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is a multiplayer real-time virtual world, usually text-based.
MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat.
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.
Most MUDs are run as hobbies and are free to players; some may accept donations or allow players to purchase virtual items, while others charge a monthly subscription fee.
MUDs can be accessed via standard telnet clients, or specialized MUD clients which are designed to improve the user experience.