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

/**** 
* Classes
****/ 
// Bonus Item Class
var Bonus = Container.expand(function () {
	var self = Container.call(this);
	// 50 simple bonus types, all using the same asset but different type strings
	var types = [];
	for (var i = 1; i <= 40; i++) {
		types.push({
			id: 'bonus',
			type: 'score' + i
		});
	}
	// Add new fun bonus types!
	types.push({
		id: 'bonus',
		type: 'shield'
	});
	types.push({
		id: 'bonus',
		type: 'double'
	});
	types.push({
		id: 'bonus',
		type: 'slowmo'
	}); // Slow motion for a short time
	types.push({
		id: 'bonus',
		type: 'shrink'
	}); // Shrink player for a short time
	types.push({
		id: 'bonus',
		type: 'invincible'
	}); // Invincible for a short time
	types.push({
		id: 'bonus',
		type: 'teleport'
	}); // Teleport player to random lane
	types.push({
		id: 'bonus',
		type: 'clear'
	}); // Clear all obstacles/enemies
	types.push({
		id: 'bonus',
		type: 'magnet'
	}); // Attract bonuses for a short time
	types.push({
		id: 'bonus',
		type: 'reverse'
	}); // Reverse enemy direction for a short time
	types.push({
		id: 'bonus',
		type: 'score'
	}); // fallback classic
	var chosen = types[Math.floor(Math.random() * types.length)];
	self.type = chosen.type;
	// Use different tints for power-ups
	var tint = 0xffffff;
	if (self.type === 'shield') tint = 0x42a5f5;else if (self.type === 'double') tint = 0xffd600;else {
		// Give each score bonus a different color for fun
		// Cycle through a palette
		var palette = [0xffffff, 0xffe082, 0x80cbc4, 0xffab91, 0xb39ddb, 0xa5d6a7, 0xffccbc, 0x90caf9, 0xf48fb1, 0xc5e1a5, 0xffecb3, 0xb0bec5, 0xd7ccc8, 0xffb74d, 0x81d4fa, 0xe1bee7, 0xc8e6c9, 0xff8a65, 0x9575cd, 0x4db6ac, 0x7986cb, 0x64b5f6, 0xffd54f, 0x4fc3f7, 0x81c784, 0xba68c8, 0x4dd0e1, 0xf06292, 0xa1887f, 0x90a4ae, 0x388e3c, 0xdce775, 0x00bcd4, 0x8d6e63, 0x43a047, 0x00acc1, 0x689f38, 0x039be5, 0x7e57c2, 0x0288d1, 0x0097a7, 0x388e3c, 0x1976d2, 0x0288d1, 0x009688, 0x43a047, 0x689f38];
		// Extract number from type string, e.g. "score17" -> 17
		var idx = 0;
		if (self.type.indexOf('score') === 0 && self.type.length > 5) {
			idx = parseInt(self.type.substring(5), 10) - 1;
			if (isNaN(idx) || idx < 0) idx = 0;
		}
		tint = palette[idx % palette.length];
	}
	var b = self.attachAsset(chosen.id, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	b.tint = tint;
	self.width = b.width;
	self.height = b.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		self.y += self.speed;
	};
	self.getBounds = function () {
		// Shrink hitbox for better gameplay feel
		var w = b.width * 0.7;
		var h = b.height * 0.7;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});
// Enemy Car Class
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	// Randomly select one of the enemy car asset ids
	var enemyCarIds = ['enemyCar', 'enemyCar2', 'enemyCar3', 'enemyCar4'];
	var chosenId = enemyCarIds[Math.floor(Math.random() * enemyCarIds.length)];
	var car = self.attachAsset(chosenId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = car.width;
	self.height = car.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		// Store lastX and lastY for event triggers and lane change logic
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		self.y += self.speed;
		// Randomly decide to change lane (only if not already changing, and not too often)
		if (!self._laneChangeCooldown) self._laneChangeCooldown = 0;
		if (!self._isChangingLane) self._isChangingLane = false;
		// Only allow lane change if not currently changing, and not near the bottom of the screen
		if (!self._isChangingLane && self._laneChangeCooldown <= 0 && self.y > 0 && self.y < 2200) {
			// 0.7% chance per frame to attempt lane change (lowered from 2%)
			if (Math.random() < 0.007) {
				// Pick a direction: -1 (left) or +1 (right)
				var dir = Math.random() < 0.5 ? -1 : 1;
				var newLane = self.lane + dir;
				// Only change if new lane is valid and not occupied by another enemy car or obstacle
				if (newLane >= 0 && newLane < laneCenters.length) {
					var canChange = true;
					// Check for other enemy cars in the target lane, close in Y
					for (var i = 0; i < enemyCars.length; i++) {
						var other = enemyCars[i];
						if (other !== self && other.lane === newLane && Math.abs(other.y - self.y) < self.height * 1.2) {
							canChange = false;
							break;
						}
					}
					// Check for obstacles in the target lane, close in Y
					if (canChange) {
						for (var i = 0; i < obstacles.length; i++) {
							var obs = obstacles[i];
							if (obs.lane === newLane && Math.abs(obs.y - self.y) < self.height * 1.2) {
								canChange = false;
								break;
							}
						}
					}
					if (canChange) {
						// Begin lane change
						self._isChangingLane = true;
						self._targetLane = newLane;
						self._laneChangeStartX = self.x;
						self._laneChangeStartY = self.y;
						self._laneChangeProgress = 0;
						self._laneChangeDuration = 18 + Math.floor(Math.random() * 10); // frames
					}
				}
			}
		}
		// If currently changing lane, animate X toward new lane center using tween
		if (self._isChangingLane) {
			if (!self._laneTweenStarted) {
				self._laneTweenStarted = true;
				tween(self, {
					x: laneCenters[self._targetLane]
				}, {
					duration: self._laneChangeDuration * 16,
					easing: tween.easeInOutSine,
					onFinish: function onFinish() {
						self.x = laneCenters[self._targetLane];
						self.lane = self._targetLane;
						self._isChangingLane = false;
						self._laneChangeCooldown = 60 + Math.floor(Math.random() * 60);
						self._laneTweenStarted = false;
					}
				});
			}
		} else {
			self._laneTweenStarted = false;
			// Not changing lane, decrement cooldown if needed
			if (self._laneChangeCooldown > 0) self._laneChangeCooldown--;
		}
		// Update lastX and lastY for next frame
		self.lastX = self.x;
		self.lastY = self.y;
	};
	self.getBounds = function () {
		// Shrink hitbox for better gameplay feel
		var w = car.width * 0.7;
		var h = car.height * 0.7;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});
// Obstacle Class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = obs.width;
	self.height = obs.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		self.y += self.speed;
	};
	self.getBounds = function () {
		// Shrink hitbox for better gameplay feel
		var w = obs.width * 0.7;
		var h = obs.height * 0.7;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});
// Player Car Class
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.55,
