Multi-user dungeon

Lore & Background

The first MUD was created in 1978 by Roy Trubshaw, a student at the University of Essex in the UK, who wrote it in MACRO-10 assembly language for a DEC PDP-10. He named the game MUD (Multi-User Dungeon) in tribute to the Dungeon variant of Zork. Trubshaw later converted MUD to BCPL before handing development to fellow student Richard Bartle in 1980. The game revolved around gaining points until a player achieved the Wizard rank, granting immortality and special powers. It became the first Internet multiplayer online role-playing game in 1980 when the university connected to the wider ARPANET.

Inspired by the original MUD, numerous derivatives and similar games emerged in the 1980s. These included MIST, Gods, MirrorWorld, SHADES, and Federation II. However, not all early MUD-like games were derivatives: Scepter of Goth (1978) was created on the PLATO system and predates the original MUD, while Dungeons of Kesmai (1980) was released on CompuServe as a separate development. The original MUD was closed in late 1987 because Richard Bartle left the university and the system was decommissioned.

Reader's Guide

MUDs are historically significant as the direct ancestors of modern massively multiplayer online role-playing games (MMORPGs) such as EverQuest and Ultima Online, as well as social virtual worlds like Second Life. Before the term MMORPG was coined, such games were simply called graphical MUDs. Many influential MMORPG designers began as MUD developers or players, including Raph Koster, Brad McQuaid, Matt Firor, and Brian Green. MUDs also attracted academic interest from fields including communications, sociology, law, and economics, and were even considered by the United States military for teleconferencing. Beyond gaming, MUDs have been used for education, chat environments, and research in computer science, geoinformatics, medical informatics, and analytical chemistry. Most MUDs are run as hobbies and are free to play, though some accept donations or charge subscription fees. They can be accessed via standard telnet clients or specialized MUD clients.

Did You Know?

• The first MUD was created in 1978 by Roy Trubshaw at the University of Essex, inspired by the Dungeon variant of Zork.
• Before the term MMORPG was invented, games of that style were simply called graphical MUDs.
• MUDs have been used for purposes beyond gaming, including education, computer science research, and medical informatics.

Origins and the Birth of a Genre

The roots of the multi-user dungeon stretch back to 1975, when Will Crowther built Colossal Cave Adventure on a DEC PDP-10, creating what is widely recognized as the first broadly played adventure game. Don Woods expanded it the following year, weaving in Dungeons & Dragons elements and a computer-controlled dungeon master. Around the same period, a cluster of dungeon-crawling titles emerged on the PLATO system at the University of Illinois and other campuses, with games like oubliette, moria, and drygulch pushing the boundaries of 3D graphics, storytelling, and team play by 1978–79. In the summer of 1977, MIT students crafted Zork for the PDP-10, which gained a following across the ARPANET. The true leap toward multiplayer interaction came in 1978, when Roy Trubshaw, a student at the University of Essex in England, began coding a multi-user adventure in MACRO-10 assembly language. He named it MUD as a nod to the Dungeon variant of Zork he had enjoyed. Trubshaw later translated the code into BCPL and, in 1980, passed the project to fellow student Richard Bartle. The game's central loop involved earning points until a player achieved the Wizard rank, granting immortality and dominion over lesser characters.

The Architecture of Text-Based Worlds

A multi-user dungeon is, at its core, a real-time virtual environment where multiple participants coexist and interact simultaneously. Rather than relying on graphics, traditional MUDs present the world through written descriptions of rooms, objects, fellow players, and non-player characters. Players navigate and act by typing commands that mimic natural language, controlling a character often referred to as an avatar. The genre blends several distinct traditions: the class-based progression of role-playing games, the combat focus of hack-and-slash titles, the competitive tension of player-versus-player encounters, the narrative structure of interactive fiction, and the social spontaneity of online chat. While fantasy settings populated by fictional races and monsters remain the most common backdrop—many MUDs were explicitly built around the dice-rolling mechanics of the Dungeons & Dragons franchise—other worlds draw from science fiction, popular literature and film, historical periods, and even universes of anthropomorphic animals. Crucially, not every MUD is a game at all; some serve as educational tools, others function as pure chat spaces, and the flexible server architecture has been repurposed for research in computer science, geoinformatics, medical informatics, and analytical chemistry.

From Essex to the Modern MMORPG

The lineage from the original MUD to today's sprawling graphical role-playing games is direct and well documented. When the University of Essex connected its internal network to ARPANET, the MUD running there became the first Internet-based multiplayer online role-playing game in 1980, effectively igniting the online gaming industry. Before the term MMORPG was ever coined, games of that style were simply referred to as graphical MUDs. The designers who would go on to create landmark titles like EverQuest and Ultima Online—Raph Koster, Brad McQuaid, Matt Firor, and Brian Green—began their careers as MUD developers or players, while figures such as Mark Jacobs and J. Todd Coleman were involved with early MUDs. Even the social virtual world genre exemplified by Second Life traces its conceptual DNA back to the MUD tradition. The original Essex MUD, later known as MUD1, was shut down in late 1987, reportedly under pressure from CompuServe, to whom Richard Bartle had licensed the game. Its successor on the same network, a derivative called MIST, continued until the PDP-10 machine hosting it was replaced in early 1991.

A Community That Outgrew the Dungeon

The cultural footprint of MUDs extends beyond entertainment. Academic scholars in communications, sociology, law, and economics have drawn on MUD communities as subjects of study, and at one point the United States military explored their potential for teleconferencing. The commercial and social ecosystem around the original game was equally vibrant. In 1985, a wave of derivative projects sprang from MUD1: Ben Laurie's Gods, which added online creation to its endgame and became a commercial MUD by 1988; Pip Cordrey's MirrorWorld, a Tolkien-inspired clone built by a group gathered on a BBS to run on a home computer; and Neil Newell's SHADES, started over Christmas 1985 when MUD1 was closed for the holidays. SHADES eventually reached UK players through British Telecom's Prestel and Micronet networks, but a scandal on the platform contributed to the closure of Micronet—a story later captured in Indra Sinha's net-memoir The Cybergypsies. Meanwhile, Compunet launched Multi-User Galaxy Game as a science-fiction alternative to the fantasy MUD1 it was running. Most MUDs remain hobby projects, free to access, though some accept donations, sell virtual items, or charge monthly subscriptions, with players connecting via standard telnet clients or purpose-built MUD clients listed on portals like The Mud Connector.