Just finished this and I'm dying for people to try it out. It works fine as a solo game, but the most fun is when multiple users are online at once. Anyone viewing can jump in whenever a player misses the ball, which makes it a very lively environment. Please check it out and leave me a comment.

http://mv.ezproxy.com.ezproxyberklee.flo.org/projects/10101428/

To workaround the “lag” involved in cloud variables, I divided the screen into two halves. Your side runs locally (and updates cloud) and the side for your opponent runs off cloud data. I made up the concept of weak video signal from a distant planet to explain the “lagginess”.