Play the original episode of Doom, the cult game, released in 1993 (DOS version), which popularized the FPS genre and had a great influence on subsequent shooter games.
Play as a space marine (a doomguy) stationed on the planet Mars.
Army experiments on radioactive waste opened a portal to hell, leading to an invasion of demonic creatures on Phobos (moon of Mars).
Alone against all, fight more and more enemies through 3 episodes of frenzied action.
Space: Open door