If anyone's interested in this sort of puzzle, the game Noita is filled with them. A large chunk of the code's in lua and you can inspect it!
The final puzzle for the game is a cryptographic puzzle that's been unsolved for five years now. Folk have done just about everything imaginable to solve the puzzle.
Adding onto this, the Noita Eye messages are a great read for someone who has some spare time:
I could never grok Noita, I spent many hours, but I can't get past the first part.
There's definitely something about it that I'm not getting.
In my experience getting healing is super rare and I end up dying eventually.