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

/**** 
* Classes
****/ 
// Ball class
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballAsset = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = ballAsset.width / 2;
	// Ball velocity
	self.vx = 0;
	self.vy = 0;
	self.speed = 18; // Initial speed
	self.setRandomDirection = function () {
		// Angle between 45 and 135 degrees, randomize left/right
		var angle = (Math.random() * 0.5 + 0.25) * Math.PI; // 45-135 deg
		if (Math.random() < 0.5) angle = Math.PI - angle; // flip left/right
		self.vx = Math.cos(angle) * self.speed;
		self.vy = Math.sin(angle) * self.speed;
	};
	self.setRandomDirection();
	return self;
});
// Enemy Paddle class (AI)
var EnemyPaddle = Container.expand(function () {
	var self = Container.call(this);
	var paddleAsset = self.attachAsset('paddle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = paddleAsset.width;
	self.height = paddleAsset.height;
	self.speed = 32; // AI paddle speed (pixels per frame)
	self.update = function () {
		// Track the ball's x position, but clamp movement speed
		var dx = ball.x - self.x;
		if (Math.abs(dx) > self.speed) {
			self.x += self.speed * (dx > 0 ? 1 : -1);
		} else {
			self.x = ball.x;
		}
		// Clamp within game area
		var halfW = self.width / 2;
		if (self.x < halfW) self.x = halfW;
		if (self.x > GAME_WIDTH - halfW) self.x = GAME_WIDTH - halfW;
	};
	return self;
});
// Hit effect class
var HitEffect = Container.expand(function () {
	var self = Container.call(this);
	var effectAsset = self.attachAsset('hitEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.8
	});
	// Play animation
	self.play = function (x, y, color) {
		self.x = x;
		self.y = y;
		self.alpha = 1;
		self.scale.x = 0.2;
		self.scale.y = 0.2;
		// Set color if provided
		if (color) {
			effectAsset.tint = color;
		} else {
			effectAsset.tint = 0xffffff;
		}
		// Scale up and fade out
		tween(self, {
			alpha: 0,
			scaleX: 1.5,
			scaleY: 1.5
		}, {
			duration: 400,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				self.parent.removeChild(self);
				hitEffects.splice(hitEffects.indexOf(self), 1);
			}
		});
	};
	return self;
});
// No plugins needed for MVP
// Paddle class
var Paddle = Container.expand(function () {
	var self = Container.call(this);
	var paddleAsset = self.attachAsset('paddle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = paddleAsset.width;
	self.height = paddleAsset.height;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Import tween plugin
// Ball: circle
// Paddle: wide, short rectangle
// Game area
// Sound effects
// Music
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var hitEffects = [];
// Function to create hit effect
function createHitEffect(x, y, color) {
	var effect = new HitEffect();
	game.addChild(effect);
	hitEffects.push(effect);
	effect.play(x, y, color);
}
// Play background music (looping)
LK.playMusic('bgmusic');
// Paddle setup
var paddle = new Paddle();
game.addChild(paddle);
paddle.x = GAME_WIDTH / 2;
paddle.y = GAME_HEIGHT - 180; // 180px from bottom
// Enemy paddle setup (AI)
var enemyPaddle = new EnemyPaddle();
game.addChild(enemyPaddle);
enemyPaddle.x = GAME_WIDTH / 2;
enemyPaddle.y = 180; // 180px from top
// Ball setup
var ball = new Ball();
game.addChild(ball);
ball.x = GAME_WIDTH / 2;
ball.y = GAME_HEIGHT / 2;
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Dragging
var dragging = false;
var dragOffsetX = 0;
// Touch/mouse controls
game.down = function (x, y, obj) {
	// Only start drag if touch is on/near paddle
