The surging popularity of FPS games, such as Doom, and the appearance of other Doom clones for the Amiga, such as Gloom, resulted in Team17 developing Alien Breed 3D. Team17's aim was to not only meet but exceed the capabilities of Doom's engine. AB3D is capable of maps of varying depths with platforms and floors above others, something the Doom engine was not capable of. The graphics, although rendered at 2x2 pixel depth in small window, were considered excellent for the Amiga 1200/Amiga CD32. Team17 made the source code for AB3D freely available in March 1997.