K1: Revenge

Audio
At the Start screen press and hold: L1, R1, L2, R2, Down, and select.
(Thanks to urorrurrr71@hotmail.com)

Play as Animal
At 1-player mode, highlight 'STAN THE MAN', then press L1 and Start.
(Thanks to urorrurrr71@hotmail.com)

Play as Hidefumi Minatoya
Enter Training, and complete more than a 100 Combos in Combo Training.
(Thanks to urorrurrr71@hotmail.com)

Play as Master Ishii and James Harrison
Beat the one player mode with any character.
(Thanks to urorrurrr71@hotmail.com)