Fencer: Perhaps I have misunderstood  how one can contribute a prize for a Prize Tournament.  My profile shows five Brains. (I would have more to offer, but the 40 Brains I've won in another tournament will not be awarded to me until everyone finishes playing their games, years from now.)  Anyway, can I not use those five Brains as a prize in a tournament that I've created?  Or must I purchase something in order to offer a prize?