Talk to Denn if you want to register any further Polymock pieces, then challenge Hoff to a match. This match occurs in any of the the Polymock arenas. If you are defeated, simply speak to Hoff to try again. Once you've defeated him and been returned to Rata Sum, speak to him to claim your reward. Hoff will randomly pick different Polymock pieces each time, but always use them in order from right to left. Combinations known to succeed in beating him: