Title: MUD1
Content:   Multi-User Dungeon, or MUD (referred to as MUD1, to distinguish it from its successor, MUD2, and the MUD genre in general), is the first MUD and the oldest virtual world in existence.
Title: MUD1
Content:  MUD was created in 1978 by Roy Trubshaw and Richard Bartle at the University of Essex on a DEC PDP-10. Trubshaw named the game Multi-User Dungeon, in tribute to the Dungeon variant of Zork, which Trubshaw had greatly enjoyed playing. Zork in turn was inspired by an older text-adventure game known as Colossal Cave Adventure or ADVENT. MUD1 was written in the domain-specific programming language Multi User Dungeon Definition Language (MUDDL). Its first version was written by Richard Bartle and Roy Trubshaw in BCPL. It was later ported to C++ and used in other MUDs such as MIST. In 1980, Roy Trubshaw created MUD version 3 in BCPL (the predecessor of C), to conserve memory and make the 
Title: MUD
Content:  A MUD (originally multi-user dungeon, with later variants multi-user dimension and multi-user domain) is a multiplayer real-time virtual world, usually text-based. MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat. Players can read or view descriptions of rooms, objects, other players, non-player characters, and actions performed in the virtual world. Players typically interact with each other and the world by typing commands that resemble a natural language. Traditional MUDs implement a role-playing video game set in a fantasy world populated by fictional races and monsters, with players choosing classes in order to gain specific skills 
Title: MUD1
Content:  This resulted in the deletion of the MUD account in October 1987. This left MIST, a derivative of MUD1 with similar gameplay, as the only remaining MUD running on the Essex University network, becoming one of the first of its kind to attain broad popularity. MIST ran until the machine that hosted it, a PDP-10, was superseded in early 1991. MUD1 ran under the name British Legends until late 1999 and was retired along with other software during CompuServe's Y2K cleanup efforts. In 2000, Viktor Toth rewrote the BCPL source code for MUD1 to C++ and opened it alongside MUD2 on British-legends.com. In 2014, Stanford University secured permission to redistribute the game's blueprints from the authors of MUD1.
Title: MUD2
Content:  MUD2 is the successor of MUD1, Richard Bartle's pioneering Multi-User Dungeon. Rather than a sequel, it is the result of over 20 years of continuous development, and is still largely based on the game's original code. The game is nominally a roleplaying game, with a very strict set of rules, character classes and levels. Character progress up a ladder of 11 levels until they reach the traditional MUD goal of wiz (wizard or witch). Characters move between locations, or game rooms, using compass directions, and basic commands such as GET LONGSWORD, GET DIAMOND, KILL DWARF WITH LONGSWORD. Points are scored by dropping treasure in the room known as the swamp, killing an NPC, or killing another player. The game also includes magical powers, which are gained through a mystical artifact known as The Touchstone. The small side effect of 
Title: MUD
Content:  As a noun, the word MUD is variously written MUD, Mud, and mud, depending on speaker and context. It is also used as a verb, with to mud meaning to play or interact with a MUD and mudding referring to the act of doing so. A mudder is, naturally, one who MUDs. Compound words and portmanteaux such as mudlist, mudsex, and mudflation are also regularly coined. Puns on the "wet dirt" meaning of "mud" are endemic, as with, for example, the names of the ROM (Rivers of MUD), MUCK, MUSH, and CoffeeMUD codebases and the MUD Muddy Waters.
Title: MUD
Content:  While there have been many variations in overall focus, gameplay and features in MUDs, some distinct sub-groups have formed that can be used to help categorize different game mechanics, game genres and non-game uses.
Title: MUD
Content:  Roleplaying MUDs, generally abbreviated as RP MUDs, encourage or enforce that players act out the role of their playing characters at all times. Some RP MUDs provide an immersive gaming environment, while others only provide a virtual world with no game elements. MUDs where roleplay is enforced and the game world is heavily computer-modeled are sometimes known as roleplay intensive MUDs, or RPIMUDs. In many cases, role-playing MUDs attempt to differentiate themselves from hack and slash types, by dropping the "MUD" name entirely, and instead using MUX (Multi-User Experience) or MUSH (Multi-User Shared Hallucination).
Title: Discworld MUD
Content:  The MUD's software is divided into two sections — the mudlib and the driver. The MUD is based on a from-scratch mudlib and runs on FluffOS, a fork of the MudOS driver, placing it in the LPMud family. The driver is largely open-source, with new releases usually made available quickly, while cut-down versions of the mudlib including most of the underlying features are occasionally released (most recently in 2003), allowing the use of most of the basic object classes and tools of the MUD. It is expected that players who wish to help with coding the game will apply to join the game's development team, rather than working independently and submitting patches. Developers are not automatically taken from players at a certain 
Title: MUD trees
Content: Also known as MU* 

Question: What genre is MUD1?
Answer: MUD.
multi user dungeon.
multi-user dimension.