Single Maps
Mods consisting of one level. If anyone reading knows of other mods that aren't listed here, feel free to @ the writer on Discord.
The star symbols indicate the difficulty of the levels. Levels with no rating either haven't been played by the page author or he simply doesn't remember.
Mods either have a link to the Bethesda website or Nexus if they haven't been already uploaded to the Mod Portal.
(***) indicates mods that existed at one point but the files aren't available anymore.
Difficulty and lenght of the levels are subjective to the page author, depending on the player they might feel more or less difficult/long
Base Campaign
Hell on Earth
Official Master Level by id Software - ★☆☆☆☆ (~15 Minutes)
Apocalypse on Earth by Nayrham - ★★★★☆
Tormented Earth by MicrowavedBunny
Consumed Earth by Bysior21
Back on Earth by Cuzzmotion
Master Level by quan
La Grande Sheitanerie by Payoyo
Exultia
Official Master Level by id Software - ★☆☆☆☆ (~20 Minutes)
Exuden by leix34 & SeaBazT - ★★★☆☆ (~40 Minutes)
Master Level by Beth
Not Exultia by offwine - ★★★★☆ (~50 Minutes)
Master Level by Buttface
Cultist Base
Slaughter Map by klinecars72 - ★★★☆☆ (~35 Minutes)
Master Level by offwine - ★★★★☆ (~70 Minutes)
Doom Hunter Base
Official Master Level by id Software - ★★☆☆☆ (~20 Minutes)
Master Level by Beth
Doom Hunter Based by Zandyball - ★★★☆☆ (~40 Minutes)
Doom Hunter Fortress by TIIKKETMASTER - ⛧⛧⛧⛧⛧ (???)
Slaughter Arena by Buttface
Super Gore Nest
Slaughter Arena by Delta - ★★☆☆☆ (~15 Minutes)
Slaughter Map by nxmxlxss - ★★★★☆ (~25 Minutes)
Slaughter Map Rework by nxmxlxss
Master Level by offwine - ★★★★★ (~70 Minutes)
The Battle Inside by CRISCANCER
Super More Nest by ModMadder
Demon Possession Challenge by ecksdii - ★☆☆☆☆ (~25 Minutes)
Master Level Rework by Buttface
Arc Complex
Master Levels by Beth
CARCH Complex by Zandyball - ★☆☆☆☆/⛧⛧⛧⛧⛧ (???)
Mars Core
Master Level by FaDa - ★☆☆☆☆ (~25 Minutes)
Master Level by Beth - ★★☆☆☆ (~25 Minutes)
Master Level by offwine
Mars Den Core by leix34 and Payoyo - ★★★★☆ (~55 Minutes)
Mars Core Remix by Konvaz
Sentinel Prime
Official Master Level by id Software - ★☆☆☆☆ (~5 Minutes)
Master Level by Kaiser - ★★☆☆☆ (~10 Minutes)
Master Level by offwine - ★★★☆☆ (~30 Minutes)
Taras Nabad
Slaughter Map by Proteh - ★★☆☆☆ (~10 Minutes)
Master Level by Beth
Master Level by offwine - ★★★★★ (~120 Minutes)
Master Level by Saleem - ★★★★☆ (~60 Minutes)
Master Level Rework by Payoyo - ★★★☆☆ (~40 Minutes)
Master Level Tweak by fhqwhgads7
Slaughter Map by klinecars72 - ★★☆☆☆ (~30 Minutes)
(***) Master Level by Korra
Nekravol
Master Level by Beth - ★☆☆☆☆ (~20 Minutes)
Hell Abyss by Bysior21
Nekravol II
Master Level by Beth
Leaky Nekravol by Zandyball - ★★★☆☆ (~20 Minutes)
Master Level by Buttface
Urdak
Corrupted Khan Maykr by omi - ★★★★★ (~10 Minutes)
Master Level by Beth - ★★☆☆☆ (~20 Minutes)
Slaughter Level by Alpha - ★★★☆☆ (~25 Minutes)
Unholy Urdak by idk929
Final Sin
Master Level by offwine - ★★★☆☆ (~35 Minutes)
Master Level by Kaiser - ★★☆☆☆ (~25 Minutes)
The Ancient Gods Part 1
UAC Atlantica Facility
Master Level by Delta - ★★★★★ (~130 Minutes)
Master Level by Konvaz - ★★★☆☆ (~45 Minutes)
CBT Atlantica Facility by idk929 - ⛧⛧⛧⛧⛧ (~90 Minutes)
Skill Issue Encounter by MicrowavedBunny - ⛧⛧⛧⛧⛧ (???)
Slaughter Map by nxmxlxss - ★★★★★ (~45 Minutes)
UAC Artantica by Cuzzmotion
The Blood Swamps
Master Level by Saleem - ★★★★★ (~75 Minutes)
Master Level by Konvaz - ★★★☆☆ (~50 Minutes)
Idoratrize Blood Swamps by Athollu - ⛧⛧⛧⛧⛧ (~20 Minutes)
Slaughter Map by nxmxlxss
The Holt
Descent into Chaos by TacoWenzdayz - ★★★★★ (~50 Minutes)
Master Level by Saleem - ★★★★☆ (~65 Minutes)
Master Level by offwine - ★★★★★ (~130 Minutes)
Slaughter Holt by Athollu - ★★★★☆ (~25 Minutes)
Master Level by Buttface
(***) Master Level by Draganescu
The Ancient Gods Part 2
The World Spear
Master Level by Delta - ★★★★★ (~80 Minutes)
Recharged World Spear by Jewstin - ★★☆☆☆ (~25 Minutes)
Slaughter Map by nxlxmxss
Demon Possession Challenge by Alby
Slaughter Master Level by quan
The World Den by Payoyo and the Den
Reclaimed Earth
Master Level by Rainlight - ★★★☆☆ (~40 Minutes)
Master Level by proteh - ★★★☆☆ (~35 Minutes)
ReclaimDen by Payoyo - ★★★☆☆ (~40 Minutes)
Unreclaimed Earth by idk929 - ⛧⛧⛧⛧⛧⛧ (~90 Minutes)
Immora
Master Level by Cuzzmotion
Master Level by Konvaz
Slaughter Map by nxmxlxss
Hell Den by Payoyo
The Dark Lord
Master Level by Konvaz - ★★☆☆☆ (~15 Minutes)
Legacy AI Showcase Map by Nayrham
Battlemode
Corrosion by Konvaz - ★★☆☆☆ (~20 Minutes)
Stronghold by Konvaz - ★★★☆☆ (~45 Minutes)
Torment by Konvaz - ★★★★☆ (~80 Minutes)
Extraction by Konvaz
Daisy's Lament by MicrowavedBunny
New idStudio Maps
Levitation - Ascend by Saleem
Beginner Custom Map by Velser
Ported idStudio Maps
Quake E1M1 by nhaselton
Randomizers
Cultist Base by offwine
Mars Core by Beth
Sentinel Prime by offwine
Taras Nabad by Payoyo
Nekravol by Beth
Urdak by Beth
UAC Atlantica by Konvaz
The Blood Swamps by Konvaz
Immora by Cuzzmotion
Misc
The Tutorial Master Level by MrEggawott
The Best Master Level of All Time by Konvaz