CheatCodes.com has all the official Mad Stalker 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 Thursday May 23, 2013 for Mad Stalker are shown below.
At the title screen, press Up, Down, Left, Right, X, Circle.
Enable the "All robots in story mode" code, then return to the title screen. Now press Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, X, Circle.
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