Big Head, Kid Fighter, and Bonus Modes
Big Head: At the fighter-select screen, press and hold L2, highlight your character, and press Cir. When the fight begins, your character will have a big head.
Kid Fighter: At the fighter-select screen, press and hold R2, highlight your character, and press Cir. When the fight begins, your character will be kid-size.
Bonus Mode Codes
Vitality Recover: Beat the game with Bakuryu on level 4.
Big Arm Type: Beat the game on level 4 with any fighter and without using any continues.
No Gauge Mode: Beat the game with Yugo on any skill level.