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The Ultimate Doom (or The Ultimate DOOM as a brand, and informally "Ultimate Doom") is an updated version of Doom released on April 30, 1995, that adds a fourth nine-level episode, Thy Flesh Consumed, which contains seven regular levels, one secret level, and one boss level. This enhanced version was made as an incentive in the distribution of the boxed game through retail stores and venues, although to be fair to fans who had previously registered Doom, id Software provided them with a freely available patch to upgrade their copy of Doom version 1.9 to The Ultimate Doom.

Before the expansion's release and before the name The Ultimate Doom was picked, the game was referred to as The Definitive Doom Special Edition. References to the original name can be found in the source code and in the DOS installer of the game, which features the shortened name DOOM: Special Edition on the titlebar and suggests DOOM_SE as the default installation directory.


The Ultimate Doom Central
The Ultimate Doom Wiki[www.doomwiki.org]
The Ultimate Doom Speedrun Demos[www.doomedsda.us]