Zork I: The Great Underground Empire

Zork I: The Great Underground Empire (Multi, 1980) has an official source code release, historicalsource/zork1, and 3 other public projects, including an open-source reimplementation. An agent environment already wraps it.

Data checked 2026-10-12 · unbaked registry

ZIL

Projects

historicalsource/zork1 (Microsoft MIT relicense)

Source releaseZIL (compile with ZILF) -> Z-machine story file2,956 starspushed 2025-11-20MIT license

Zork I (Microcomputer Version) by Infocom

Original Infocom ZIL source officially open-sourced under MIT by Microsoft OSPO/Xbox/Activision on 2025-11-20 (PR to Jason Scott's repo).

historicalsource/zork1-gold

Source releaseZIL/ZAP Infocom source (compile with ZILF/ZAPF) -> Z-machine story fi…180 starspushed 2019-04-19no license

Zork I (Microcomputer Version) (Solid-Gold Edition) by Infocom

Original Infocom source archived by historicalsource (2019); no license (Zork I-III relicensed MIT in Nov 2025, others not)

zorkClone

Reimplementation19 starspushed 2023-06-01Apache-2.0 license

A reimplementation of the original Zork game developed by Infocom

dropped from awesome-decomp-games: awesome-game-remakes-only, <

Frotz

ReimplementationCGPL-2.0 license

Reference Z-machine interpreter. The GitHub mirror (DavidGriffith/frotz) has moved to GitLab. Wikipedia also lists ZIP, JZIP, Zip 2000, Zip Infinity and Nitfol.

What you need

You need your own copy of the game: these projects ship code only.

Agent environments

microsoft/jericho

Same toolchain

GameMethodYearStarsLast push

OTHZorkSource release19771.1k2026-06-30 MULTZork III: The Dungeon MasterSource release19829192025-11-20 MULTZork II: The Wizard of FrobozzSource release19818442025-11-20 MULTThe Hitchhiker's Guide to the GalaxySource release19841682019-04-19 MULTPlanetfallSource release1983662019-04-19 MULTWishbringerSource release1985562019-04-19 MULTDeadlineSource release19821302019-04-16 MULTZork Zero: The Revenge of MegabozSource release19881292019-04-16

More on Multi

GameMethodYearStarsLast push

MULTBeyond Zork: The Coconut of QuendorSource release19871192019-04-16 MULTBureaucracySource release19871132019-04-16 MULTThe Restaurant at the End of the UniverseSource release1112019-04-16 MULTSuspendedSource release19831092019-04-16 MULTA Mind Forever VoyagingSource release19851022019-04-16 MULTStarcrossSource release1982892019-04-16 MULTStationfallSource release1987872019-04-16 MULTLeather Goddesses of PhobosSource release1986852019-04-16

Found via waxy.org/2025/11/microsoft-open-sources-zork-i-i, thurrott.com/games/329907/microsoft-open-sources, SubmitGame/awesome-decomp-games/blob/main/data/d, radek-sprta/awesome-game-remakes, en.wikipedia.org/wiki/List_of_game_engine_recrea

GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.