Enter "MJNKPNPN" as a password. Alternately, unlock all twenty four pictures in gallery mode. Hold Start when selecting a fighter to get a black costume with an unlimited gauge. Hold Triangle when selecting a fighter to get a gold costume.
Enter "3GOU1SAD" as a password to unlock new gallery mode challenge.
Enter "KYUSBNBN" as a password to unlock Dizzy, Testament, and GG mode. Alternately, press Down, Right(2), Up, Start at the title screen. If you entered the code correctly, you will hear a sound.
Unlock eighteen pictures in gallery mode to unlock Justice.
Unlock twelve pictures in gallery mode to unlock Kliff.