It's never simple with 3D Realms. The Duke Nukem creator is current being sued by Gearbox Software, who bought the musclebound chucklehead's IP as it finished Duke Nukem Forever, over supposedly trying to make a new Duke game with Rise of the Triad remaker Interceptor Entertainment. 3DR simply has no right to, Gearbox says. But oh, another wrinkle. 3D Realms has now been bought by an investment firm which part-owns Interceptor.