		scaleY: 0.55
	});
	self._carAsset = car; // Store reference for shrink/restore
	self.width = car.width * 0.55;
	self.height = car.height * 0.55;
	// For touch drag offset
	self.dragOffsetX = 0;
	self.dragOffsetY = 0;
	// For collision
	self.getBounds = function () {
		// Shrink hitbox for better gameplay feel
		var w = car.width * 0.55;
		var h = car.height * 0.55;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// Intense mode music (for hard stage, optional)
// Main background music (looped)
// --- MUSIC ---
// Win
// Game over
// Button tap (UI)
// Lane change (player moves to another lane)
// Reverse pickup
// Magnet pickup
// Clear pickup
// Teleport pickup
// Invincible pickup
// Shrink pickup
// Slowmo pickup
// Double score pickup
// Shield pickup
// Bonus pickup
// Car crash
// Car engine accelerate (short burst)
// Car engine idle (looped quietly in background)
// --- SOUND EFFECTS ---
// Tree and plant assets for background
// Road and lane setup
// Car (player)
// Enemy car
// Obstacle (barrier)
// Road lane
// Bonus item
var roadWidth = 900;
var roadLeft = (2048 - roadWidth) / 2;
var roadRight = roadLeft + roadWidth;
var laneCount = 4;
var laneWidth = roadWidth / laneCount;
var laneCenters = [];
for (var i = 0; i < laneCount; i++) {
	laneCenters.push(roadLeft + laneWidth / 2 + i * laneWidth);
}
// --- Add colorful trees and plants to left and right sides of the road as background ---
var bgDecor = [];
var decorTypes = [{
	id: 'tree1',
	yOffset: 0
}, {
	id: 'tree2',
	yOffset: 40
}, {
	id: 'plant1',
	yOffset: 120
}, {
	id: 'plant2',
	yOffset: 180
}, {
	id: 'plant3',
	yOffset: 240
}, {
	id: 'plant3',
	yOffset: 240
}, {
	id: 'plant3',
	yOffset: 240
}, {
	id: 'plant3',
	yOffset: 240
}, {
	// extra plant3 for higher probability
	id: 'plant3',
	yOffset: 240
}, {
	id: 'plant3',
	yOffset: 240
}, {
	id: 'plant3',
	yOffset: 240
}];
// Place decorations in a staggered, repeating pattern, but less frequently
for (var side = 0; side < 2; side++) {
	// 0: left, 1: right
	for (var i = 0; i < 4; i++) {
		// Reduced from 8 to 4 for lower frequency
		var typeIdx = i % decorTypes.length;
		var decor = LK.getAsset(decorTypes[typeIdx].id, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		// X position: left or right of road, with some random offset for natural look
		if (side === 0) {
			decor.x = roadLeft - 90 + Math.random() * 30;
		} else {
			decor.x = roadRight + 90 - Math.random() * 30;
		}
		// Y position: staggered vertically, with some random offset, spacing increased for less density
		decor.y = 300 + i * 640 + decorTypes[typeIdx].yOffset + Math.random() * 40;
		// Store for scrolling
		decor._baseY = decor.y;
		decor._side = side;
		decor._typeIdx = typeIdx;
		game.addChild(decor);
		bgDecor.push(decor);
	}
}
// Draw lane markers (scrolling effect)
var laneMarkers = [];
for (var i = 1; i < laneCount; i++) {
	for (var j = 0; j < 6; j++) {
		var marker = LK.getAsset('lane', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: roadLeft + i * laneWidth,
			y: j * 400
		});
		marker.laneIdx = i;
		marker.offsetIdx = j;
		game.addChild(marker);
		laneMarkers.push(marker);
	}
}
// Player car
var player = new PlayerCar();
player.x = laneCenters[1];
player.y = 2732 - 500;
game.addChild(player);
// --- Bonus effect indicator above player ---
var bonusIcon = new Text2('', {
	size: 90,
	fill: "#fff",
	font: "Arial"
});
bonusIcon.anchor.set(0.5, 1);
bonusIcon.x = player.x;
bonusIcon.y = player.y - player.height / 2 - 30;
bonusIcon.alpha = 0;
game.addChild(bonusIcon);
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Bonus score
var bonusScore = 0;
var bonusTxt = new Text2('', {
	size: 70,
	fill: 0xFFFA00 // Bright yellow for high visibility
});
bonusTxt.anchor.set(0.5, 0);
// Move the bonus text further down (e.g. 180px from the top)
bonusTxt.y = 180;
LK.gui.top.addChild(bonusTxt);
// Game state
var enemyCars = [];
var obstacles = [];
var bonuses = [];
var gameSpeed = 18;
var ticksSinceStart = 0;
var lastSpawnTick = 0;
var lastBonusTick = 0;
var isDragging = false;
var dragStartX = 0;
var dragStartY = 0;
var playerStartX = 0;
var playerStartY = 0;
var lastCrash = false;
// Mouse/touch drag to move player car directly with finger/mouse
var isDragging = false;
var dragStartX = 0;
var dragStartY = 0;
var playerStartX = 0;
var playerStartY = 0;
game.down = function (x, y, obj) {
	// Only start drag if touch/click is on the player car
	// Use a generous hitbox for mobile
	var bounds = player.getBounds();
	if (x >= bounds.x - 60 && x <= bounds.x + bounds.width + 60 && y >= bounds.y - 60 && y <= bounds.y + bounds.height + 60) {
		isDragging = true;
		dragStartX = x;
		dragStartY = y;
		playerStartX = player.x;
		playerStartY = player.y;
		// Cancel any lane tween if present
		if (typeof playerMoveTween !== "undefined" && playerMoveTween && playerMoveTween.cancel) playerMoveTween.cancel();
	}
};
game.move = function (x, y, obj) {
	if (isDragging) {
		// Move player car with finger/mouse, but clamp to road
		var dx = x - dragStartX;
		var dy = y - dragStartY;
		var newX = playerStartX + dx;
		var newY = playerStartY + dy;
		// Clamp X to road
		var minX = roadLeft + player.width / 2;
		var maxX = roadRight - player.width / 2;
		if (newX < minX) newX = minX;
		if (newX > maxX) newX = maxX;
		// Clamp Y to visible area (bottom 2/3 of screen)
		var minY = 600 + player.height / 2;
		var maxY = 2732 - player.height / 2;
		if (newY < minY) newY = minY;
		if (newY > maxY) newY = maxY;
		// Prevent overlap with enemy cars and obstacles
		var tempPlayer = {
			getBounds: function getBounds() {
				// Use the same getBounds as player, but at newX, newY
				var w = player.width;
				var h = player.height;
				return {
					x: newX - w / 2,
					y: newY - h / 2,
					width: w,
					height: h
				};
			}
		};
		var overlap = false;
		// Check with enemy cars
		for (var i = 0; i < enemyCars.length; i++) {
			if (intersects(tempPlayer, enemyCars[i])) {
				overlap = true;
				break;
			}
		}
		// Check with obstacles
		if (!overlap) {
			for (var i = 0; i < obstacles.length; i++) {
				if (intersects(tempPlayer, obstacles[i])) {
					overlap = true;
					break;
				}
			}
		}
		// Only move if not overlapping
		if (!overlap) {
			// Play lane change sound if player changed lane (by X)
			if (Math.abs(player.x - newX) > laneWidth * 0.8) {
				LK.getSound('lane_change').play();
			}
			// Animate player car movement for smooth drag
			tween.stop(player, {
				x: true,
				y: true
			});
			tween(player, {
				x: newX,
				y: newY
			}, {
				duration: 80,
				easing: tween.easeOutCubic
			});
		}
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
// Helper: collision check (AABB)
function intersects(a, b) {
	var ab = a.getBounds();
	var bb = b.getBounds();
	return ab.x < bb.x + bb.width && ab.x + ab.width > bb.x && ab.y < bb.y + bb.height && ab.y + ab.height > bb.y;
}
// Main game loop
game.update = function () {
	ticksSinceStart++;
	// 3-stage difficulty progression: very easy, then medium, then hard
	// Very Easy: 0-3000 ticks (~50s), Medium: 3000-6000 ticks (~100s), Hard: 6000+ ticks
	if (!game._spawnInterval) game._spawnInterval = 40;
	if (ticksSinceStart < 3000) {
		// Very Easy: very slow ramp up
		if (ticksSinceStart % 600 == 0 && gameSpeed < 20) {
			gameSpeed += 1;
		}
		if (ticksSinceStart % 600 == 0 && game._spawnInterval > 32) {
			game._spawnInterval -= 1;
		}
	} else if (ticksSinceStart < 6000) {
		// Medium: moderate ramp up
		if (ticksSinceStart % 300 == 0 && gameSpeed < 28) {
			gameSpeed += 1;
		}
		if (ticksSinceStart % 300 == 0 && game._spawnInterval > 20) {
			game._spawnInterval -= 1;
		}
	} else {
		// Hard: faster ramp up, but cap
		if (ticksSinceStart % 120 == 0 && gameSpeed < 38) {
			gameSpeed += 1;
		}
		if (ticksSinceStart % 120 == 0 && game._spawnInterval > 14) {
			game._spawnInterval -= 1;
		}
	}
	// Move background trees and plants for scrolling effect
	for (var i = 0; i < bgDecor.length; i++) {
		var decor = bgDecor[i];
		decor.y += gameSpeed;
		// If decor goes off bottom, loop to top with new random offset for variety
		if (decor.y > 2732 + 120) {
			decor.y -= 8 * 320;
			decor.y += Math.random() * 40 - 20;
			// Optionally randomize X a bit for more natural look
			if (decor._side === 0) {
				decor.x = roadLeft - 90 + Math.random() * 30;
			} else {
				decor.x = roadRight + 90 - Math.random() * 30;
			}
		}
	}
	// Move lane markers for scrolling effect
	for (var i = 0; i < laneMarkers.length; i++) {
		var marker = laneMarkers[i];
		marker.y += gameSpeed;
		if (marker.y > 2732) {
			marker.y -= 2400;
		}
	}
	// Spawn enemy cars and obstacles, ensuring no overlap with any existing object
	if (ticksSinceStart - lastSpawnTick > (game._spawnInterval || 36)) {
		lastSpawnTick = ticksSinceStart;
		// Randomly pick lanes to spawn cars/obstacles, but never all 4 at once
		var spawnLanes = [];
		for (var i = 0; i < laneCount; i++) {
			if (Math.random() < 0.5) spawnLanes.push(i);
		}
		// Never allow all 4 lanes to be filled at once
		if (spawnLanes.length > 3) {
			// Randomly remove one lane to ensure max 3
			var idxToRemove = Math.floor(Math.random() * spawnLanes.length);
			spawnLanes.splice(idxToRemove, 1);
		}
		if (spawnLanes.length == 0) spawnLanes.push(Math.floor(Math.random() * laneCount));
		// Limit to max 3 obstacles per spawn
		var obstacleCountThisSpawn = 0;
		// Track which lanes will have obstacles this spawn
		var obstacleLanesThisSpawn = [];
		// Track which lanes are used (to prevent both enemy and obstacle in same lane)
		var usedLanes = {};
		// Track all new objects to check for overlap
		var newObjects = [];
		for (var i = 0; i < spawnLanes.length; i++) {
			var laneIdx = spawnLanes[i];
			// If already 3 obstacles, force enemy car for the rest
			var forceEnemy = obstacleCountThisSpawn >= 3;
			// Only allow one object per lane (no overlap of enemy/obstacle)
			if (usedLanes[laneIdx]) continue;
			// Determine spawn Y and type
			var spawnY,
				obj,
				isObstacle = false;
			if (!forceEnemy && Math.random() >= 0.7) {
				// Obstacle
				obj = new Obstacle();
				obj.x = laneCenters[laneIdx];
				obj.y = -100;
				obj.speed = gameSpeed;
				obj.lane = laneIdx;
				spawnY = obj.y;
				isObstacle = true;
			} else {
				// Enemy car
				obj = new EnemyCar();
				obj.x = laneCenters[laneIdx];
				obj.y = -200;
				obj.speed = gameSpeed;
				obj.lane = laneIdx;
				spawnY = obj.y;
			}
			// Check for overlap with all existing objects (enemyCars, obstacles, bonuses) and newObjects
			var overlap = false;
			var objBounds = obj.getBounds();
			// Check with existing enemy cars
			for (var j = 0; j < enemyCars.length; j++) {
				if (enemyCars[j].lane === laneIdx) {
					var other = enemyCars[j];
					var otherBounds = other.getBounds();
					if (!(objBounds.x + objBounds.width < otherBounds.x || objBounds.x > otherBounds.x + otherBounds.width || objBounds.y + objBounds.height < otherBounds.y || objBounds.y > otherBounds.y + otherBounds.height)) {
						overlap = true;
						break;
					}
				}
			}
			// Check with existing obstacles
			if (!overlap) {
				for (var j = 0; j < obstacles.length; j++) {
					if (obstacles[j].lane === laneIdx) {
						var other = obstacles[j];
						var otherBounds = other.getBounds();
						if (!(objBounds.x + objBounds.width < otherBounds.x || objBounds.x > otherBounds.x + otherBounds.width || objBounds.y + objBounds.height < otherBounds.y || objBounds.y > otherBounds.y + otherBounds.height)) {
							overlap = true;
							break;
						}
					}
				}
			}
			// Check with existing bonuses
			if (!overlap) {
				for (var j = 0; j < bonuses.length; j++) {
					if (bonuses[j].lane === laneIdx) {
						var other = bonuses[j];
						var otherBounds = other.getBounds();
						if (!(objBounds.x + objBounds.width < otherBounds.x || objBounds.x > otherBounds.x + otherBounds.width || objBounds.y + objBounds.height < otherBounds.y || objBounds.y > otherBounds.y + otherBounds.height)) {
							overlap = true;
							break;
						}
					}
				}
			}
			// Check with new objects in this spawn
			if (!overlap) {
				for (var j = 0; j < newObjects.length; j++) {
					if (newObjects[j].lane === laneIdx) {
						var other = newObjects[j];
						var otherBounds = other.getBounds();
						if (!(objBounds.x + objBounds.width < otherBounds.x || objBounds.x > otherBounds.x + otherBounds.width || objBounds.y + objBounds.height < otherBounds.y || objBounds.y > otherBounds.y + otherBounds.height)) {
							overlap = true;
							break;
						}
					}
				}
			}
			if (overlap) {
				// Don't spawn this object
				if (obj && obj.destroy) obj.destroy();
				continue;
			}
			// No overlap, spawn
			if (isObstacle) {
				obstacles.push(obj);
				game.addChild(obj);
				// Animate obstacle spawn (scale in)
				obj.scaleX = obj.scaleY = 0.2;
				tween(obj, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 300,
					easing: tween.easeOutBack
				});
				obstacleCountThisSpawn++;
				obstacleLanesThisSpawn.push(laneIdx);
