Duke Nukem Manhattan Project is a platform game produced by 3D Realms, and published by Ubisoft. Manhattan Project features the humorously chauvinistic action hero Duke Nukem, this time fighting Mech Morphix, a mad scientist who is using a radioactive slime dubbed G.L.O.P.P. Gluon Liquid Omega-Phased Plasma to metamorphosize creatures into deadly monsters in order to take over Manhattan island, New York City. These enemies include metamorphic alligators, giant cockroaches, and even the Pig cops from Duke Nukem 3D. Duke also faces a few enemies who are not mutants, such as Fem-Mechs, lethal whip-wielding gynoids. Levels in the game contain recognizable parts of New York City.