound = segment.x - 300;
	segment.rightBound = segment.x + 300;
	trackSegments.push(segment);
}
function createObstacle(yPos, xOffset) {
	var obstacle = game.addChild(new Obstacle());
	obstacle.x = xOffset;
	obstacle.y = yPos;
	obstacle.speed = gameSpeed;
	obstacle.lastY = yPos;
	obstacles.push(obstacle);
}
function createDriftParticle(x, y) {
	var particle = game.addChild(new DriftParticle());
	particle.x = x;
	particle.y = y;
	particle.velocityX = (Math.random() - 0.5) * 6;
	particle.velocityY = Math.random() * 3 + 2;
	particle.shouldDestroy = false;
	driftParticles.push(particle);
}
function updateScore() {
	var driftBonus = Math.floor(car.driftIntensity * driftCombo * 10);
	score += driftBonus;
	LK.setScore(score);
	scoreTxt.setText('Score: ' + score);
}
function endDrift() {
	if (car.isDrifting && car.driftDuration > 10) {
		var bonusScore = Math.floor(car.driftDuration * driftMultiplier * 2);
		score += bonusScore;
		driftCombo++;
		driftMultiplier = 1 + driftCombo * 0.1;
		LK.getSound('combo').play();
		lastDriftTime = LK.ticks;
	}
	car.isDrifting = false;
	car.driftDuration = 0;
	car.driftIntensity = 0;
	car.targetDriftAngle = 0;
	comboTxt.setText('Combo: ' + driftCombo + 'x');
	updateScore();
}
function resetDriftCombo() {
	driftCombo = 0;
	driftMultiplier = 1;
	comboTxt.setText('Combo: 0x');
}
var dragNode = null;
var lastCarX = 1024;
game.down = function (x, y, obj) {
	dragNode = car;
	lastCarX = car.x;
};
game.up = function (x, y, obj) {
	if (dragNode && dragNode.isDrifting) {
		endDrift();
	}
	dragNode = null;
};
game.move = function (x, y, obj) {
	if (!isGameActive) return;
	if (dragNode) {
		var newX = x;
		newX = Math.max(200, Math.min(1848, newX));
		dragNode.x = newX;
		var movementDelta = Math.abs(newX - lastCarX);
		if (movementDelta > 5) {
			dragNode.isDrifting = true;
			dragNode.targetDriftAngle = (newX - lastCarX) * 0.02;
			if (!car.isDrifting) {
				LK.getSound('drift').play();
			}
			for (var p = 0; p < 2; p++) {
				createDriftParticle(dragNode.x + (Math.random() - 0.5) * 60, dragNode.y);
			}
		} else {
			if (dragNode.isDrifting) {
				endDrift();
			}
			dragNode.isDrifting = false;
			dragNode.driftDuration = 0;
		}
		lastCarX = newX;
	}
};
var trackCreateTimer = LK.setInterval(function () {
	if (isGameActive) {
		createTrackSegment(-200);
		if (LK.ticks % 120 === 0) {
			createObstacle(-300, 1024 + (Math.random() - 0.5) * 400);
		}
	}
}, 100);
var lastDriftTime = 0;
var comboResetTimer = LK.setInterval(function () {
	if (isGameActive && driftCombo > 0) {
		if (car.isDrifting) {
			lastDriftTime = LK.ticks;
		} else {
			var timeSinceLastDrift = LK.ticks - lastDriftTime;
			if (timeSinceLastDrift > 120) {
				resetDriftCombo();
			}
		}
	}
}, 500);
game.update = function () {
	if (!isGameActive) return;
	speedIncrement++;
	if (speedIncrement > 3000) {
		gameSpeed = Math.min(14, gameSpeed + 0.5);
		speedIncrement = 0;
	}
	car.speed = gameSpeed;
	for (var i = trackSegments.length - 1; i >= 0; i--) {
		var segment = trackSegments[i];
		segment.speed = gameSpeed;
		if (segment.y > 2800) {
			segment.destroy();
			trackSegments.splice(i, 1);
		}
	}
	for (var o = obstacles.length - 1; o >= 0; o--) {
