CheatCodes.com has all the official Invasion From Beyond PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Friday May 24, 2013 for Invasion From Beyond are shown below.
At the "Press Start" screen, 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. Then, return to the "Start Mission" screen to select any level in the game.
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