- The Game Boy Advance port saw a few changes in order to secure the "T for Teen" rating. .All red blood was recolored green .Corpses disappear after a few seconds .Corpses part of the level design are removed .Zombies and Imps can no longer be gibbed by explosive weapons and barrels
- Shortly before the release of Doom 2, a version was released as "Ultimate Doom" with a fourth episode that led in to Doom 2
- In version 1.4 for the PC, an alteration was present. In Episode 1, Map 4: "Command Control", a structure originally lowers to the ground to create a pattern of a swastika on the floor. This was done as a reference to "Wolfenstein 3D" however, this offended many players so it was changed to a different, yet similar structure in this version. (See links under "photographs")
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