[Tom Line]

You also have to take safety into account.

This will NOT be a hockey game with normal pucks. Flying frisbees were scary enough and resulted in a few injuries. It's unlikely they are going to give us something like a hockey puck because shielding the entire arena would be really, really tough considering how hard robots could fire them. Also, remember that field cleanup has to be quick for fast game turn around. That limits the number of game pieces and type you can have. Super bouncy balls are out - even if it would be a REALLY interesting game to watch.