				usedLanes[laneIdx] = true;
			} else {
				enemyCars.push(obj);
				game.addChild(obj);
				usedLanes[laneIdx] = true;
				// Animate enemy car spawn (scale in)
				obj.scaleX = obj.scaleY = 0.2;
				tween(obj, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 300,
					easing: tween.easeOutBack
				});
			}
			newObjects.push(obj);
		}
		// Store obstacle lanes for this tick for bonus spawn logic
		game._obstacleLanesThisSpawn = obstacleLanesThisSpawn;
	} else {
		// If not spawning this tick, clear obstacle lanes
		game._obstacleLanesThisSpawn = [];
	}
	// Spawn bonus, ensuring no overlap with any object
	// Increased spawn frequency: every 90 ticks (was 180), and higher probability (was 0.5, now 0.85)
	if (ticksSinceStart - lastBonusTick > 90 && Math.random() < 0.85) {
		lastBonusTick = ticksSinceStart;
		// Prevent bonus from spawning in a lane with an obstacle this tick
		var availableBonusLanes = [];
		// Only consider the two center lanes as "most accessible" for the player
		var preferredLanes = [1, 2];
		for (var i = 0; i < laneCount; i++) {
			var blocked = false;
			if (game._obstacleLanesThisSpawn) {
				for (var j = 0; j < game._obstacleLanesThisSpawn.length; j++) {
					if (game._obstacleLanesThisSpawn[j] === i) {
						blocked = true;
						break;
					}
				}
			}
			// Check for overlap with any object in this lane at spawn Y
			if (!blocked) {
				var testBonus = new Bonus();
				testBonus.x = laneCenters[i];
				testBonus.y = -100;
				testBonus.lane = i;
				var testBounds = testBonus.getBounds();
				// Check with enemy cars
				for (var j = 0; j < enemyCars.length; j++) {
					if (enemyCars[j].lane === i) {
						var other = enemyCars[j];
						var otherBounds = other.getBounds();
						if (!(testBounds.x + testBounds.width < otherBounds.x || testBounds.x > otherBounds.x + otherBounds.width || testBounds.y + testBounds.height < otherBounds.y || testBounds.y > otherBounds.y + otherBounds.height)) {
							blocked = true;
							break;
						}
					}
				}
				// Check with obstacles
				if (!blocked) {
					for (var j = 0; j < obstacles.length; j++) {
						if (obstacles[j].lane === i) {
							var other = obstacles[j];
							var otherBounds = other.getBounds();
							if (!(testBounds.x + testBounds.width < otherBounds.x || testBounds.x > otherBounds.x + otherBounds.width || testBounds.y + testBounds.height < otherBounds.y || testBounds.y > otherBounds.y + otherBounds.height)) {
								blocked = true;
								break;
							}
						}
					}
				}
				// Check with bonuses
				if (!blocked) {
					for (var j = 0; j < bonuses.length; j++) {
						if (bonuses[j].lane === i) {
							var other = bonuses[j];
							var otherBounds = other.getBounds();
							if (!(testBounds.x + testBounds.width < otherBounds.x || testBounds.x > otherBounds.x + otherBounds.width || testBounds.y + testBounds.height < otherBounds.y || testBounds.y > otherBounds.y + otherBounds.height)) {
								blocked = true;
								break;
							}
						}
					}
				}
				if (!blocked) availableBonusLanes.push(i);
				if (testBonus && testBonus.destroy) testBonus.destroy();
			}
		}
		// Prefer to spawn in center lanes if available, else fallback to any available
		var spawnLanes = [];
		for (var i = 0; i < availableBonusLanes.length; i++) {
			if (preferredLanes.indexOf(availableBonusLanes[i]) !== -1) {
				spawnLanes.push(availableBonusLanes[i]);
			}
		}
		if (spawnLanes.length === 0) spawnLanes = availableBonusLanes;
		if (spawnLanes.length > 0) {
			var laneIdx = spawnLanes[Math.floor(Math.random() * spawnLanes.length)];
			var b = new Bonus();
			b.x = laneCenters[laneIdx];
			b.y = -100;
			b.speed = gameSpeed;
			b.lane = laneIdx;
			bonuses.push(b);
			game.addChild(b);
			// Highlight the bonus visually when it spawns
			b.scaleX = b.scaleY = 1.5;
			tween(b, {
				scaleX: 1,
				scaleY: 1
			}, {
				duration: 400,
				easing: tween.easeOutBack
			});
			LK.effects.flashObject(b, 0xFFFA00, 400);
		}
	}
	// Move enemy cars
	var _loop = function _loop() {
			e = enemyCars[i];
			e.update();
			if (e.y > 2732 + 200) {
				e.destroy();
				enemyCars.splice(i, 1);
				return 0; // continue
			}
			// Collision with player
			if (intersects(player, e)) {
				if (!lastCrash) {
					var _shake = function shake(times) {
						if (times <= 0) {
							player.x = origX;
							player.y = origY;
							return;
						}
						var dx = (Math.random() - 0.5) * 30;
						var dy = (Math.random() - 0.5) * 18;
						tween(player, {
							x: origX + dx,
							y: origY + dy
						}, {
							duration: 40,
							easing: tween.linear,
							onFinish: function onFinish() {
								_shake(times - 1);
							}
						});
					};
					if (player._invincible) {
						// Invincible: just destroy enemy, no crash
						LK.effects.flashObject(player, 0xFFD700, 400);
						enemyCars.splice(i, 1);
						e.destroy();
						return 0; // continue
					}
					if (player._shield) {
						player._shield = 0;
						LK.effects.flashObject(player, 0x42a5f5, 600);
						enemyCars.splice(i, 1);
						e.destroy();
						return 0; // continue
					}
					LK.getSound('crash').play();
					LK.effects.flashScreen(0xff0000, 800);
					// Shake player car on crash
					origX = player.x;
					origY = player.y;
					_shake(8);
					lastCrash = true;
					LK.getSound('gameover').play();
					LK.showGameOver();
					return {
						v: void 0
					};
				}
			}
		},
		e,
		origX,
		origY,
		_ret;
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		_ret = _loop();
		if (_ret === 0) continue;
		if (_ret) return _ret.v;
	}
	// Move obstacles
	var _loop2 = function _loop2() {
			o = obstacles[i];
			o.update();
			if (o.y > 2732 + 100) {
				o.destroy();
				obstacles.splice(i, 1);
				return 0; // continue
			}
			// Collision with player
			if (intersects(player, o)) {
				if (!lastCrash) {
					var _shake2 = function shake(times) {
						if (times <= 0) {
							player.x = origX;
							player.y = origY;
							return;
						}
						var dx = (Math.random() - 0.5) * 30;
						var dy = (Math.random() - 0.5) * 18;
						tween(player, {
							x: origX + dx,
							y: origY + dy
						}, {
							duration: 40,
							easing: tween.linear,
							onFinish: function onFinish() {
								_shake2(times - 1);
							}
						});
					};
					if (player._invincible) {
						// Invincible: just destroy obstacle, no crash
						LK.effects.flashObject(player, 0xFFD700, 400);
						obstacles.splice(i, 1);
						o.destroy();
