Use your mouse to move the paddle.
My latest game, Deflect - http://scratch.mit.edu/projects/11790481/ Pong with a twist - a double sided paddle! Hit the balls coming from both directions to keep your score going up! If you miss one, you get a mark. Three marks and you get a strike, and three strikes and you're out. My current highscore is 250, and I got 9 on turbo! :P Good luck!