Microsoft Open-Sources Classic Text Adventure Zork Trilogy

Microsoft has released the source code for Zork I, II, and III under the MIT License through a collaboration with Team Xbox and Activision that involved submitting pull requests to historical source repositories maintained by digital archivist Jason Scott. Each repository now includes the original source code and accompanying documentation.

The games arrived on early home computers in the 1980s as text-based adventures built on the Z-Machine, a virtual machine that allowed the same story files to run across different platforms. Infocom created the Z-Machine after discovering the original mainframe version was too large for home computers. The team split the game into three titles that all ran on the same underlying system.

The code release covers only the source files and does not include commercial packaging or trademark rights. The games remain available commercially through The Zork Anthology on Good Old Games and can be compiled locally using ZILF, a modern Z-Machine interpreter.

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