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Playstation - K-1 Revenge cheats

Unlock Master Ishi as palyable charater:
Finish the game with any character in single player mode.

Unlock Animal as playable character:
Choose the single player mode aand go to character selection screen,
then highlight Stan The Man, hold L1, and push Start.

Hyperspeed fighting
While playing a CPU vs. CPU match in tournament mode, hold Circle.

Change character color
Highlight a character and push L1 + Circle.

Unlock Sound test
Hold Start and press L1 + L2 + Select + Down at the title screen.