Metal Slug 3D Cheats

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Completion bonuses:
By finishing Story mode as Marco you will unlock the Monolith with unlimited ammunition and the Extras menu (with "Mini Game", "Color Edit", "BGM Test", and "Movies" options).

Laboratory staff:
By collecting the CDs hidden in the various locations in every mission. Now go into the "Garage" screen and pick "Laboratory". The staff will be found inside.

Slug Gunner:
Add the Gunner Core, Gunner Arm, Gunner Cannon, and Gunner Leg to Metal Slug in the Slug Laboratory.