In Open Style mode, keep fighting until you are
champion to access the Jack-In-The-Box boxer. Defend your championship
title five times to access Snake.
If you select Peek-A-Boo mode and fight until you are champion you can
access Kiki, Mimi, and Roboxer. If you defend the championship title
five times you can access Edward King (the promoter) and Carrie (the
girl that carries the round cards).