- 3Kingdoms
- 4 Dimensions
- 7 Degrees of Freedom
- ASSAULT
- AVATAR MUD
- A Rape in Cyberspace
- A Story About A Tree
- A Theory of Fun for Game Design
- Aarchon MUD
- Aardwolf
- Abeir-Toril
- AberMUD
- Achaea, Dreams of Divine Lands
- Act of War
- Advent of the Mists
- After The Plague II
- Akanbar
- AlexMUD
- Alhazi Invasion
- Alter Aeon
- Alter Aeon MUD
- Angel
- AnotherMUD
- Another World
- Arcane Nites
- Arctic
- Area
- Area Editors
- Arion
- Armor
- Avatar
- Baldur's Gate
- Baldur's Gate (city)
- Baldur's Gate (disambiguation)
- BatMUD
- Bedlam
- Beleriand
- Beta testing
- Boat
- Boiling MUD
- British Legends
- Browser game
- CD gamedriver and mudlib
- CGF
- CRPG
- Cajun Nights
- Cameo
- Carrion Fields
- Chiaroscuro
- Chinese gold farming
- Chronology of MUDs
- CircleMUD
- City of Heroes
- Clandestine MUD
- Clans.Watchmen
- Clans.Wolf
- CoH
- Codebase
- Coding
- CoffeeMUD
- Colossal Cave Adventure
- Command
- Comparison of MUD clients
- Computer role-playing game
- Copyover Recover
- Covenant
- Creative Commons Attribution-ShareAlike 3.0 Unported
- Creator
- CthulhuMud
- Cybering
- D&D
- DaisyMUD
- Dark and Shattered Lands
- Darkness Falls
- DartMUD
- David Bennett
- Dawn of Ages
- Dead Souls Mudlib
- Death room
- Derek Harding
- Designing Virtual Worlds
- Diablo III
- Digital object identifier
- DikuMUD
- Diku Family Tree
- Discworld
- Dnd
- Domain
- Dragonball Evolution
- DuneMUSH
- Dune II
- Dungeons & Dragons
- Dungeons & Dragons campaign settings
- DurisMUD
- Dysfunction
- Earth: 2025
- Eddy Carroll
- Elendor MUSH
- EmlenMUD
- End of Time
- End of the Line MUD
- Envy
- Erebus Falls
- Event
- Everquest
- Everwar
- Evolution of Esos
- Experience point
- Faerûn
- Fantasy Land
- Fate
- FateMUD
- Final Fantasy
- Forgotten Realms
- GNSmud
- GP
- Gaia Online
- Game studies
- Gank
- GarouMUSH
- Genesis
- George Reese
- Giant Bomb
- God
- GodWars
- Gold farming
- Grinding
- HSpace
- Hack and slash
- Haunt
- HavenMUSH
- Health
- Help
- Herbert E Gilliland III
- Hidden Worlds
- Hit points
- Hrielith
- IC
- Illarion
- Imaginary Realities
- Infinity (AberMUD)
- Infinity (LPMud)
- InterMUD
- Interactive fiction
- Isengard
- Island of Kesmai
- Islands of Myth
- Item
- Justme
- KallistiMUD
- Kingdoms of the Lost
- KoBra MUD
- LPC
- LPMud
- LambdaMOO
- Land of Chaos
- Lands of Stone
- Lars Pensjö
- Lasher
- Legacy player
- LegendMUD
- Lengeria
- Level-grind
- List of Dungeons & Dragons based MUDs
- List of free massively multiplayer online games
- Lost Souls
- Low-level player
- Lumina
- Luminari MUD
- MCCP
- MIST (MUD)
- MMORPG
- MMO (disambiguation)
- MOO
- MU*
- MUA
- MUD
- MUD-Dev
- MUD-Dev2
- MUD1
- MUD2
- MUDDL
- MUD Family Trees
- MUD Snippets
- MUD Wiki
- MUD client
- MUD directory
- MUD trees
- MUF (programming language)
- MUG
- MUME
- MUSH
- MUSH Manual READ.ME
- MUVE
- MUX
- MZF
- Mac OS X
- Madcatz
- Magic fountain
- MajorMUD
- Mana
- Massively multiplayer online game
- Massively multiplayer online roleplaying game
- Materia Magica Fantasy RPG
- Medieval fantasy
- Medievia
- Merc
- Merc (MUD)
- Message Parsing Interpreter
- Midgaard
- Midpoint Void
- Midpoint Void II
- Mirrors of the Wheel
- Mjolnir
- Mobile
- Module:HtmlBuilder
- Module:Navbar
- Monster
- Monster (game)
- Mordor (MUD)
- Mordor Codebase
- Moses
- MudOS
- Mudlib
- Mudservices.com
- Mudwalker
- NCSA Telnet
- Nameless Merc
- Nannymud
- Nathan Yospe
- Necromundus
- Nerf
- NetHack
- New Worlds
- Newbie
- NiMUD
- NiMUD (The Isles NiMUD)
- Nilgiri, the Forgotten World
- NoPK clans
- Northern Lights
- Not fun
- Nuclear War
- Nuntius
- OOC
- Oladon
- Online Building
- Online Creation
- Online text-based role-playing game
- OtherSpace
- Otherworld
- Out of Character
- Outerworld
- PC
- PDP-10
- PK
- Penthesilea
- Perfect World
- Permadeath
- Pict
- Pit
- Player
- Player interface
- Player versus environment
- Player versus player
- Player wipe
- Power player
- Presence
- Prime
- Project Darkstar
- PvE
- Qurp
- R/MUD
- ROM
- RWT
- Raph Koster
- RavenMUD
- Real-time
- Real life
- Rec.games.mud.misc
- Rehobaom's Legacy
- Remort
- Rich Burlew
- Richard Bartle
- Richard Woolcock
- Roguelike
- Role-playing game
- Roy Trubshaw
- Rusted Promises
- SMAUG
- Sagen
- Second Life
- Seven Kingdoms
- ShadowDale
- Shadow Siege
- Shadowdale (Forgotten Realms)
- SlothMUD
- Social relationships
- Softcode
- Source code
- Spawn point
- Spawning
- Stamina
- Star Wars: Reach of the Empire
- Statistics
- Status effect
- StickMUD
- TNVE
- TOS TrekMUSE
- Talker
- Telepresence
- Telnet
- TerraFirmA
- Terra Nova
- Terre dAnge MUSH
- Text-based
- The Burning Post II
- The Cleft of Dimensions
- The Final Challenge
- The Journal of Virtual Environments
- The Lands of Evermore
- The Laws of Online World Design
- The Mud Companion
- The Mud Connector
- The Two Towers
- The Two Towers Mud
- The Weave
- Theme
- Threshold RPG
- Time
- Timeghost
- TinTin++
- TinyMUCK
- TinyMUD
- TinyMUD Classic
- Tolkien
- TorilMUD
- ToyMUD
- Trace
- TubMud
- Twinlobe
- TwistedMuck
- Ultima Online
- Underdark
- Utopia
- Utopia (online game)
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