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    Playstation 2 : Metal Slug 3D Cheats
    
        Below are the cheats, hints, and tips that Game Gas knows about for Metal Slug 3D. On the right are
        websites that may have additional cheat codes, hints, or tips for Metal Slug 3D. 
        
        
                       
            Completion bonuses:
Successfully complete Story mode as Marco to unlock the Monolith with unlimited 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 every mission. Then, enter the "Garage" screen and select "Laboratory". The staff will be found inside.