		var obstacle = obstacles[o];
		obstacle.speed = gameSpeed;
		if (obstacle.lastY >= -100 && obstacle.y < -100) {
			obstacle.destroy();
			obstacles.splice(o, 1);
			continue;
		}
		var carLeft = car.x - 40;
		var carRight = car.x + 40;
		var carTop = car.y - 60;
		var carBottom = car.y + 60;
		var obstacleLeft = obstacle.x - 30;
		var obstacleRight = obstacle.x + 30;
		var obstacleTop = obstacle.y - 30;
		var obstacleBottom = obstacle.y + 30;
		if (carRight > obstacleLeft && carLeft < obstacleRight && carBottom > obstacleTop && carTop < obstacleBottom) {
			isGameActive = false;
			LK.getSound('crash').play();
			LK.effects.flashScreen(0xff0000, 500);
			LK.showGameOver();
		}
		obstacle.lastY = obstacle.y;
	}
	for (var d = driftParticles.length - 1; d >= 0; d--) {
		var particle = driftParticles[d];
		if (particle.shouldDestroy) {
			particle.destroy();
			driftParticles.splice(d, 1);
		}
	}
	var trackBoundaryLeft = 150;
	var trackBoundaryRight = 1898;
	if (car.x < trackBoundaryLeft || car.x > trackBoundaryRight) {
		isGameActive = false;
		LK.getSound('crash').play();
		LK.effects.flashScreen(0xff0000, 500);
		LK.showGameOver();
	}
	updateScore();
	speedTxt.setText('Speed: ' + (1 + (gameSpeed - 8) / 6).toFixed(1) + 'x');
};
initializeCar();
for (var t = 0; t < 8; t++) {
	createTrackSegment(-200 + t * 400);
}
LK.playMusic('bgmusic', {
	loop: true,
	volume: 0.5
});

===================================================================
--- original.js
+++ change.js
@@ -155,8 +155,9 @@
 	particle.x = x;
 	particle.y = y;
 	particle.velocityX = (Math.random() - 0.5) * 6;
 	particle.velocityY = Math.random() * 3 + 2;
+	particle.shouldDestroy = false;
 	driftParticles.push(particle);
 }
 function updateScore() {
 	var driftBonus = Math.floor(car.driftIntensity * driftCombo * 10);
@@ -170,8 +171,9 @@
 		score += bonusScore;
 		driftCombo++;
 		driftMultiplier = 1 + driftCombo * 0.1;
 		LK.getSound('combo').play();
+		lastDriftTime = LK.ticks;
 	}
 	car.isDrifting = false;
 	car.driftDuration = 0;
 	car.driftIntensity = 0;
@@ -190,8 +192,11 @@
 	dragNode = car;
 	lastCarX = car.x;
 };
 game.up = function (x, y, obj) {
+	if (dragNode && dragNode.isDrifting) {
+		endDrift();
+	}
 	dragNode = null;
 };
 game.move = function (x, y, obj) {
 	if (!isGameActive) return;
@@ -209,8 +214,11 @@
 			for (var p = 0; p < 2; p++) {
 				createDriftParticle(dragNode.x + (Math.random() - 0.5) * 60, dragNode.y);
 			}
 		} else {
+			if (dragNode.isDrifting) {
+				endDrift();
+			}
 			dragNode.isDrifting = false;
 			dragNode.driftDuration = 0;
 		}
 		lastCarX = newX;
@@ -223,13 +231,18 @@
 			createObstacle(-300, 1024 + (Math.random() - 0.5) * 400);
 		}
 	}
 }, 100);
+var lastDriftTime = 0;
 var comboResetTimer = LK.setInterval(function () {
-	if (isGameActive && car.isDrifting === false && driftCombo > 0) {
-		var timeSinceLastDrift = 0;
-		if (timeSinceLastDrift > 60) {
-			resetDriftCombo();
+	if (isGameActive && driftCombo > 0) {
+		if (car.isDrifting) {
+			lastDriftTime = LK.ticks;
+		} else {
+			var timeSinceLastDrift = LK.ticks - lastDriftTime;
+			if (timeSinceLastDrift > 120) {
+				resetDriftCombo();
+			}
 		}
 	}
 }, 500);
 game.update = function () {