Doom II (full title Doom II: Hell on Earth) is a first-person shooter video game, the second title of id Software's Doom franchise. It was originally released for MS-DOS computers in 1994 and Macintosh computers in 1995. 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.
Due to its success and popularity, Doom II was later released for the Game Boy Advance in 2002, and on Xbox Live Arcade in 2010. The release of the original Doom source code has facilitated ports to many other platforms, including the Apple iPhone and several other types of cell phones.
According to David Kushner in Masters of Doom, id Software shipped 600,000 units of Doom II to stores in preparation for its launch. This initial shipment sold out within a month on shelves, despite its being expected to last for three months. The game was the United States' highest-selling computer title of 1994. It placed 10th for 1996, with 322,671 units sold and $12.6 million earned in the region that year alone.
In the United States, Doom II was the third-best-selling computer game between 1993 and 1999, with 1.55 million units sold during that period. Its revenues in that country ultimately reached $80 million, while those in Europe reached $20 million. Of the latter figure, Kushner wrote that "30 percent [...] came from Germany—a country that had banned the game from its shelves."
Images from MobyGames