DikuMUD is a multiplayer online role-playing game that was created in 1990 by a group of students at the University of Copenhagen. It is one of the earliest examples of a MUD (Multi-User Dungeon) and has significantly influenced the development of online gaming. Players explore a fantasy world, interact with each other, and engage in quests while developing their characters. The game features a text-based interface where players can type commands to navigate the environment, fight monsters, and solve puzzles. DikuMUD introduced many concepts that are now standard in online games, such as experience points, character classes, and a rich narrative framework.