Woah, sorry I completely missed there was a thread made for my picture. I explained the game I had in mind in this post here.
http://www.chiefdelphi.com/forums/sh...77&postcount=5
After thinking about this more, I thought a cool alternative might be to have a single scale in the center of the field that robots can get on, and have everyone try to weight it down with robots and balls, would be a tipping problem though.