I'm glad you mentioned that. I often fondly remember that puzzle in Monkey Island and it's one of my favorites as well.
Another one of my favorite puzzles is Le Serpent Rouge in Gabriel Knight 3. I have to admit it's really hard and I've never been able to solve it without a walkthrough but I just love the concept of it and the way you go about solving it. Just sitting alone on your laptop in your cozy hotel room in a sleepy village. Poring over mysterious documents and the map. Classic.
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