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

/**** 
* Classes
****/ 
var Obstacle = Container.expand(function (type) {
	var self = Container.call(this);
	self.type = type;
	var assetName = type === 'spike' ? 'spike' : type === 'cube' ? 'cubeEnemy' : 'barrier';
	var obstacleGraphics = self.attachAsset(assetName, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = gameSpeed;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = gameSpeed;
	self.collected = false;
	self.update = function () {
		self.y += self.speed;
		// Pulsing effect to make it stand out
		powerupGraphics.scaleX = 1 + Math.sin(LK.ticks * 0.1) * 0.2;
		powerupGraphics.scaleY = 1 + Math.sin(LK.ticks * 0.1) * 0.2;
		powerupGraphics.rotation += 0.05;
	};
	return self;
});
var Ring = Container.expand(function () {
	var self = Container.call(this);
	var ringGraphics = self.attachAsset('ring', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = gameSpeed;
	self.collected = false;
	self.update = function () {
		self.y += self.speed;
		ringGraphics.rotation += 0.1;
	};
	return self;
});
var SonicCharacter = Container.expand(function () {
	var self = Container.call(this);
	var characterGraphics = self.attachAsset('sonicCharacter', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.currentLane = 1; // 0 = left, 1 = center, 2 = right
	self.isJumping = false;
	self.isSliding = false;
	self.jumpStartY = 0;
	self.baseY = 0;
	self.isInvincible = false;
	self.invincibilityTimer = 0;
	self.activateInvincibility = function () {
		self.isInvincible = true;
		self.invincibilityTimer = LK.ticks + 300; // 5 seconds at 60fps
		// Visual effect - golden tint
		tween(characterGraphics, {
			tint: 0xFFD700
		}, {
			duration: 200
		});
		// Pulsing effect during invincibility
		self.invincibilityPulse();
	};
	self.invincibilityPulse = function () {
		if (self.isInvincible) {
			tween(characterGraphics, {
				alpha: 0.5
			}, {
				duration: 250,
				easing: tween.easeInOut,
				onFinish: function onFinish() {
					if (self.isInvincible) {
						tween(characterGraphics, {
							alpha: 1
						}, {
							duration: 250,
							easing: tween.easeInOut,
							onFinish: function onFinish() {
								self.invincibilityPulse();
							}
						});
					}
				}
			});
		}
	};
	self.deactivateInvincibility = function () {
		self.isInvincible = false;
		// Remove visual effects
		tween.stop(characterGraphics, {
			alpha: true
		});
		tween(characterGraphics, {
			tint: 0xFFFFFF,
			alpha: 1
		}, {
			duration: 200
		});
	};
	self.update = function () {
		// Check if invincibility should end
		if (self.isInvincible && LK.ticks >= self.invincibilityTimer) {
			self.deactivateInvincibility();
		}
	};
	self.moveTo = function (lane) {
		if (lane < 0 || lane > 2) return;
		self.currentLane = lane;
		var targetX = lanePositions[lane];
		tween(self, {
			x: targetX
		}, {
			duration: 200,
			easing: tween.easeOut
		});
	};
	self.jump = function () {
		if (self.isJumping || self.isSliding) return;
		self.isJumping = true;
		self.jumpStartY = self.y;
		LK.getSound('jump').play();
		tween(self, {
			y: self.jumpStartY - 150
		}, {
			duration: 300,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(self, {
					y: self.jumpStartY
				}, {
					duration: 300,
					easing: tween.easeIn,
					onFinish: function onFinish() {
						self.isJumping = false;
					}
				});
			}
		});
	};
	self.slide = function () {
		if (self.isJumping || self.isSliding) return;
		self.isSliding = true;
		var originalScale = characterGraphics.scaleY;
		characterGraphics.scaleY = 0.5;
