Saved Game Start at level 8
Invincibility and Level Select
At the main screen hold Left Square L1 L2 R1 R2 until "Cheat Mode" appears at the bottom of your screen. Quickly choose Options and you can enable Invincibility or start on any level.
Triangle Triangle R1 Square Triangle R1 L2 L2 R2 R2
Pause gameplay and press Right Square Triangle Square Triangle X.
Nude Color Scheme
Complete the game under each difficulty setting then win again under Hard and enter the initials NUD.