Okay, thanks. I'm just in the very early design phase on this one. So if anyone has some experience with putting lots of bouncing balls in their game, please let me know what would be a realistic number to have going at one time.

Ideally I'd like every ball in the machine to have a physics action, but that could be thousands. If only the ones that are on the playing board at one time, then proabably less than 50. There would need to be quite a few pins on the board for them to bounce off as well. See illustration: