Play as Aversa: At the "Mode Select" screen, pick "Match Mode." Then, at the "Player Select" screen, highlight any player and do the following: Press and hold L1, R2, Up, and Square. With these buttons held, press X. The player you highlighted will be selected, but you'll hear a "meow" sound. When the match starts, you'll play as a hidden character named Aversa.

Play as Mattox: At the "Mode Select" screen, pick "Match Mode." Then, at the "Player Select" screen, highlight any player and press L2, L2, R1, R1, R1, Down, Triangle, Triangle, Triangle, Triangle, X. The player you highlighted will be selected, but you'll hear a yell. When the match starts, you'll play as a hidden character named Mattox.