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

/**** 
* Classes
****/ 
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.collected = false;
	self.update = function () {
		self.y += self.speed;
		self.rotation += 0.1;
	};
	return self;
});
var Rock = Container.expand(function () {
	var self = Container.call(this);
	var rockGraphics = self.attachAsset('rock', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Shark = Container.expand(function () {
	var self = Container.call(this);
	var sharkGraphics = self.attachAsset('shark', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.horizontalSpeed = 2;
	self.direction = Math.random() > 0.5 ? 1 : -1;
	self.attacking = false;
	self.lastSurferDistance = 1000;
	self.update = function () {
		self.y += self.speed;
		// Horizontal movement
		self.x += self.horizontalSpeed * self.direction;
		// Bounce off screen edges
		if (self.x < 100) {
			self.direction = 1;
		} else if (self.x > 1948) {
			self.direction = -1;
		}
		// Check distance to surfer for attack behavior
		if (surfer) {
			var currentDistance = Math.abs(self.x - surfer.x) + Math.abs(self.y - surfer.y);
			// Attack when getting closer to surfer
			if (currentDistance < 200 && !self.attacking) {
				self.attacking = true;
				// Speed up towards surfer
				self.speed = 6;
				self.horizontalSpeed = 4;
				// Move towards surfer horizontally
				if (surfer.x > self.x) {
					self.direction = 1;
				} else {
					self.direction = -1;
				}
				// Play attack sound
				LK.getSound('shark_attack').play();
				// Flash red to indicate danger
				LK.effects.flashObject(self, 0xff0000, 500);
			}
			self.lastSurferDistance = currentDistance;
		}
	};
	return self;
});
var Surfer = Container.expand(function () {
	var self = Container.call(this);
	var surferGraphics = self.attachAsset('surfer', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.targetX = 2048 / 2;
	self.moveSpeed = 8;
	self.update = function () {
		var dx = self.targetX - self.x;
		if (Math.abs(dx) > 2) {
			self.x += dx * 0.15;
		}
		;
		self.rotation = dx * 0.002;
	};
	return self;
});
var Wave = Container.expand(function () {
	var self = Container.call(this);
	var waveGraphics = self.attachAsset('wave', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0066cc
});

/**** 
* Game Code
****/ 
var surfer;
var waves = [];
var rocks = [];
var powerups = [];
var sharks = [];
var distance = 0;
var gameSpeed = 4;
var isDragging = false;
var lastWaveSpawn = 0;
var lastRockSpawn = 0;
var lastPowerUpSpawn = 0;
var lastSharkSpawn = 0;
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: '#ffffff'
});
scoreText.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreText);
scoreText.x = 120; // Offset from top-left to avoid menu icon
var distanceText = new Text2('Distance: 0', {
	size: 50,
	fill: '#ffffff'
});
distanceText.anchor.set(0.5, 0);
LK.gui.top.addChild(distanceText);
// Create surfer
surfer = game.addChild(new Surfer());
surfer.x = 2048 / 2;
surfer.y = 2200;
// Spawn functions
function spawnWave() {
	var wave = new Wave();
	wave.x = Math.random() * 1800 + 124;
	wave.y = -100;
	waves.push(wave);
	game.addChild(wave);
}
function spawnRock() {
	var rock = new Rock();
	rock.x = Math.random() * 1800 + 124;
	rock.y = -100;
	rocks.push(rock);
	game.addChild(rock);
}
function spawnPowerUp() {
	var powerup = new PowerUp();
	powerup.x = Math.random() * 1800 + 124;
	powerup.y = -100;
	powerups.push(powerup);
	game.addChild(powerup);
}
function spawnShark() {
	var shark = new Shark();
	shark.x = Math.random() * 1600 + 224;
	shark.y = -150;
	sharks.push(shark);
	game.addChild(shark);
}
// Input handling
game.down = function (x, y, obj) {
	isDragging = true;
	surfer.targetX = x;
};
game.move = function (x, y, obj) {
	if (isDragging) {
		surfer.targetX = Math.max(100, Math.min(1948, x));
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
// Main game loop
game.update = function () {
	distance += gameSpeed;
	// Increase difficulty over time
	if (LK.ticks % 600 === 0) {
		gameSpeed += 0.2;
	}
	// Spawn waves
	if (LK.ticks - lastWaveSpawn > 90 - gameSpeed * 2) {
		spawnWave();
		lastWaveSpawn = LK.ticks;
	}
	// Spawn rocks
	if (LK.ticks - lastRockSpawn > 180 - gameSpeed * 3) {
		spawnRock();
		lastRockSpawn = LK.ticks;
	}
	// Spawn power-ups
	if (LK.ticks - lastPowerUpSpawn > 300) {
		spawnPowerUp();
		lastPowerUpSpawn = LK.ticks;
	}
	// Spawn sharks
	if (LK.ticks - lastSharkSpawn > 450 - gameSpeed * 2) {
		spawnShark();
		lastSharkSpawn = LK.ticks;
	}
	// Update waves
	for (var i = waves.length - 1; i >= 0; i--) {
		var wave = waves[i];
		wave.speed = gameSpeed;
		if (wave.y > 2832) {
			wave.destroy();
			waves.splice(i, 1);
		}
	}
	// Update and check collisions for rocks
	for (var j = rocks.length - 1; j >= 0; j--) {
		var rock = rocks[j];
		rock.speed = gameSpeed;
		if (rock.y > 2832) {
			rock.destroy();
			rocks.splice(j, 1);
			continue;
		}
		// Collision with surfer
		if (surfer.intersects(rock)) {
			LK.getSound('crash').play();
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
	}
	// Update and check collisions for power-ups
	for (var k = powerups.length - 1; k >= 0; k--) {
		var powerup = powerups[k];
		powerup.speed = gameSpeed;
		if (powerup.y > 2832) {
			powerup.destroy();
			powerups.splice(k, 1);
			continue;
		}
		// Collection by surfer
		if (!powerup.collected && surfer.intersects(powerup)) {
			powerup.collected = true;
			LK.setScore(LK.getScore() + 50);
			LK.getSound('collect').play();
			// Fade out effect
			tween(powerup, {
				alpha: 0,
				scaleX: 2,
				scaleY: 2
			}, {
				duration: 300,
				onFinish: function onFinish() {
					powerup.destroy();
				}
			});
			powerups.splice(k, 1);
		}
	}
	// Update and check collisions for sharks
	for (var s = sharks.length - 1; s >= 0; s--) {
		var shark = sharks[s];
		shark.speed = Math.max(shark.speed, gameSpeed);
		if (shark.y > 2832) {
			shark.destroy();
			sharks.splice(s, 1);
			continue;
		}
		// Collision with surfer
		if (surfer.intersects(shark)) {
			LK.getSound('crash').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Update score based on distance
	if (LK.ticks % 10 === 0) {
		LK.setScore(LK.getScore() + 1);
	}
	// Update UI
	scoreText.setText('Score: ' + LK.getScore());
	distanceText.setText('Distance: ' + Math.floor(distance / 10) + 'm');
};

