If you've ever heard of or played pong, then you probably know how this works. Choose your difficulty, then use up and down arrow keys or W and S to move your paddle up and down. The difficulty will change how fast the ball and bot will move. First to five wins. There is a bug where the difficulty will be different from the one you selected on the second time playing the game. If you know how to fix it, that would be great. :)