	var dx = x - paddle.x;
	var dy = y - paddle.y;
	if (Math.abs(dx) < paddle.width / 2 + 60 && Math.abs(dy) < paddle.height / 2 + 80) {
		dragging = true;
		dragOffsetX = paddle.x - x;
	}
};
game.move = function (x, y, obj) {
	if (dragging) {
		var newX = x + dragOffsetX;
		// Clamp paddle within game area
		var halfW = paddle.width / 2;
		if (newX < halfW) newX = halfW;
		if (newX > GAME_WIDTH - halfW) newX = GAME_WIDTH - halfW;
		paddle.x = newX;
	}
};
game.up = function (x, y, obj) {
	dragging = false;
};
// Ball-paddle collision helper
function ballHitsPaddle() {
	var paddleTop = paddle.y - paddle.height / 2;
	var paddleLeft = paddle.x - paddle.width / 2;
	var paddleRight = paddle.x + paddle.width / 2;
	var ballBottom = ball.y + ball.radius;
	// Simple collision check for low speeds
	if (ballBottom >= paddleTop && ball.y < paddle.y) {
		if (ball.x >= paddleLeft - ball.radius && ball.x <= paddleRight + ball.radius) {
			return true;
		}
	}
	// Advanced collision detection for high speeds
	// Check if ball will pass through paddle in this frame
	if (ball.vy > 0) {
		// Only check when ball is moving down
		var nextY = ball.y + ball.vy;
		var nextBottom = nextY + ball.radius;
		// If ball will move from above paddle to below paddle in one frame
		if (ball.y < paddleTop && nextBottom > paddle.y) {
			// Calculate x position at the moment of intersection with paddle top
			var t = (paddleTop - ball.y + ball.radius) / ball.vy; // Time of intersection
			var intersectX = ball.x + ball.vx * t;
			// Check if this x position is within paddle width
			if (intersectX >= paddleLeft - ball.radius && intersectX <= paddleRight + ball.radius) {
				return true;
			}
		}
	}
	return false;
}
// Ball-wall collision helper
function ballHitsWall() {
	if (ball.x - ball.radius <= 0) return 'left';
	if (ball.x + ball.radius >= GAME_WIDTH) return 'right';
	if (ball.y - ball.radius <= 0) return 'top';
	if (ball.y + ball.radius >= GAME_HEIGHT) return 'bottom';
	return null;
}
// Game update
game.update = function () {
	// Move ball
	ball.x += ball.vx;
	ball.y += ball.vy;
	// Update enemy paddle AI
	enemyPaddle.update();
	// Wall collisions
	var wall = ballHitsWall();
	if (wall === 'left' || wall === 'right') {
		ball.vx *= -1;
		// Play wall bounce sound
		LK.getSound('wall').play();
		// Create hit effect at collision point
		createHitEffect(ball.x, ball.y, 0x33ccff);
		// Clamp inside
		if (wall === 'left') ball.x = ball.radius;else ball.x = GAME_WIDTH - ball.radius;
	}
	// Enemy paddle collision
	var enemyPaddleBottom = enemyPaddle.y + enemyPaddle.height / 2;
	var enemyPaddleTop = enemyPaddle.y - enemyPaddle.height / 2;
	var enemyPaddleLeft = enemyPaddle.x - enemyPaddle.width / 2;
	var enemyPaddleRight = enemyPaddle.x + enemyPaddle.width / 2;
	var ballTop = ball.y - ball.radius;
	if (ball.vy < 0 && ballTop <= enemyPaddleBottom && ball.y > enemyPaddle.y) {
		// Check if horizontally within enemy paddle
		if (ball.x >= enemyPaddleLeft - ball.radius && ball.x <= enemyPaddleRight + ball.radius) {
			// Bounce down
			ball.y = enemyPaddle.y + enemyPaddle.height / 2 + ball.radius;
			ball.vy *= -1;
			// Play hit sound
			LK.getSound('hit').play();
			// Add some "english" based on where it hit the enemy paddle
			var hitPos = (ball.x - enemyPaddle.x) / (enemyPaddle.width / 2); // -1 (left) to 1 (right)
			ball.vx += hitPos * 6;
			// Clamp vx to avoid too much horizontal speed
			var maxVX = ball.speed * 0.85;
			if (ball.vx > maxVX) ball.vx = maxVX;
			if (ball.vx < -maxVX) ball.vx = -maxVX;