		LK.setTimeout(function () {
			characterGraphics.scaleY = originalScale;
			self.isSliding = false;
		}, 500);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game variables
var gameSpeed = 8;
var speedIncrement = 0.02;
var lanePositions = [2048 * 0.25, 2048 * 0.5, 2048 * 0.75];
var obstacles = [];
var rings = [];
var powerups = [];
var lastObstacleSpawn = 0;
var lastRingSpawn = 0;
var lastPowerupSpawn = 0;
var ringCount = 0;
var gameDistance = 0;
// Create lanes visual
for (var i = 0; i < 3; i++) {
	var lane = LK.getAsset('lane', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.3,
		x: lanePositions[i],
		y: 2732 * 0.8
	});
	game.addChild(lane);
}
// Create character
var sonic = game.addChild(new SonicCharacter());
sonic.x = lanePositions[1];
sonic.y = 2732 * 0.7;
sonic.baseY = sonic.y;
// Create UI
var scoreText = new Text2('Rings: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
var distanceText = new Text2('Distance: 0m', {
	size: 60,
	fill: 0xFFFFFF
});
distanceText.anchor.set(0, 0);
distanceText.x = 50;
distanceText.y = 50;
LK.gui.topLeft.addChild(distanceText);
// Touch controls
var touchStartX = 0;
var touchStartY = 0;
var minSwipeDistance = 50;
game.down = function (x, y, obj) {
	touchStartX = x;
	touchStartY = y;
};
game.up = function (x, y, obj) {
	var deltaX = x - touchStartX;
	var deltaY = y - touchStartY;
	if (Math.abs(deltaX) > Math.abs(deltaY)) {
		// Horizontal swipe
		if (Math.abs(deltaX) > minSwipeDistance) {
			if (deltaX > 0) {
				// Swipe right
				sonic.moveTo(sonic.currentLane + 1);
			} else {
				// Swipe left
				sonic.moveTo(sonic.currentLane - 1);
			}
		}
	} else {
		// Vertical swipe
		if (Math.abs(deltaY) > minSwipeDistance) {
			if (deltaY < 0) {
				// Swipe up - jump
				sonic.jump();
			} else {
				// Swipe down - slide
				sonic.slide();
			}
		}
	}
};
function spawnObstacle() {
	var obstacleTypes = ['spike', 'cube', 'barrier'];
	var type = obstacleTypes[Math.floor(Math.random() * obstacleTypes.length)];
	var lane = Math.floor(Math.random() * 3);
	var obstacle = new Obstacle(type);
	obstacle.x = lanePositions[lane];
	obstacle.y = -100;
	obstacle.speed = gameSpeed;
	obstacles.push(obstacle);
	game.addChild(obstacle);
}
function spawnRing() {
	var lane = Math.floor(Math.random() * 3);
	var ring = new Ring();
	ring.x = lanePositions[lane];
	ring.y = -100;
	ring.speed = gameSpeed;
	rings.push(ring);
	game.addChild(ring);
}
function spawnPowerup() {
	var lane = Math.floor(Math.random() * 3);
	var powerup = new PowerUp();
	powerup.x = lanePositions[lane];
	powerup.y = -100;
	powerup.speed = gameSpeed;
	powerups.push(powerup);
	game.addChild(powerup);
}
function checkCollisions() {
	// Check ring collection
	for (var i = rings.length - 1; i >= 0; i--) {
		var ring = rings[i];
		if (!ring.collected && ring.intersects(sonic)) {
			ring.collected = true;
			ringCount++;
			LK.setScore(ringCount);
			scoreText.setText('Rings: ' + ringCount);
			LK.getSound('collect').play();
			// Visual effect
			tween(ring, {
				alpha: 0,
				scaleX: 2,
				scaleY: 2
			}, {
				duration: 300,
				onFinish: function onFinish() {
					ring.destroy();
				}
			});
			rings.splice(i, 1);
		}
	}
	// Check power-up collection
	for (var i = powerups.length - 1; i >= 0; i--) {
		var powerup = powerups[i];
		if (!powerup.collected && powerup.intersects(sonic)) {
			powerup.collected = true;
			sonic.activateInvincibility();
			LK.getSound('powerup').play();
			// Visual effect
			tween(powerup, {
				alpha: 0,
				scaleX: 3,
				scaleY: 3
			}, {
				duration: 400,
				onFinish: function onFinish() {
