You're playing against the computer in a game of pong. But you can win! The computer's paddle glides to the ball, and you can choose the difficulty level. The address is http://scratch.mit.edu/projects/hmnwilson/34795.
I'm taking a break from Scratch until 2.0 comes out. Any messages sent between then and now probably won't be read - sorry. (Oct. 20, 2011)