Role playing chat bot
The game was significantly expanded in 1976 by Don Woods.
Also called Adventure, it contained many D&D features and references, including a computer controlled dungeon master.
Not all MUDs are games; some are designed for educational purposes, while others are purely chat environments, and the flexible nature of many MUD servers leads to their occasional use in areas ranging from computer science research to geoinformatics to medical informatics to analytical chemistry.
Colossal Cave Adventure, created in 1975 by Will Crowther on a DEC PDP-10 computer, was the first widely used adventure game.
In 1978 Roy Trubshaw, a student at Essex University in the UK, started working on a multi-user adventure game in the 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, which Trubshaw had greatly enjoyed playing.
Inspired by Adventure, a group of students at MIT in the summer of 1977 wrote a game for the PDP-10 minicomputer; called Zork, it became quite popular on the ARPANET.
Zork was ported, under the filename DUNGEN ("dungeon"), to FORTRAN by a programmer working at DEC in 1978.