Only 4 secret characters in PS2 USA version
When people say that you can get other characters like Aokijii or Enel they're talking about the japanese version. So don't try wasting your time trying to get a new character that does not yet exist in the manga world of the U.S. But here are some of the things that are unlockable.
Story mode: Very hard mode
Voices: all characters
Characters: Mihawk, shanks, chopper, and ms.sunday.
More tricks, tips and cheats for this game are right here - One Piece Grand Battle! cheats
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