God Mode:
At the title screen, Click Right Thumbstick, Click Left Thumbstick, Right, Left, L, R, Click Right Thumbstick, Click Left Thumbstick, Right, Left, L, R.
Unlimited Ammo:
At the title screen, press Black, R, Y, White, L, Up, Black, R, Y, White, L, Up.
All Missions and Pictures:
At the title screen, press White, Black, L, R, L, White, White, Black, L, R, R, Black.
Add Weapons Option (when paused):
At the title screen, press Up, Down, Left, Right, B, X, Up, Down, Left, Right, B, X.
Acid Trip Mode:
At the title screen, press Up, Black, B, Left, Y, X , White, L, B , R.
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