Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge. This particular book contains chapters focused on MUDs, MUD clients, MUD games, MU* games, Graphical MUDs, MUD servers, MU* servers, LPMud mudlibs, LPMud gamedrivers, MUD programming languages, MUD developers, MUD terminology, Educational MUDs, MUD organizations, MUD scholars, and MUD texts. More info: A MUD (originally Multi-User Dungeon, with later variants Multi-User Dimension and Multi-User Domain), pronounced, is a multiplayer real-time virtual world described primarily in text. MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat. Players can read or view descriptions of rooms, objects, other players, non-player characters, and actions performed in the virtual world. Players typically interact with each other and the world by typing commands that resemble a natural language.