					powerup.destroy();
				}
			});
			powerups.splice(i, 1);
		}
	}
	// Check obstacle collisions
	for (var i = 0; i < obstacles.length; i++) {
		var obstacle = obstacles[i];
		if (obstacle.intersects(sonic)) {
			// Check if player can avoid obstacle
			var canAvoid = false;
			if (obstacle.type === 'spike' && sonic.isJumping) {
				canAvoid = true;
			} else if (obstacle.type === 'barrier' && sonic.isSliding) {
				canAvoid = true;
			} else if (obstacle.type === 'cube' && (sonic.isJumping || sonic.isSliding)) {
				canAvoid = true;
			}
			if (!canAvoid && !sonic.isInvincible) {
				// Game over
				LK.effects.flashScreen(0xFF0000, 1000);
				LK.showGameOver();
				return;
			}
		}
	}
}
function updateGameObjects() {
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		obstacle.speed = gameSpeed;
		if (obstacle.y > 2732 + 100) {
			obstacle.destroy();
			obstacles.splice(i, 1);
		}
	}
	// Update rings
	for (var i = rings.length - 1; i >= 0; i--) {
		var ring = rings[i];
		ring.speed = gameSpeed;
		if (ring.y > 2732 + 100) {
			ring.destroy();
			rings.splice(i, 1);
		}
	}
	// Update power-ups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var powerup = powerups[i];
		powerup.speed = gameSpeed;
		if (powerup.y > 2732 + 100) {
			powerup.destroy();
			powerups.splice(i, 1);
		}
	}
	// Increase game speed gradually
	gameSpeed += speedIncrement;
	// Update distance
	gameDistance += gameSpeed * 0.1;
	distanceText.setText('Distance: ' + Math.floor(gameDistance) + 'm');
}
// Start background music
LK.playMusic('bgmusic');
game.update = function () {
	// Spawn obstacles
	if (LK.ticks - lastObstacleSpawn > 120 - Math.min(gameSpeed * 2, 60)) {
		spawnObstacle();
		lastObstacleSpawn = LK.ticks;
	}
	// Spawn rings
	if (LK.ticks - lastRingSpawn > 80) {
		if (Math.random() < 0.7) {
			spawnRing();
		}
		lastRingSpawn = LK.ticks;
	}
	// Spawn power-ups (less frequent than rings)
	if (LK.ticks - lastPowerupSpawn > 600) {
		// Every 10 seconds
		if (Math.random() < 0.3) {
			// 30% chance
			spawnPowerup();
		}
		lastPowerupSpawn = LK.ticks;
	}
	checkCollisions();
	updateGameObjects();
};

===================================================================
--- original.js
+++ change.js
@@ -19,8 +19,25 @@
 		self.y += self.speed;
 	};
 	return self;
 });
+var PowerUp = Container.expand(function () {
+	var self = Container.call(this);
+	var powerupGraphics = self.attachAsset('powerup', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = gameSpeed;
+	self.collected = false;
+	self.update = function () {
+		self.y += self.speed;
+		// Pulsing effect to make it stand out
+		powerupGraphics.scaleX = 1 + Math.sin(LK.ticks * 0.1) * 0.2;
+		powerupGraphics.scaleY = 1 + Math.sin(LK.ticks * 0.1) * 0.2;
+		powerupGraphics.rotation += 0.05;
+	};
+	return self;
+});
 var Ring = Container.expand(function () {
 	var self = Container.call(this);
 	var ringGraphics = self.attachAsset('ring', {
 		anchorX: 0.5,
@@ -44,8 +61,64 @@
 	self.isJumping = false;
 	self.isSliding = false;
 	self.jumpStartY = 0;
 	self.baseY = 0;
+	self.isInvincible = false;
+	self.invincibilityTimer = 0;
+	self.activateInvincibility = function () {
+		self.isInvincible = true;
+		self.invincibilityTimer = LK.ticks + 300; // 5 seconds at 60fps
+		// Visual effect - golden tint
+		tween(characterGraphics, {
+			tint: 0xFFD700
+		}, {
+			duration: 200
+		});
+		// Pulsing effect during invincibility
+		self.invincibilityPulse();
+	};
+	self.invincibilityPulse = function () {
+		if (self.isInvincible) {
+			tween(characterGraphics, {
+				alpha: 0.5
+			}, {
