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Monster was a multi-user adventure game created by Richard Skrenta for the VAX and written in VMS Pascal.

It was publicly released in November 1988.

Monster was disk-based and modifications to the game were immediate.

Monster pioneered the approach of allowing players to build the game world, setting new puzzles or creating dungeons for other players to explore.

Monster, which comprised about 60, 000 lines of code, had a lot of features which appeared to be designed to allow Colossal Cave Adventure to work in it.

Though there never were many network-accessible Monster servers, it inspired James Aspnes to create a stripped down version of Monster which he called TinyMUD.