The Steam download version of the game is listed as running on Windows 2000/XP/Vista because the executables are modified to use a DOSBox variant (v 0.70) additionally the traditional setup.exe is missing. This game took 8 months to make (unlike its predecessor which spent a year in production). Instead, it was completed by Sandy Petersen for this game. MAP10: Refueling Base, was originally started by Tom Hall as a level in the original DOOM, and even appeared as E1M6 in DOOM 0.5, but did not make it to the final game. However, if such levels ever really existed, they have not surfaced on the internet and none of Harris's known levels bear resemblance to real-world architecture. until the day they decided to do it for real. According to the rumor, Harris and his friend Klebold modeled the levels after the school, filled it with enemies meant to represent students and teachers, and played through it again and again.

Soon after the shootings, rumors surfaced that Harris made some levels which bear an uncanny resemblance to Columbine High School. Harris seemed to lose interest in DOOM at the end of 1996. Harris' AOL directory, which was mirrored at, also includes what appears to be a menu image reading ' Quake Files', although no Harris-designed Quake levels have surfaced he seems to have hosted a Quake level designed by another person, and a utility for viewing and altering Quake sprites. Also of note is that the text file for Bricks.wad credits 'My good friend Dylan Klebold for helping me play-test this WAD'. They are short, crude but entertaining, and give no clue as to Harris' later actions. The most polished one is uaclabs.wad, a simple pair of levels. In his AOL profile he listed himself as a 'professional DOOM and DOOM II creator', although all of his WADs appeared to be for DOOM II, mostly deathmatch, and he was not paid for them. He went under the names RebDooMer, Rebldomakr and Rebdomine, and hosted a set of WADs on AOL. The reason was that the shooters, Dylan Klebold and Eric Harris, were both into DOOM and Quake Harris even made some amateur levels for DOOM II. While it's a well-known fact today, it is worth mentioning that after the much-publicized Columbine high-school shooting, DOOM II became a showcase for media finger-pointing and for a collective lawsuit by parents of teenagers killed in the shooting. If you play the boss' sound file backwards, it says 'To win the game, you must beat me, John Romero.' John Romero is one of the developers. An arcade version was however never released and the game seen in the film is a film prop with a PC inside. In the 1997 film Grosse Point Blank a store clerk can be seen playing on a DOOM II arcade cabinet. Doom II: Hell on Earth appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.

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