All Levels
At main menu type Triangle, Square, O, Triangle, Square, Up, Left, Right.
Submitted by Battle_X. 

Full Shield and Attack
At the main menu, press Triangle, Square, Triangle, Square, Square, Up, Up, Up.
Submitted by Battle_X. 

Invincibility
At the main menu, press Up, Up, Up, O, Square, Up, Right, Left.
Submitted by Battle_X. 

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