===================================================================
--- original.js
+++ change.js
@@ -41,36 +41,24 @@
 		var endColor = 0xff0000;
 		var currentColor = interpolateColor(startColor, endColor, progress);
 		bulletGraphics.tint = currentColor;
 		if (self.y + bulletGraphics.height / 2 > 2732) {
-			if (self.speedY > 0) {
-				self.destroy();
-				return;
-			}
+			self.y = 2732 - bulletGraphics.height / 2;
 			self.speedY = -self.speedY;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.y - bulletGraphics.height / 2 < 0) {
-			if (self.speedY < 0) {
-				self.destroy();
-				return;
-			}
+			self.y = bulletGraphics.height / 2;
 			self.speedY = -self.speedY;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.x + bulletGraphics.width / 2 > 2048) {
-			if (self.speedX > 0) {
-				self.destroy();
-				return;
-			}
+			self.x = 2048 - bulletGraphics.width / 2;
 			self.speedX = -self.speedX;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.x - bulletGraphics.width / 2 < 0) {
-			if (self.speedX < 0) {
-				self.destroy();
-				return;
-			}
+			self.x = bulletGraphics.width / 2;
 			self.speedX = -self.speedX;
 			LK.getSound('bulletWallCollision').play();
 		}
 	};
@@ -87,20 +75,24 @@
 	self.update = function () {
 		self.x += self.speedX * self.speed;
 		self.y += self.speedY * self.speed;
 		if (self.y + pelletGraphics.height / 2 > 2732) {
+			self.y = 2732 - pelletGraphics.height / 2;
 			self.speedY = -self.speedY;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.y - pelletGraphics.height / 2 < 0) {
+			self.y = pelletGraphics.height / 2;
 			self.speedY = -self.speedY;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.x + pelletGraphics.width / 2 > 2048) {
+			self.x = 2048 - pelletGraphics.width / 2;
 			self.speedX = -self.speedX;
 			LK.getSound('bulletWallCollision').play();
 		}
 		if (self.x - pelletGraphics.width / 2 < 0) {
+			self.x = pelletGraphics.width / 2;
 			self.speedX = -self.speedX;
 			LK.getSound('bulletWallCollision').play();
 		}
 	};