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[[E4M1: Hell Beneath (Doom)#Walkthrough|E4M1: Hell Beneath]] includes the letters "NIИ" in a part of the level, a reference to [[Wikipedia:Nine Inch Nails|Nine Inch Nails]], the American industrial rock band. <ref>http://www.gamers.org/games/quake/quaketalk.txt</ref> Also, id software's next game, [[Quake]], would feature sound and music by the band's frontman, [[Trent Reznor]]. Additionally, ammunition for the nail-gun and super nail-gun –a crate of nails– would be inscribed with "NIИ" on each of its faces.