A massive demonic invasion has overwhelmed the Union Aerospace Corporation's Mars Research Facility, leaving only chaos and horror in its wake. As one of only a few survivors, you must fight your way to hell and back against a horde of evil monsters.
Even after 6 years in the works, there is room for improvements. Endarchy v1.0.1 adds a number of tweaks and game play changes. Endarchy is a Doom 3 single player mission, played over 3 levels and a "Quake style" skill selection intro.
Some of the core changes between the original release and v1.0.1 are: