To unlock these costumes use must beat the high score in each Pain Arena.

Code - Effect

Ben Mosley - Get first place in the Ben Mosley Pain Arena
Ken Nara - Get first place in the Ken Nara Pain Arena
Nikki Jameson - Get first place in the Nikki Jameson Pain Arena
Super John - Get first place in the Danny Witwer Pain Arena

Note: Super John is unlocked instead of Danny Witwer since Witwer does not have any combat moves.