At the 'Press Start' screen with Sin Tzu and Batman, hold down L1+L2+R1+R2 and enter the following combinations:
Effect Code All characters at 100% Up, Up, Left, Left, Right, Right, Down, Down Infinite Combo Bar Left, Right, Up, Down, Right, Left, Down, Up Infinite Health Up, Right, Down, Left, Up, Left, Down, Right Unlock Dark Knight difficulty level Down, Left, Right, Up, Up, Right, Left, Down Unlock Everything Down, Up, Down, Up, Left, Right, Left, Right
After unlocking, press L1 to toggle costumes.
Unlockable How to Unlock Classic Costumes for all four characters Beat the game on any difficulty level.
Unlockable How to Unlock Dark Knight Difficulty Level Beat the game on Hard Making of Sin Tzu Video Beat the game on Normal or harder
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You can submit a problem report for any non-working or fake code in the lists above.