						return 0; // continue
					}
					if (player._shield) {
						player._shield = 0;
						LK.effects.flashObject(player, 0x42a5f5, 600);
						obstacles.splice(i, 1);
						o.destroy();
						return 0; // continue
					}
					LK.getSound('crash').play();
					LK.effects.flashScreen(0xff0000, 800);
					// Shake player car on crash
					origX = player.x;
					origY = player.y;
					_shake2(8);
					lastCrash = true;
					LK.getSound('gameover').play();
					LK.showGameOver();
					return {
						v: void 0
					};
				}
			}
		},
		o,
		origX,
		origY,
		_ret2;
	for (var i = obstacles.length - 1; i >= 0; i--) {
		_ret2 = _loop2();
		if (_ret2 === 0) continue;
		if (_ret2) return _ret2.v;
	}
	// Move bonuses
	for (var i = bonuses.length - 1; i >= 0; i--) {
		var b = bonuses[i];
		b.update();
		// Add a pulsing effect to make the bonus more visible
		if (!b._pulseTween) {
			b._pulseTween = true;
			(function (bonusObj) {
				function pulseUp() {
					tween(bonusObj, {
						scaleX: 1.18,
						scaleY: 1.18
					}, {
						duration: 350,
						easing: tween.easeInOutSine,
						onFinish: pulseDown
					});
				}
				function pulseDown() {
					tween(bonusObj, {
						scaleX: 1,
						scaleY: 1
					}, {
						duration: 350,
						easing: tween.easeInOutSine,
						onFinish: pulseUp
					});
				}
				pulseUp();
			})(b);
		}
		if (b.y > 2732 + 100) {
			b.destroy();
			bonuses.splice(i, 1);
			continue;
		}
		// Collision with player
		if (intersects(player, b)) {
			if (b.type === 'shield') {
				player._shield = 1;
				LK.getSound('shield').play();
				LK.effects.flashObject(player, 0x42a5f5, 600);
				bonusTxt.setText("🛡️ SHIELD! (Shield Bonus)");
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					t.scaleX = t.scaleY = 1.4;
					tween(t, {
						scaleX: 1,
						scaleY: 1,
						alpha: 0
					}, {
						duration: 900,
						easing: tween.easeOutBack,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'double') {
				player._doubleScore = 1;
				player._doubleScoreTicks = 600; // 10 seconds at 60fps
				LK.getSound('double').play();
				LK.effects.flashObject(player, 0xffd600, 600);
				bonusTxt.setText("✨ x2 SCORE! (Double Score Bonus)");
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					t.scaleX = t.scaleY = 1.4;
					tween(t, {
						scaleX: 1,
						scaleY: 1,
						alpha: 0
					}, {
						duration: 900,
						easing: tween.easeOutBack,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'slowmo') {
				// Slow motion: halve gameSpeed for 6 seconds
				if (!game._slowmoTicks || game._slowmoTicks <= 0) {
					game._origGameSpeed = gameSpeed;
					gameSpeed = Math.max(8, Math.floor(gameSpeed / 2));
					game._slowmoTicks = 360;
					LK.getSound('slowmo').play();
					bonusTxt.setText("🐢 SLOW-MO! (Everything slows down)");
					LK.effects.flashObject(player, 0x80cbc4, 600);
					(function () {
						var t = bonusTxt;
						t.alpha = 1;
						t.scaleX = t.scaleY = 1.4;
						tween(t, {
							scaleX: 1,
							scaleY: 1,
							alpha: 0
						}, {
							duration: 1200,
							easing: tween.easeOutBack,
							onFinish: function onFinish() {
								t.setText('');
							}
						});
					})();
				}
			} else if (b.type === 'shrink') {
				// Shrink player for 8 seconds
				if (!player._shrinkTicks || player._shrinkTicks <= 0) {
					player._shrinkTicks = 480;
					player.scaleX = player.scaleY = 0.35;
					player.width = player._carAsset.width * 0.35;
					player.height = player._carAsset.height * 0.35;
					LK.getSound('shrink').play();
					bonusTxt.setText("🚗💨 SHRINK! (Tiny car!)");
					LK.effects.flashObject(player, 0xf48fb1, 600);
					(function () {
						var t = bonusTxt;
						t.alpha = 1;
						tween(t, {
							alpha: 0
						}, {
							duration: 1200,
							easing: tween.linear,
							onFinish: function onFinish() {
								t.setText('');
							}
						});
					})();
				}
			} else if (b.type === 'invincible') {
				// Invincible for 7 seconds
				player._invincible = 1;
				player._invincibleTicks = 420;
				LK.getSound('invincible').play();
				bonusTxt.setText("💥 INVINCIBLE! (Can't crash!)");
				LK.effects.flashObject(player, 0xFFD700, 600);
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					tween(t, {
						alpha: 0
					}, {
						duration: 1200,
						easing: tween.linear,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'teleport') {
				// Teleport player to random lane
				var oldLane = -1;
				for (var li = 0; li < laneCenters.length; li++) {
					if (Math.abs(player.x - laneCenters[li]) < laneWidth / 2) oldLane = li;
				}
				var newLane = oldLane;
				while (newLane === oldLane) {
					newLane = Math.floor(Math.random() * laneCenters.length);
				}
				player.x = laneCenters[newLane];
				LK.getSound('teleport').play();
				bonusTxt.setText("🌀 TELEPORT! (Random lane)");
				LK.effects.flashObject(player, 0x4fc3f7, 600);
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					tween(t, {
						alpha: 0
					}, {
						duration: 1200,
						easing: tween.linear,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'clear') {
				// Clear all obstacles and enemy cars
				for (var ci = enemyCars.length - 1; ci >= 0; ci--) {
					enemyCars[ci].destroy();
					enemyCars.splice(ci, 1);
				}
				for (var oi = obstacles.length - 1; oi >= 0; oi--) {
					obstacles[oi].destroy();
					obstacles.splice(oi, 1);
				}
				LK.getSound('clear').play();
				bonusTxt.setText("🧹 CLEAR! (All obstacles gone)");
				LK.effects.flashObject(player, 0x81d4fa, 600);
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					tween(t, {
						alpha: 0
					}, {
						duration: 1200,
						easing: tween.linear,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'magnet') {
				// Magnet: attract bonuses for 8 seconds
				player._magnetTicks = 480;
				LK.getSound('magnet').play();
				bonusTxt.setText("🧲 MAGNET! (Bonuses come to you)");
				LK.effects.flashObject(player, 0xff8a65, 600);
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					tween(t, {
						alpha: 0
					}, {
						duration: 1200,
						easing: tween.linear,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type === 'reverse') {
				// Reverse: enemies move up for 5 seconds
				game._reverseTicks = 300;
				LK.getSound('reverse').play();
				bonusTxt.setText("🔄 REVERSE! (Enemies go up!)");
				LK.effects.flashObject(player, 0xba68c8, 600);
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					tween(t, {
						alpha: 0
					}, {
						duration: 1200,
