Press left and right arrows to move bar. Try not to let the ball touch the blue. Press S, T, O, and P at the same time to automatically stop the game.
I actually based this off of another remix of pong that I made. Check it out on the project tree. I made the ball move at speed 100 instead of 10. I have made a pong REMIX series so check it out at http://scratch.mit.edu/studios/245119/ .