Invasion From Beyond Cheats for Playstation

Press L1, R1, L2, R2, Up, Down, Right, Left(2), Right, Down, Up at the "Press Start" screen.

Press L1, R1, L2, R2, Triangle, X, Circle, Square(2), Circle, X, Triangle at the "Press Start" screen. Return to the "Start Mission" screen to select any level in the game.