						easing: tween.linear,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else if (b.type.indexOf('score') === 0) {
				// All score bonuses
				var addScore = 100;
				// Optionally, make higher-numbered bonuses worth more
				var idx = 0;
				if (b.type.length > 5) {
					idx = parseInt(b.type.substring(5), 10) - 1;
					if (isNaN(idx) || idx < 0) idx = 0;
				}
				addScore += idx * 10; // e.g. score17 gives 100+16*10=260
				if (player._doubleScore) addScore *= 2;
				bonusScore += addScore;
				score += addScore;
				LK.getSound('bonus').play();
				LK.effects.flashObject(player, 0x43a047, 400);
				bonusTxt.setText("💰 +" + addScore + "! (Bonus " + b.type.replace('score', '') + ")");
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					t.scaleX = t.scaleY = 1.4;
					tween(t, {
						scaleX: 1,
						scaleY: 1,
						alpha: 0
					}, {
						duration: 900,
						easing: tween.easeOutBack,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			} else {
				// fallback
				var addScore = 100;
				if (player._doubleScore) addScore *= 2;
				bonusScore += addScore;
				score += addScore;
				LK.getSound('bonus').play();
				LK.effects.flashObject(player, 0x43a047, 400);
				bonusTxt.setText("💰 +" + addScore + "! (Score Bonus)");
				(function () {
					var t = bonusTxt;
					t.alpha = 1;
					t.scaleX = t.scaleY = 1.4;
					tween(t, {
						scaleX: 1,
						scaleY: 1,
						alpha: 0
					}, {
						duration: 900,
						easing: tween.easeOutBack,
						onFinish: function onFinish() {
							t.setText('');
						}
					});
				})();
			}
			b.destroy();
			bonuses.splice(i, 1);
		}
	}
	// Score increases with distance
	if (!lastCrash) {
		var addScore = Math.floor(gameSpeed / 2);
		if (player._doubleScore) addScore *= 2;
		score += addScore;
		scoreTxt.setText(score + "");
		// Animate score text on score increase
		scoreTxt.scaleX = scoreTxt.scaleY = 1.25;
		tween(scoreTxt, {
			scaleX: 1,
			scaleY: 1
		}, {
			duration: 220,
			easing: tween.easeOutBack
		});
		// Handle double score timer
		if (player._doubleScore) {
			player._doubleScoreTicks--;
			if (player._doubleScoreTicks <= 0) {
				player._doubleScore = 0;
				player._doubleScoreTicks = 0;
			}
		}
		// Handle slowmo timer
		if (game._slowmoTicks && game._slowmoTicks > 0) {
			game._slowmoTicks--;
			if (game._slowmoTicks === 0 && typeof game._origGameSpeed !== "undefined") {
				gameSpeed = game._origGameSpeed;
				game._origGameSpeed = undefined;
			}
		}
		// Handle shrink timer
		if (player._shrinkTicks && player._shrinkTicks > 0) {
			player._shrinkTicks--;
			if (player._shrinkTicks === 0) {
				player.scaleX = player.scaleY = 0.55;
				// Restore width/height to original (not cumulative shrink)
				player.width = player._carAsset.width * 0.55;
				player.height = player._carAsset.height * 0.55;
			}
		}
		// Handle invincible timer
		if (player._invincible && player._invincibleTicks > 0) {
			player._invincibleTicks--;
			if (player._invincibleTicks === 0) {
				player._invincible = 0;
			}
		}
		// Handle magnet timer
		if (player._magnetTicks && player._magnetTicks > 0) {
			player._magnetTicks--;
			// Attract bonuses
			for (var mi = 0; mi < bonuses.length; mi++) {
				var bonusObj = bonuses[mi];
				var dx = player.x - bonusObj.x;
				var dy = player.y - bonusObj.y;
				var dist = Math.sqrt(dx * dx + dy * dy);
				if (dist < 600) {
					// Move bonus towards player
					bonusObj.x += dx * 0.08;
					bonusObj.y += dy * 0.08;
				}
			}
			if (player._magnetTicks === 0) {
				// End magnet
			}
		}
		// Handle reverse timer
		if (game._reverseTicks && game._reverseTicks > 0) {
			game._reverseTicks--;
			// Reverse enemy and obstacle movement
			if (!game._reverseExplodeQueue) game._reverseExplodeQueue = {
				enemies: [],
				obstacles: []
			};
			for (var ri = enemyCars.length - 1; ri >= 0; ri--) {
				var e = enemyCars[ri];
				e.y -= gameSpeed * 2;
				// If enemy car goes off the top, queue for explosion after reverse ends
				if (e.y + e.height / 2 < -100) {
					game._reverseExplodeQueue.enemies.push(e);
					enemyCars.splice(ri, 1);
				}
			}
			for (var ro = obstacles.length - 1; ro >= 0; ro--) {
				var o = obstacles[ro];
				o.y -= gameSpeed * 2;
				// If obstacle goes off the top, queue for explosion after reverse ends
				if (o.y + o.height / 2 < -100) {
					game._reverseExplodeQueue.obstacles.push(o);
					obstacles.splice(ro, 1);
				}
			}
			if (game._reverseTicks === 0) {
				// End reverse: now explode all queued enemies and obstacles
				if (game._reverseExplodeQueue) {
					// Explode enemy cars
					for (var i = 0; i < game._reverseExplodeQueue.enemies.length; i++) {
						var e = game._reverseExplodeQueue.enemies[i];
						LK.getSound('crash').play();
						// Explosion effect: scale up, fade out, flash red
						LK.effects.flashObject(e, 0xff0000, 200);
						tween(e, {
							scaleX: 1.7,
							scaleY: 1.7,
							alpha: 0
						}, {
							duration: 350,
							easing: tween.easeOutCubic,
							onFinish: function (obj) {
								return function () {
									obj.destroy();
								};
							}(e)
						});
					}
					// Explode obstacles
					for (var i = 0; i < game._reverseExplodeQueue.obstacles.length; i++) {
						var o = game._reverseExplodeQueue.obstacles[i];
						LK.getSound('crash').play();
						LK.effects.flashObject(o, 0xff0000, 200);
						tween(o, {
							scaleX: 1.7,
							scaleY: 1.7,
							alpha: 0
						}, {
							duration: 350,
							easing: tween.easeOutCubic,
							onFinish: function (obj) {
								return function () {
									obj.destroy();
								};
							}(o)
						});
					}
					game._reverseExplodeQueue = null;
				}
			}
		}
		// --- Update bonus icon position and state ---
		bonusIcon.x = player.x;
		bonusIcon.y = player.y - player.height / 2 - 30;
		// Determine which bonus is active and show icon
		var showIcon = '';
		if (player._invincible && player._invincibleTicks > 0) {
			showIcon = '🦾';
			bonusIcon.setText('🦾');
			bonusIcon.alpha = 1;
		} else if (player._shield) {
			showIcon = '🛡️';
			bonusIcon.setText('🛡️');
			bonusIcon.alpha = 1;
		} else if (player._doubleScore && player._doubleScoreTicks > 0) {
			showIcon = '✨';
			bonusIcon.setText('✨');
			bonusIcon.alpha = 1;
		} else if (player._shrinkTicks && player._shrinkTicks > 0) {
			showIcon = '🔽';
			bonusIcon.setText('🔽');
			bonusIcon.alpha = 1;
		} else if (player._magnetTicks && player._magnetTicks > 0) {
			showIcon = '🧲';
			bonusIcon.setText('🧲');
			bonusIcon.alpha = 1;
