Sony Playstation Games Solutions - One of
the Largest Games Source for PSone Cheats, PSX Codes, Hints, Tips,
Walkthroughs, FAQs and Games Strategy Guides.
Press L1 + L2 + R1 + R2 at the character
selection screen.
Bonus fighters:
Successfully complete the game, then press L1 + L2 +
R1 + R2 at the character selection screen. Kojiroh, Tanuki Akari, and
Deku Shigen will be selectable.