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MUDDL (Multi-User Dungeon Design Language) is a programming language for constructing text-based multiplayer games known as MUDs (multi-user dungeons). MUDs simulate environments through textual descriptions and allow multiple users to interact in real time. The language was developed by Trubshaw, Bartle, and Taylorback in the late 1970s at the University of Essex. MUDDL was one of the earliest programming tools designed specifically for creating virtual worlds on computers connected over networks. It had an influence on later languages and systems for interactive fiction and online gaming.