This seminal 1993 Main Game is a foundational first-person shooter where you play a marine trapped on Mars after UAC teleportation experiments unleash demonic hordes. The core gameplay loop demands relentless, fast-paced movement and aggressive combat as you scavenge weapons to fight through infested industrial complexes. Its distinctive features include intense resource management and level design that encourages exploration for keycards amidst overwhelming enemy encounters, setting the stage for the genre.
This seminal title, first released in 1993, is a foundational entry in the first-person shooter genre. Players assume the role of an unnamed space marine, a hardened veteran stationed on Mars after being disciplined for insubordination. The core conflict ignites when the Union Aerospace Corporation (UAC), conducting secret interdimensional teleportation research on nearby moons, inadvertently opens gateways to Hell.
The premise places the player as the sole survivor after a military investigation team is overwhelmed by demonic entities pouring through the portals on Phobos. Unable to evacuate, the only path to survival involves fighting through the infested UAC facilities and confronting the resulting otherworldly invasion.
The gameplay loop is characterized by fast-paced, relentless action requiring constant movement and aggressive engagement. Players navigate complex, interconnected levels—shifting between industrial UAC architecture and nightmarish demonic landscapes—while managing limited resources such as ammunition and health.
The primary mechanic involves utilizing an expanding arsenal, starting with a basic sidearm and progressing to powerful firearms like shotguns and chainguns, to dispatch overwhelming hordes of enemies, including imps, spectres, and zombified former comrades. Success hinges on quick reflexes and superior map traversal to outmaneuver threats.
Level design heavily emphasizes exploration, requiring players to locate specific keycards to unlock subsequent areas. Discovering hidden caches of weapons and health upgrades is often necessary to survive encounters with the escalating demonic forces.
The defining characteristic is the emphasis on pure, aggressive combat divorced from modern cover mechanics. The game demands continuous forward momentum and precise aiming against numerous, varied enemy types simultaneously.
This entry represents the main game release. It was originally developed for platforms including DOS and PC-9800 Series, with subsequent availability on systems such as Linux and Windows Mobile.
The narrative establishes an immediate crisis: after securing the perimeter of a compromised research base, the player is cut off and forced inward. The objective shifts from perimeter defense to a desperate fight through the complex to find an exit, directly confronting the fallout of failed dimensional science.
The content of this game is suitable for persons aged 16 years and over only. It contains: Realistic looking violence.

Tales from Mars is a collection of 2 maps based on E1M1, a classic Knee Deep in the Dead map and E1M2 with latter leaning more into The Shores of Hell. It's got all the monster types and a couple of traps that will hopefully stress you a bit.

Doom 1 episode replacement with familiar guns and demons modified for more lightweight, fast-paced gameplay, plus a bunch of unique additional features. Built around Bite-Sized Threats, a vanilla-compatible gameplay mod that speeds up the pace of Doom by drastically reducing both monster health and ammo available.

Immerse yourself in Zugnaex. Compatible with DOOM and DOOM II, it blends classic FPS action with a modern user interface and a detailed heads-up display. Enjoy single-player campaigns and free* online multiplayer for epic battles. (* - requires DOOM)

TheMightyInferno ("TMI") is an E3M1 replacement, inspired by Inferno, with nods to all other Ultimate Doom episodes along the way.

Doomer7 is a specialized Doom mod based on Suda51's cult classic Killer7. The project translates the unique visual style and characters of the Smith Syndicate into the classic shooter.

RUST is a 90s and Scythe-inspired project that aims to combine the early wad aesthetics of D!Zone style wads with the modern progression and fast-paced as wads like Scythe.

Forsaken Compound is a limit-removing E1 replacement wad for Doom 1. There's a mix of action/slaughtery gameplay and more simple, atmosphere-oriented parts that require some thinking, overall intended to be more difficult than normal Knee Deep in the Dead-style mapping, as well as more visually distinct and varied than that episode. Texturing is all done from the IWAD with an excellent custom palette by Dir, and some sound replacements from Doom 64 and Doom 3.

27 100% vanilla-compatible maps for Doom I, replacing the three original episodes. Focus is on short, compact maps with a low to moderate difficulty curve; a secondary aim being more consistent visuals within episodes.

A Claymation-like Standalone Game for GZDoom

An anachronistic 90s-style Episode 2 Replacement.

A vanilla-compatible three-episode megaWAD by Jayextee; including some fixes and minor balance tweaks to the maps included from The Becoming.

SIGIL II is the unofficial sixth episode for 1993’s DOOM. SIGIL II requires the registered version of DOOM to run.

Experts Say Playing This Game Can Lead To Prosperity, Good Luck, And Long Life.

Small, but punchy map and could be rough in some places. Takes about 10 mins to complete.

Solve et Coagula is a limit-removing replacement for Doom Episode 2: The Shores of Hell created by Nicolas Monti that was a runner-up for the 2023 Cacowards.

A full Doom I E1 replacement that gimmick the original one BUT also take its own way, the theme stay mainly "Romero Tech" and retake the mains landmarks of the original maps to build another layout around it, but also take soft inspiration of E2. The main goal of this project was to catch a jovial tune for the sake of nostalgia.

A previously unreleased map of SuperCupcakeTactics that plays for E1M1. A little bit of chaos.

You are the last space marine at the Nuke Testing base on the Moon all of your friends are dead and you only have a pistol, so what are you gonna do about it? Waste Labs is a megawad for Doom 1 with 3 episodes.

A somewhat unusual E1 replacement for limit-removing Doom 1.

A mod that replaces 2d characters and props from Doom with fully 3d voxel-based models. For the GZDoom source port.
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