PlayStation 2 :: Metal Slug 3D Cheat Codes
Completion bonusesSuccessfully complete Story mode with Marco to unlock the Monolith with infinite ammunition and the Extras menu (with "Mini Game", "Color Edit", "BGM Test", and "Movies" options).
Laboratory staff
Collect the CDs hidden in the various locations in all missions. Then, enter the "Garage" screen and select "Laboratory". The staff will be found inside.
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