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This repository serves as a digital archive of the source code for "Zork III: The Dungeon Master," a seminal 1982 interactive fiction game developed by Marc Blank, Dave Lebling, Bruce Daniels, and Tim Anderson for Infocom. The code is written in ZIL (Zork Implementation Language), a specialized dialect derived from MDL (Muddle), which itself was based on LISP and created by MIT students and staff. The collection represents a snapshot of Infocom's development system at the time of its shutdown. It includes various files that were both used and discarded during the game's production. While considered canonical for historical study, it may not reflect the exact arrangement of the final production source code due to the iterative nature of Infocom's development process, where games were often created by copying and modifying previous directories. A critical limitation for users is that the source code in this repository cannot currently be compiled into a playable "Z-machine Interpreter Program" (ZIP) file. The original compiler, ZILCH, ran on a TOPS20 mainframe, and the specific means to create these final executables have been lost. Although some ZIP files exist in other Infocom source repositories, they were present at the time of the drive's spin-down and do not necessarily correspond to this specific source snapshot. The primary purpose of this repository is educational and historical. It allows researchers, students, and enthusiasts to study the architecture of early interactive fiction, understand how code was structured for the Z-machine, and analyze how the system handled input and processing. It is an invitation for the community to share discoveries regarding Infocom's history and its innovative technical approaches.