I found The Maze at the San Francisco Museum of Modern Art sometime in the 80s. I was mesmerized by it, but never got anywhere near solving it.
It was like a graphical choose-your-own-adventure or an early graphical computer game. At the time, there was a reward of some few thousand dollars for the first person to solve the riddle of the book. I never even came close.
I still think it’s pretty cool that they’ve hyper-textualized this book and put it online. Go internet!