Duke Nukem 3D is a 1998 Sega Mega Drive game by Tec Toy based on the popular PC game of the same name. It was only released in Brazil. A future re-release to a primary American audience was announce by Piko Interactive in 2015. The earlier Sega Saturn version was a port of the PC game; Tec Toy's version contains graphics and sound effects from the PC version, but has substantially different gameplay mechanics, levels, and a simplified game engine.
It is widely speculated to be an extensive hack of Zero Tolerance, but this remains unconfirmed. The legal status of the remake is disputed; 3D Realms claims that it is not legal while Tec Toy claims that they obtained a license from publisher GT Interactive (now defunct).
The game solely contains the second of the original games three episodes. This episode is called Lunar Apocalypse but the levels are redesigned to better suit the new game engine.