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* Some skilled players have created new challenges by defining custom rules, such as [[UV pacifist|pacifist]] (not hurting monsters) and [[UV Tyson|Tyson]] (fists, pistol, and chainsaw only).
*In a similar vein to the custom rules, [[Doom (2016)|the 2016 reboot]] added the Ultra-Nighmare difficulty in a free update; while identical to the normal Nightmare difficulty for most purposes, it adds an "Ironman" feature in which the game is only saved after clearing a stage and dying for any reason (with the sole exception of dying during a Rune Trial) will force the player to start the game over from the beginning with a marker to indicate where the player died on the previous attempt.
== See also ==
