Released by id Software in 1995 for DOS, PC, Mac, and iOS, The Ultimate Doom is an expanded edition of the landmark first-person shooter Doom. Players take on the role of a lone marine, the last survivor standing against waves of demonic enemies, fighting through fast-paced, texture-mapped environments across multiple episodes. The release collects the original three episodes of Doom and adds a fourth, Thy Flesh Consumed, which was newly created for this version. Gameplay centers on navigating maze-like levels, collecting weapons and resources, and eliminating large numbers of enemies in combat that emphasizes speed and aggression. The Ultimate Doom represents a definitive packaging of one of the most influential shooters in the medium's history, preserving the core mechanics that helped establish the conventions of the first-person shooter genre.