Editing Doom (1993 video game) (section)

===Controversies===
{{See also|List of banned video games by country}}
[[File:Doom gibs.png|thumb|''Doom''{{'s}} intense level of graphic violence, as seen in this gory effect of a rocket hitting a group of demons, made the game highly controversial.<ref name="MOD171"/>|alt=Screen shot of a rocket exploding, causing multiple enemies to burst into bloody chunks]]
''Doom'' was notorious for its high levels of [[graphic violence]] and [[Satanism|satanic]] imagery, which generated controversy from a broad range of groups.<ref name="MOD171"/> ''Doom'' for the 32X was one of the first video games to be given a Mature 17+ rating from the [[Entertainment Software Rating Board]] due to its violent gore and nature, while ''Doom II'' was the first.<ref name="MOD171"/><ref name="DoomMature"/><ref name="DoomViolence"/> In Germany, shortly after its publication, ''Doom'' was classified as "harmful to minors" by the [[Federal Department for Media Harmful to Young Persons]] and could not be sold to children or displayed where they could see it, which was only rescinded in 2011.<ref name="GermanyBan"/>

''Doom'' again sparked controversy in the United States when it was found that [[Eric Harris and Dylan Klebold]], who committed the [[Columbine High School massacre]] on April 20, 1999, were avid players.<ref name="NYTColumbine"/> While planning for the massacre, Harris said in his journal that the killing would be "like playing ''Doom''".<ref name="EscapistColumbine"/> A rumor spread afterward that Harris had designed a custom ''Doom'' level that looked like the high school, populated with representations of Harris's classmates and teachers, which he used to practice for the shooting.<ref name="SnopesHarrisLevels"/> Although Harris did design several custom ''Doom'' levels, which later became known as the "[[Doom modding#Miscellaneous|Harris levels]]", none were based on the school.<ref name="SnopesHarrisLevels"/> ''Doom'' was dubbed a "mass murder simulator" by critic and Killology Research Group founder [[Dave Grossman (author)|David Grossman]].<ref name="DoomKillology"/>

In the earliest release versions, the level E1M4: Command Control contains a [[swastika]]-shaped structure, which was put in as a homage to ''Wolfenstein 3D''. The swastika was removed in later versions, out of respect for a military veteran's request, according to Romero.<ref name="IGNvideo"/>