Infinite cosmic power
At the main menu, quickly press Up, Square(3), Left, Right, Circle. If you entered the code correctly, you will hear a sound.

Hell bonus level
At the main menu, quickly press Right(2), Square, Circle, Left, Up, Down to unlock the Hell bonus level. If you entered the code correctly, you will hear a sound.

Barge arena and Stan Lee Interview #1
At the main menu, quickly press Square, Circle, Square, Down(2), Circle, Up to unlock the Barge arena and Stan Lee Interview #1. If you entered the code correctly, you will hear a sound.