The Ultimate Doom - GOG

Genre:Shooter - FPP - Sci-fi
Works on:Windows (XP, Vista, 7, 8, 10)
Languages:Audio and text: English
Modes:Single-player - Multi-player
Released:April 30, 1995
Company:id Software / Bethesda Softworks LLC

Minimum system requirements - Windows: Windows XP/Vista/7/8/10
Processor: 1.8 GHz Processor
Memory: 512MB RAM (1 GB recommended)
Graphics: 3D graphics card compatible with DirectX 7 (compatible with DirectX 9 recommended)
Hard Drive: 2GB HDD
Mouse, Keyboard

about: When you buy this game, The Elder Scrolls: Arena and The Elder Scrolls Chapter II: Daggerfall will be added to your GOG.com account for free!
In the future, humans have left Earth and settled throughout the galaxy. On Mars, the Union Aerospace Corporation has established a radioactive waste facility and allowed the military to conduct teleportation experiments on the nearby moons of Deimos and Phobos. Hours ago, the base on Mars began receiving incoherent distress messages from Phobos, while Deimos has disappeared completely. With all attempts to establish contact failing, you and your team have been dispatched to investigate. Upon arrival, you secure the perimeter as the rest of your team enters the facility. As you stand guard, your radio crackles with the sound of gunfire, cracking bones and blood-curdling screams and eventually falls silent. Alone, with no way off the planet or means to defend yourself other than your trusty pistol, there’s only one way out - into the complex of death and the horrors that await you within. If you plan to get out of here alive you must fend off the hordes of demonic imps, haunting spectres and your undead, former comrades waiting to tear you limb from limb. So, grab the nearest shotgun and blast your way out of this fragging madness!
First released as shareware back in 1994, The Ultimate DOOM is the definitive edition, featuring the 3 initial episodes and the later addition, “Thy Flesh consumed”. Doom is one of the most defining and influential games of the First Person Shooter genre, spawning copy-cats, sequels, a film and is also credited with popularising both multiplayer and modding. To this day, the game has a thriving community, with new mods being created and multiplayer events still in action on a daily basis. With blood-drenched action, a rocking soundtrack and hours of replayability, this fragging awesome game is a must-play for any fans of the FPS genre. Dim the lights, turn up the volume and prepare for the time of your death!

5 difficulties!
36 missions spread across 4 episodes: Knee-deep in the Dead, The Shores of Hell, Inferno and Thy Flesh Consumed.
7 weapons, including the pistol, shotgun, and the BFG 9000.
A blood-drenched, adrenaline-fuelled FPS experience like no other.

https://www.gog.com/game/the_ultimate_doom