+				duration: 250,
+				easing: tween.easeInOut,
+				onFinish: function onFinish() {
+					if (self.isInvincible) {
+						tween(characterGraphics, {
+							alpha: 1
+						}, {
+							duration: 250,
+							easing: tween.easeInOut,
+							onFinish: function onFinish() {
+								self.invincibilityPulse();
+							}
+						});
+					}
+				}
+			});
+		}
+	};
+	self.deactivateInvincibility = function () {
+		self.isInvincible = false;
+		// Remove visual effects
+		tween.stop(characterGraphics, {
+			alpha: true
+		});
+		tween(characterGraphics, {
+			tint: 0xFFFFFF,
+			alpha: 1
+		}, {
+			duration: 200
+		});
+	};
+	self.update = function () {
+		// Check if invincibility should end
+		if (self.isInvincible && LK.ticks >= self.invincibilityTimer) {
+			self.deactivateInvincibility();
+		}
+	};
 	self.moveTo = function (lane) {
 		if (lane < 0 || lane > 2) return;
 		self.currentLane = lane;
 		var targetX = lanePositions[lane];
@@ -107,10 +180,12 @@
 var speedIncrement = 0.02;
 var lanePositions = [2048 * 0.25, 2048 * 0.5, 2048 * 0.75];
 var obstacles = [];
 var rings = [];
+var powerups = [];
 var lastObstacleSpawn = 0;
 var lastRingSpawn = 0;
+var lastPowerupSpawn = 0;
 var ringCount = 0;
 var gameDistance = 0;
 // Create lanes visual
 for (var i = 0; i < 3; i++) {
@@ -197,8 +272,17 @@
 	ring.speed = gameSpeed;
 	rings.push(ring);
 	game.addChild(ring);
 }
+function spawnPowerup() {
+	var lane = Math.floor(Math.random() * 3);
+	var powerup = new PowerUp();
+	powerup.x = lanePositions[lane];
+	powerup.y = -100;
+	powerup.speed = gameSpeed;
+	powerups.push(powerup);
+	game.addChild(powerup);
+}
 function checkCollisions() {
 	// Check ring collection
 	for (var i = rings.length - 1; i >= 0; i--) {
 		var ring = rings[i];
@@ -221,8 +305,29 @@
 			});
 			rings.splice(i, 1);
 		}
 	}
+	// Check power-up collection
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var powerup = powerups[i];
+		if (!powerup.collected && powerup.intersects(sonic)) {
+			powerup.collected = true;
+			sonic.activateInvincibility();
+			LK.getSound('powerup').play();
+			// Visual effect
+			tween(powerup, {
+				alpha: 0,
+				scaleX: 3,
+				scaleY: 3
+			}, {
+				duration: 400,
+				onFinish: function onFinish() {
+					powerup.destroy();
+				}
+			});
+			powerups.splice(i, 1);
+		}
+	}
 	// Check obstacle collisions
 	for (var i = 0; i < obstacles.length; i++) {
 		var obstacle = obstacles[i];
 		if (obstacle.intersects(sonic)) {
@@ -234,9 +339,9 @@
 				canAvoid = true;
 			} else if (obstacle.type === 'cube' && (sonic.isJumping || sonic.isSliding)) {
 				canAvoid = true;
 			}
-			if (!canAvoid) {
+			if (!canAvoid && !sonic.isInvincible) {
 				// Game over
 				LK.effects.flashScreen(0xFF0000, 1000);
 				LK.showGameOver();
 				return;
@@ -262,8 +367,17 @@
 			ring.destroy();
 			rings.splice(i, 1);
 		}
 	}
+	// Update power-ups
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var powerup = powerups[i];
+		powerup.speed = gameSpeed;
+		if (powerup.y > 2732 + 100) {
+			powerup.destroy();
+			powerups.splice(i, 1);
+		}
+	}
 	// Increase game speed gradually
 	gameSpeed += speedIncrement;
 	// Update distance
 	gameDistance += gameSpeed * 0.1;
@@ -283,7 +397,16 @@
 			spawnRing();
 		}
 		lastRingSpawn = LK.ticks;
 	}
+	// Spawn power-ups (less frequent than rings)
+	if (LK.ticks - lastPowerupSpawn > 600) {
+		// Every 10 seconds
+		if (Math.random() < 0.3) {
+			// 30% chance
+			spawnPowerup();
+		}
+		lastPowerupSpawn = LK.ticks;
+	}
 	checkCollisions();
 	updateGameObjects();
 };
\ No newline at end of file