This is a Mystery Hunt puzzle, so solving the obvious puzzle is only the first step of solving the puzzle. You will need to do something with the puzzle solution to somehow get a word or short phrase.
I remember doing this one by hand over a decade ago. Fond memories.
I also solved it by hand many years ago but I think I never realized there was another layer to it! I was pretty proud of myself when I solved it so I’m pretty sure I kept my hand-written solution somewhere — will have to dig it up again!
I remember doing this one by hand over a decade ago. Fond memories.
https://puzzles.mit.edu/