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Playstation - Panzer Bandits cheats

Change costume colors
Choose the VS mode, then when selecting a character, 
hold L1, L2, or R2 buttons. 

Unlock Bosses as playable characters:
Enter to the options menu. Select story mode, hold Select, and 
quickly press Up, Down, Right, Left, Square, X, Triangle, Circle
buttons on your controller. Sound will confirm the correct code entry.
Now, you can select the Bosses in story or versus modes.