===================================================================
--- original.js
+++ change.js
@@ -31,8 +31,54 @@
 		self.y += self.speed;
 	};
 	return self;
 });
+var Shark = Container.expand(function () {
+	var self = Container.call(this);
+	var sharkGraphics = self.attachAsset('shark', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 3;
+	self.horizontalSpeed = 2;
+	self.direction = Math.random() > 0.5 ? 1 : -1;
+	self.attacking = false;
+	self.lastSurferDistance = 1000;
+	self.update = function () {
+		self.y += self.speed;
+		// Horizontal movement
+		self.x += self.horizontalSpeed * self.direction;
+		// Bounce off screen edges
+		if (self.x < 100) {
+			self.direction = 1;
+		} else if (self.x > 1948) {
+			self.direction = -1;
+		}
+		// Check distance to surfer for attack behavior
+		if (surfer) {
+			var currentDistance = Math.abs(self.x - surfer.x) + Math.abs(self.y - surfer.y);
+			// Attack when getting closer to surfer
+			if (currentDistance < 200 && !self.attacking) {
+				self.attacking = true;
+				// Speed up towards surfer
+				self.speed = 6;
+				self.horizontalSpeed = 4;
+				// Move towards surfer horizontally
+				if (surfer.x > self.x) {
+					self.direction = 1;
+				} else {
+					self.direction = -1;
+				}
+				// Play attack sound
+				LK.getSound('shark_attack').play();
+				// Flash red to indicate danger
+				LK.effects.flashObject(self, 0xff0000, 500);
+			}
+			self.lastSurferDistance = currentDistance;
+		}
+	};
+	return self;
+});
 var Surfer = Container.expand(function () {
 	var self = Container.call(this);
 	var surferGraphics = self.attachAsset('surfer', {
 		anchorX: 0.5,
@@ -44,9 +90,9 @@
 		var dx = self.targetX - self.x;
 		if (Math.abs(dx) > 2) {
 			self.x += dx * 0.15;
 		}
-		// Add slight rotation based on movement
+		;
 		self.rotation = dx * 0.002;
 	};
 	return self;
 });
@@ -76,14 +122,16 @@
 var surfer;
 var waves = [];
 var rocks = [];
 var powerups = [];
+var sharks = [];
 var distance = 0;
 var gameSpeed = 4;
 var isDragging = false;
 var lastWaveSpawn = 0;
 var lastRockSpawn = 0;
 var lastPowerUpSpawn = 0;
+var lastSharkSpawn = 0;
 // UI Elements
 var scoreText = new Text2('Score: 0', {
 	size: 60,
 	fill: '#ffffff'
@@ -122,8 +170,15 @@
 	powerup.y = -100;
 	powerups.push(powerup);
 	game.addChild(powerup);
 }
+function spawnShark() {
+	var shark = new Shark();
+	shark.x = Math.random() * 1600 + 224;
+	shark.y = -150;
+	sharks.push(shark);
+	game.addChild(shark);
+}
 // Input handling
 game.down = function (x, y, obj) {
 	isDragging = true;
 	surfer.targetX = x;
@@ -157,8 +212,13 @@
 	if (LK.ticks - lastPowerUpSpawn > 300) {
 		spawnPowerUp();
 		lastPowerUpSpawn = LK.ticks;
 	}
+	// Spawn sharks
+	if (LK.ticks - lastSharkSpawn > 450 - gameSpeed * 2) {
+		spawnShark();
+		lastSharkSpawn = LK.ticks;
+	}
 	// Update waves
 	for (var i = waves.length - 1; i >= 0; i--) {
 		var wave = waves[i];
 		wave.speed = gameSpeed;
@@ -211,8 +271,25 @@
 			});
 			powerups.splice(k, 1);
 		}
 	}
+	// Update and check collisions for sharks
+	for (var s = sharks.length - 1; s >= 0; s--) {
+		var shark = sharks[s];
+		shark.speed = Math.max(shark.speed, gameSpeed);
+		if (shark.y > 2832) {
+			shark.destroy();
+			sharks.splice(s, 1);
+			continue;
+		}
+		// Collision with surfer
+		if (surfer.intersects(shark)) {
+			LK.getSound('crash').play();
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+			return;
+		}
+	}
 	// Update score based on distance
 	if (LK.ticks % 10 === 0) {
 		LK.setScore(LK.getScore() + 1);
 	}