Doom II: Hell on Earth is an award winning first-person shooter video game and the second title of id Software's Doom franchise. It was originally released for MS-DOS and Macintosh computers in 1994. Unlike Doom which was initially only available through shareware and mail order, Doom II was a commercial release sold in stores. Master Levels for Doom II, an expansion pack that includes 21 new levels, was released on December 26, 1995 by id Software.