			// Increase speed
			ball.speed += 1.2;
			var angle = Math.atan2(ball.vy, ball.vx);
			ball.vx = Math.cos(angle) * ball.speed;
			ball.vy = Math.sin(angle) * ball.speed;
			// Flash enemy paddle for feedback
			LK.effects.flashObject(enemyPaddle, 0xff00ff, 180);
			// Create hit effect at collision point
			createHitEffect(ball.x, ball.y, 0xff00ff);
		}
	}
	if (wall === 'top') {
		ball.vy *= -1;
		ball.y = ball.radius;
		// Play wall bounce sound
		LK.getSound('wall').play();
		// Create hit effect at top wall collision
		createHitEffect(ball.x, ball.y, 0x33ccff);
	}
	if (wall === 'bottom') {
		// Missed paddle: Game Over
		LK.getSound('miss').play();
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
		return;
	}
	// Paddle collision
	if (ball.vy > 0 && ballHitsPaddle()) {
		// Bounce up
		ball.y = paddle.y - paddle.height / 2 - ball.radius;
		ball.vy *= -1;
		// Play hit sound
		LK.getSound('hit').play();
		// Add some "english" based on where it hit the paddle
		var hitPos = (ball.x - paddle.x) / (paddle.width / 2); // -1 (left) to 1 (right)
		ball.vx += hitPos * 6;
		// Clamp vx to avoid too much horizontal speed
		var maxVX = ball.speed * 0.85;
		if (ball.vx > maxVX) ball.vx = maxVX;
		if (ball.vx < -maxVX) ball.vx = -maxVX;
		// Score
		score += 1;
		scoreTxt.setText(score);
		// Increase speed every 10 points
		if (score % 10 === 0) {
			ball.speed += 3; // Bigger increase since it's less frequent
			var angle = Math.atan2(ball.vy, ball.vx);
			ball.vx = Math.cos(angle) * ball.speed;
			ball.vy = Math.sin(angle) * ball.speed;
		}
		// Flash paddle for feedback
		LK.effects.flashObject(paddle, 0x00ff00, 180);
		// Create hit effect at collision point
		createHitEffect(ball.x, ball.y, 0x00ff00);
	}
};
// Center score text
scoreTxt.setText(score);
scoreTxt.anchor.set(0.5, 0);
// Reset game state on restart
game.on('reset', function () {
	score = 0;
	scoreTxt.setText(score);
	// Reset paddle
	paddle.x = GAME_WIDTH / 2;
	paddle.y = GAME_HEIGHT - 180;
	// Reset ball
	ball.x = GAME_WIDTH / 2;
	ball.y = GAME_HEIGHT / 2;
	ball.speed = 18;
	ball.setRandomDirection();
	dragging = false;
});

===================================================================
--- original.js
+++ change.js
@@ -185,15 +185,31 @@
 	var paddleTop = paddle.y - paddle.height / 2;
 	var paddleLeft = paddle.x - paddle.width / 2;
 	var paddleRight = paddle.x + paddle.width / 2;
 	var ballBottom = ball.y + ball.radius;
-	// Check if ball is at/just above paddle
+	// Simple collision check for low speeds
 	if (ballBottom >= paddleTop && ball.y < paddle.y) {
-		// Check if horizontally within paddle
 		if (ball.x >= paddleLeft - ball.radius && ball.x <= paddleRight + ball.radius) {
 			return true;
 		}
 	}
+	// Advanced collision detection for high speeds
+	// Check if ball will pass through paddle in this frame
+	if (ball.vy > 0) {
+		// Only check when ball is moving down
+		var nextY = ball.y + ball.vy;
+		var nextBottom = nextY + ball.radius;
+		// If ball will move from above paddle to below paddle in one frame
+		if (ball.y < paddleTop && nextBottom > paddle.y) {
+			// Calculate x position at the moment of intersection with paddle top
+			var t = (paddleTop - ball.y + ball.radius) / ball.vy; // Time of intersection
+			var intersectX = ball.x + ball.vx * t;
+			// Check if this x position is within paddle width
+			if (intersectX >= paddleLeft - ball.radius && intersectX <= paddleRight + ball.radius) {
+				return true;
+			}
+		}
+	}
 	return false;
 }
 // Ball-wall collision helper
 function ballHitsWall() {