		} else if (game._slowmoTicks && game._slowmoTicks > 0) {
			showIcon = '🐢';
			bonusIcon.setText('🐢');
			bonusIcon.alpha = 1;
		} else if (game._reverseTicks && game._reverseTicks > 0) {
			showIcon = '🔄';
			bonusIcon.setText('🔄');
			bonusIcon.alpha = 1;
		} else {
			bonusIcon.setText('');
			bonusIcon.alpha = 0;
		}
		// Play win sound if score threshold reached (example: 10000)
		if (score >= 10000 && !game._winSoundPlayed) {
			LK.getSound('win').play();
			game._winSoundPlayed = true;
		}
	}
};
// Reset crash state on new game
LK.on('gameStart', function () {
	lastCrash = false;
	score = 0;
	bonusScore = 0;
	scoreTxt.setText('0');
	bonusTxt.setText('');
	// Remove all cars, obstacles, bonuses
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		enemyCars[i].destroy();
		enemyCars.splice(i, 1);
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroy();
		obstacles.splice(i, 1);
	}
	for (var i = bonuses.length - 1; i >= 0; i--) {
		bonuses[i].destroy();
		bonuses.splice(i, 1);
	}
	playerTargetLane = 1;
	player.x = laneCenters[1];
	player.y = 2732 - 500;
	if (playerMoveTween && playerMoveTween.cancel) playerMoveTween.cancel();
	player._shield = 0;
	player._doubleScore = 0;
	player._doubleScoreTicks = 0;
	player._shrinkTicks = 0;
	player._invincible = 0;
	player._invincibleTicks = 0;
	player._magnetTicks = 0;
	player.scaleX = player.scaleY = 0.55;
	player.width = player._carAsset.width * 0.55;
	player.height = player._carAsset.height * 0.55;
	game._slowmoTicks = 0;
	game._reverseTicks = 0;
	gameSpeed = 18;
	ticksSinceStart = 0;
	lastSpawnTick = 0;
	lastBonusTick = 0;
	game._spawnInterval = 36; // Easy stage spawn interval
	// Reset bonus icon
	if (typeof bonusIcon !== "undefined") {
		bonusIcon.setText('');
		bonusIcon.alpha = 0;
	}
});
// Prevent player from moving into top left menu area
// (handled by roadLeft, but double check)
if (roadLeft < 100) {
	roadLeft = 100;
	roadWidth = roadRight - roadLeft;
	laneWidth = roadWidth / laneCount;
	for (var i = 0; i < laneCount; i++) {
		laneCenters[i] = roadLeft + laneWidth / 2 + i * laneWidth;
	}
}
// Play background music and engine idle at game start
LK.on('gameStart', function () {
	LK.playMusic('bgmusic');
	LK.getSound('engine_idle').play();
});

===================================================================
--- original.js
+++ change.js
@@ -160,25 +160,28 @@
 					}
 				}
 			}
 		}
-		// If currently changing lane, interpolate X toward new lane center
+		// If currently changing lane, animate X toward new lane center using tween
 		if (self._isChangingLane) {
-			self._laneChangeProgress++;
-			var t = self._laneChangeProgress / self._laneChangeDuration;
-			if (t > 1) t = 1;
-			var startX = self._laneChangeStartX;
-			var endX = laneCenters[self._targetLane];
-			// Smooth interpolation (ease in/out)
-			var easeT = t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
-			self.x = startX + (endX - startX) * easeT;
-			if (t >= 1) {
-				self.x = endX;
-				self.lane = self._targetLane;
-				self._isChangingLane = false;
-				self._laneChangeCooldown = 60 + Math.floor(Math.random() * 60); // Wait 1-2 seconds before next change
+			if (!self._laneTweenStarted) {
+				self._laneTweenStarted = true;
+				tween(self, {
+					x: laneCenters[self._targetLane]
+				}, {
+					duration: self._laneChangeDuration * 16,
+					easing: tween.easeInOutSine,
+					onFinish: function onFinish() {
+						self.x = laneCenters[self._targetLane];
+						self.lane = self._targetLane;
+						self._isChangingLane = false;
+						self._laneChangeCooldown = 60 + Math.floor(Math.random() * 60);
+						self._laneTweenStarted = false;
+					}
+				});
 			}
 		} else {
+			self._laneTweenStarted = false;
 			// Not changing lane, decrement cooldown if needed
 			if (self._laneChangeCooldown > 0) self._laneChangeCooldown--;
 		}
 		// Update lastX and lastY for next frame
@@ -502,10 +505,20 @@
 			// Play lane change sound if player changed lane (by X)
 			if (Math.abs(player.x - newX) > laneWidth * 0.8) {
 				LK.getSound('lane_change').play();
 			}
-			player.x = newX;
-			player.y = newY;
+			// Animate player car movement for smooth drag
+			tween.stop(player, {
+				x: true,
+				y: true
+			});
+			tween(player, {
+				x: newX,
+				y: newY
+			}, {
+				duration: 80,
+				easing: tween.easeOutCubic
+			});
 		}
 	}
 };
 game.up = function (x, y, obj) {
@@ -684,15 +697,33 @@
 			// No overlap, spawn
 			if (isObstacle) {
 				obstacles.push(obj);
 				game.addChild(obj);
+				// Animate obstacle spawn (scale in)
+				obj.scaleX = obj.scaleY = 0.2;
+				tween(obj, {
+					scaleX: 1,
+					scaleY: 1
+				}, {
+					duration: 300,
+					easing: tween.easeOutBack
+				});
 				obstacleCountThisSpawn++;
 				obstacleLanesThisSpawn.push(laneIdx);
 				usedLanes[laneIdx] = true;
 			} else {
 				enemyCars.push(obj);
 				game.addChild(obj);
 				usedLanes[laneIdx] = true;
+				// Animate enemy car spawn (scale in)
+				obj.scaleX = obj.scaleY = 0.2;
+				tween(obj, {
+					scaleX: 1,
+					scaleY: 1
+				}, {
+					duration: 300,
+					easing: tween.easeOutBack
+				});
 			}
 			newObjects.push(obj);
 		}
 		// Store obstacle lanes for this tick for bonus spawn logic
@@ -796,76 +827,144 @@
 			LK.effects.flashObject(b, 0xFFFA00, 400);
 		}
 	}
 	// Move enemy cars
-	for (var i = enemyCars.length - 1; i >= 0; i--) {
-		var e = enemyCars[i];
-		e.update();
-		if (e.y > 2732 + 200) {
-			e.destroy();
-			enemyCars.splice(i, 1);
-			continue;
-		}
-		// Collision with player
-		if (intersects(player, e)) {
-			if (!lastCrash) {
-				if (player._invincible) {
-					// Invincible: just destroy enemy, no crash
-					LK.effects.flashObject(player, 0xFFD700, 400);
-					enemyCars.splice(i, 1);
-					e.destroy();
-					continue;
+	var _loop = function _loop() {
+			e = enemyCars[i];
+			e.update();
+			if (e.y > 2732 + 200) {
+				e.destroy();
+				enemyCars.splice(i, 1);
+				return 0; // continue
+			}
+			// Collision with player
+			if (intersects(player, e)) {
+				if (!lastCrash) {
+					var _shake = function shake(times) {
+						if (times <= 0) {
+							player.x = origX;
+							player.y = origY;
+							return;
+						}
+						var dx = (Math.random() - 0.5) * 30;
+						var dy = (Math.random() - 0.5) * 18;
+						tween(player, {
+							x: origX + dx,
+							y: origY + dy
+						}, {
+							duration: 40,
+							easing: tween.linear,
+							onFinish: function onFinish() {
+								_shake(times - 1);
+							}
+						});
+					};
+					if (player._invincible) {
