{"id":98292,"date":"2025-11-20T10:00:00","date_gmt":"2025-11-20T18:00:00","guid":{"rendered":""},"modified":"2026-02-24T13:22:01","modified_gmt":"2026-02-24T21:22:01","slug":"preserving-code-that-shaped-generations-zork-i-ii-and-iii-go-open-source","status":"publish","type":"post","link":"https:\/\/opensource.microsoft.com\/blog\/2025\/11\/20\/preserving-code-that-shaped-generations-zork-i-ii-and-iii-go-open-source\/","title":{"rendered":"Preserving code that shaped generations: Zork I, II, and III go Open Source"},"content":{"rendered":"\n

Today, we\u2019re preserving a cornerstone of gaming history that is near and dear to our hearts. Together, Microsoft\u2019s Open Source Programs Office (OSPO), Team Xbox, and Activision are making\u00a0Zork I<\/em>,\u00a0Zork II<\/em>, and\u00a0Zork III<\/em>\u00a0available under the MIT License. Our goal is simple: to place historically important code in the hands of students, teachers, and developers so they can study it, learn from it, and, perhaps most importantly, play it.<\/p>\n\n\n\n

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Find Zork 1 GitHub repository here<\/a><\/div>\n<\/div>\n\n\n\n

A game that changed how we think about play<\/h2>\n\n\n\n

When Zork<\/em> arrived, it didn\u2019t just ask players to win; it asked them to imagine. There were no graphics, no joystick, and no soundtrack, only words on a screen and the player\u2019s curiosity. Yet those words built worlds more vivid than most games of their time. What made that possible wasn\u2019t just clever writing, it was clever engineering.<\/p>\n\n\n\n

Beneath that world of words was something quietly revolutionary: the Z-Machine, a custom-built engine. Z-Machine is a specification of a virtual machine, and now there are many Z-Machine interpreters that we used today that are software implementations of that VM. The original mainframe version of Zork<\/em> was too large for early home computers to handle, so the team at Infocom made a practical choice. They split it into three games titled Zork I<\/a><\/em>, Zork II<\/a><\/em>, and Zork III<\/a><\/em>, all powered by the same underlying system. This also meant that instead of rebuilding the game for each platform, they could use the Z-Machine to interpret the same story files on any computer. That design made Zork<\/em> one of the first games to be truly cross-platform, appearing on Apple IIs, IBM PCs, and more.<\/p>\n\n\n

\"Original<\/figure>\n\n\n\n

Preserving a piece of history<\/h2>\n\n\n\n

Game preservation takes many forms, and it\u2019s important to consider research as well as play. The Zork source code deserves to be preserved and studied. Rather than creating new repositories, we\u2019re contributing directly to history. In collaboration with Jason Scott, the well-known digital archivist of Internet Archive<\/a> fame, we have officially submitted upstream pull requests to the historical source repositories of Zork I<\/a><\/em>, Zork II<\/a><\/em>, and Zork III<\/a><\/em>. Those pull requests add a clear MIT LICENSE and formally document the open-source grant.<\/p>\n\n\n\n

Each repository includes:<\/p>\n\n\n\n