Had this book as a child, rented it out many times, made it through some puzzles but definitely not all (nor the "secret" puzzle that one has to do at the end of the book.

Looking back, a couple things:
1) The art is gorgeous, any page could be posterworthy in their own way.
2) I really appreciate how so many of the puzzles wind up requiring a close reading of the book as a whole. I don't think I learned the lesson well as a child, but had I solved this book then I would have developed so many good problem solving tools that would carry into my day-to-day efforts.
3) There are a few puzzles I wish didn't rely on brute force, or red herrings, but not enough for me to feel they diminished from the book.
4) The final puzzle is dastardly and I'm curious to see how people throughout the years handled it!

Really sad this book hasn't been reprinted, it's a beautiful thing for a shelf and I'd love to introduce it to more people with less fear about how they'd grapple with it >:) ( )