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.
R2Detox says
12 years running and still a beauty. With the availability of epic mods such as Perfected Doom 3, the original game has so much more capability and potential making it even better than some of today's modern shooters.