Ben 10 - Protector of Earth - Platform: Nintendo DS

Galactic Enforcer color set:
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Press Up, Right, Down, Left, A, B, Select at the level selection screen.
A sound will confirm correct code entry. Go into any level and you will 
be in the "Galactic Enforcer" color set. Both Ben and all his alien forms 
will be black and white and official "Galactic Enforcers".

Gold Suit:
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On the main screen, insert the following password: A, B, X, Y, L, R, 
Select. Then, select a level as you normally would. This will unlock the 
Gold Suit for your use during the game, though you'll need to re-enter the 
password if you turn the game off and back on later.