Zork I: The Great Underground Empire — Infocom, by Marc Blank, Dave Lebling, Bruce Daniels and Tim Anderson. Source code (c) 2025 Microsoft, released under the MIT License (LICENSE.txt).
Source: https://github.com/historicalsource/zork1 at revision 97b7b3d68c075dd9af7da499c3e9690ada3471fd.
Microsoft's release covers the source code only; it grants no trademark rights and excludes Infocom's
packaging, artwork and marketing materials. None of those are used here. Zork is a trademark of its
respective owner; Leaf Arcade is not affiliated with Microsoft, Activision or Infocom.

Story file: zork1.z3 (SHA-256 17ab285e95c5dfa19eb2f4bd3736637ce650042b875a4ae4be20776d86e8c72f), built by Leaf Arcade from that source with
ZILF 0.11.1 (scripts/interactive-fiction/build-zork.sh). It is not one of the story files Infocom
shipped: the source is a snapshot of Infocom's archive, and the release and serial numbers in the
banner are ZILF's.
No source changes.
The ZIL source as built, without Infocom's precompiled files, is in source/.
zork1.z3.js holds the same bytes, base64-encoded for Parchment's loader.
Interpreter: Parchment 2026.8.23, MIT (../parchment/NOTICE.txt). No account or external service is used.