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Playstation 2 - Obscure cheats

New outfits:
For every character that survives to the end a new costume 
will be unlocked for that.

Galleries:
Complete on each difficulty setting for different galleries.

Unlock Hard Mode, Special Mode/New Costumes, Sum41 and Span Music Videos, 
Behind the scenes + Making of videos, two new weapon (baseball bat & laser gun):
Finish the game, after begin another new game in special mode.