+						// Invincible: just destroy enemy, no crash
+						LK.effects.flashObject(player, 0xFFD700, 400);
+						enemyCars.splice(i, 1);
+						e.destroy();
+						return 0; // continue
+					}
+					if (player._shield) {
+						player._shield = 0;
+						LK.effects.flashObject(player, 0x42a5f5, 600);
+						enemyCars.splice(i, 1);
+						e.destroy();
+						return 0; // continue
+					}
+					LK.getSound('crash').play();
+					LK.effects.flashScreen(0xff0000, 800);
+					// Shake player car on crash
+					origX = player.x;
+					origY = player.y;
+					_shake(8);
+					lastCrash = true;
+					LK.getSound('gameover').play();
+					LK.showGameOver();
+					return {
+						v: void 0
+					};
 				}
-				if (player._shield) {
-					player._shield = 0;
-					LK.effects.flashObject(player, 0x42a5f5, 600);
-					enemyCars.splice(i, 1);
-					e.destroy();
-					continue;
-				}
-				LK.getSound('crash').play();
-				LK.effects.flashScreen(0xff0000, 800);
-				lastCrash = true;
-				LK.getSound('gameover').play();
-				LK.showGameOver();
-				return;
 			}
-		}
+		},
+		e,
+		origX,
+		origY,
+		_ret;
+	for (var i = enemyCars.length - 1; i >= 0; i--) {
+		_ret = _loop();
+		if (_ret === 0) continue;
+		if (_ret) return _ret.v;
 	}
 	// Move obstacles
-	for (var i = obstacles.length - 1; i >= 0; i--) {
-		var o = obstacles[i];
-		o.update();
-		if (o.y > 2732 + 100) {
-			o.destroy();
-			obstacles.splice(i, 1);
-			continue;
-		}
-		// Collision with player
-		if (intersects(player, o)) {
-			if (!lastCrash) {
-				if (player._invincible) {
-					// Invincible: just destroy obstacle, no crash
-					LK.effects.flashObject(player, 0xFFD700, 400);
-					obstacles.splice(i, 1);
-					o.destroy();
-					continue;
+	var _loop2 = function _loop2() {
+			o = obstacles[i];
+			o.update();
+			if (o.y > 2732 + 100) {
+				o.destroy();
+				obstacles.splice(i, 1);
+				return 0; // continue
+			}
+			// Collision with player
+			if (intersects(player, o)) {
+				if (!lastCrash) {
+					var _shake2 = function shake(times) {
+						if (times <= 0) {
+							player.x = origX;
+							player.y = origY;
+							return;
+						}
+						var dx = (Math.random() - 0.5) * 30;
+						var dy = (Math.random() - 0.5) * 18;
+						tween(player, {
+							x: origX + dx,
+							y: origY + dy
+						}, {
+							duration: 40,
+							easing: tween.linear,
+							onFinish: function onFinish() {
+								_shake2(times - 1);
+							}
+						});
+					};
+					if (player._invincible) {
+						// Invincible: just destroy obstacle, no crash
+						LK.effects.flashObject(player, 0xFFD700, 400);
+						obstacles.splice(i, 1);
+						o.destroy();
+						return 0; // continue
+					}
+					if (player._shield) {
+						player._shield = 0;
+						LK.effects.flashObject(player, 0x42a5f5, 600);
+						obstacles.splice(i, 1);
+						o.destroy();
+						return 0; // continue
+					}
+					LK.getSound('crash').play();
+					LK.effects.flashScreen(0xff0000, 800);
+					// Shake player car on crash
+					origX = player.x;
+					origY = player.y;
+					_shake2(8);
+					lastCrash = true;
+					LK.getSound('gameover').play();
+					LK.showGameOver();
+					return {
+						v: void 0
+					};
 				}
-				if (player._shield) {
-					player._shield = 0;
-					LK.effects.flashObject(player, 0x42a5f5, 600);
-					obstacles.splice(i, 1);
-					o.destroy();
-					continue;
-				}
-				LK.getSound('crash').play();
-				LK.effects.flashScreen(0xff0000, 800);
-				lastCrash = true;
-				LK.getSound('gameover').play();
-				LK.showGameOver();
-				return;
 			}
-		}
+		},
+		o,
+		origX,
+		origY,
+		_ret2;
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		_ret2 = _loop2();
+		if (_ret2 === 0) continue;
+		if (_ret2) return _ret2.v;
 	}
 	// Move bonuses
 	for (var i = bonuses.length - 1; i >= 0; i--) {
 		var b = bonuses[i];
@@ -911,13 +1010,16 @@
 				bonusTxt.setText("🛡️ SHIELD! (Shield Bonus)");
 				(function () {
 					var t = bonusTxt;
 					t.alpha = 1;
+					t.scaleX = t.scaleY = 1.4;
 					tween(t, {
+						scaleX: 1,
+						scaleY: 1,
 						alpha: 0
 					}, {
 						duration: 900,
-						easing: tween.linear,
+						easing: tween.easeOutBack,
 						onFinish: function onFinish() {
 							t.setText('');
 						}
 					});
@@ -930,13 +1032,16 @@
 				bonusTxt.setText("✨ x2 SCORE! (Double Score Bonus)");
 				(function () {
 					var t = bonusTxt;
 					t.alpha = 1;
+					t.scaleX = t.scaleY = 1.4;
 					tween(t, {
+						scaleX: 1,
+						scaleY: 1,
 						alpha: 0
 					}, {
 						duration: 900,
-						easing: tween.linear,
+						easing: tween.easeOutBack,
 						onFinish: function onFinish() {
 							t.setText('');
 						}
 					});
@@ -952,13 +1057,16 @@
 					LK.effects.flashObject(player, 0x80cbc4, 600);
 					(function () {
 						var t = bonusTxt;
 						t.alpha = 1;
+						t.scaleX = t.scaleY = 1.4;
 						tween(t, {
+							scaleX: 1,
+							scaleY: 1,
 							alpha: 0
 						}, {
 							duration: 1200,
-							easing: tween.linear,
+							easing: tween.easeOutBack,
 							onFinish: function onFinish() {
 								t.setText('');
 							}
 						});
@@ -1117,13 +1225,16 @@
 				bonusTxt.setText("💰 +" + addScore + "! (Bonus " + b.type.replace('score', '') + ")");
 				(function () {
 					var t = bonusTxt;
 					t.alpha = 1;
+					t.scaleX = t.scaleY = 1.4;
 					tween(t, {
+						scaleX: 1,
+						scaleY: 1,
 						alpha: 0
 					}, {
 						duration: 900,
-						easing: tween.linear,
+						easing: tween.easeOutBack,
 						onFinish: function onFinish() {
 							t.setText('');
 						}
 					});
@@ -1139,13 +1250,16 @@
 				bonusTxt.setText("💰 +" + addScore + "! (Score Bonus)");
 				(function () {
 					var t = bonusTxt;
 					t.alpha = 1;
+					t.scaleX = t.scaleY = 1.4;
 					tween(t, {
+						scaleX: 1,
+						scaleY: 1,
 						alpha: 0
 					}, {
 						duration: 900,
-						easing: tween.linear,
+						easing: tween.easeOutBack,
 						onFinish: function onFinish() {
 							t.setText('');
 						}
 					});
@@ -1160,8 +1274,17 @@
 		var addScore = Math.floor(gameSpeed / 2);
 		if (player._doubleScore) addScore *= 2;
 		score += addScore;
 		scoreTxt.setText(score + "");
+		// Animate score text on score increase
+		scoreTxt.scaleX = scoreTxt.scaleY = 1.25;
+		tween(scoreTxt, {
+			scaleX: 1,
+			scaleY: 1
+		}, {
+			duration: 220,
+			easing: tween.easeOutBack
+		});
 		// Handle double score timer
 		if (player._doubleScore) {
 			player._doubleScoreTicks--;
 			if (player._doubleScoreTicks <= 0) {