MUD (Multi-User-Dungeon /
www.mud.de) is a role-playing game where many players can take part in simultaneously via a connection to the internet. The actual game runs on a server where the individual players can logon using telnet.
Multi-User-Dungeon
In these mostly text-based games, the user can interact with the “environment” and with other players.
The predecessors of MUD have been text-adventures, developed in the early 1970s. Text adventures worked similar to MUD. The main difference was that a player could only interact with NPCs (Non-player character).
In 1979 Roy Trubshaw and his fellow student Richard Bartle from University of Essex developed the first real-time multi-user text-adventure. The game was called Multi-User-Dungeon, coining the term MUD.
In the beginning, MUDs have only been played in university networks. By the mid 1980s the game was accessible through Compuserve in the USA and through the British Telecom in Great Britain as well, reaching an immense number of users.