You can now download the source code for all Infocom text adventure classics
Yes, The Hitchhiker’s Guide to the Galaxy and Zork are both included.
The source code of every Infocom text adventure game has been uploaded to code-sharing repository GitHub, allowing savvy programmers to examine and build upon some of the most beloved works of digital storytelling to date.
“All parts should go together without forcing. You must remember that the parts you are reassembling were disassembled by you. Therefore, if you can’t get them together again, there must be a reason. By all means, do not use a hammer.” —IBM Manual, 1925