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Sierra On-Line accidentally included the source code to their AGI adventure game engine on some copies of Space Quest II. Its presence is not obvious but with enough sector sleuthing it is possible to recover about 70% of it. The recovered source code is peppered with illuminating comments regarding its history and authors. It can be examined in a GitHub repo linked in the article.

"The Space Quest II Master Disk Blunder"
https://lanceewing.github.io/blog/sierra/agi/sq2/2024/05/22/do-you-own-this-space-quest-2-disk.html

The C source code shown reconstructed.
In-game scene showing a status line produced by the source code.