There is a post that could be developed here, in this forum:
"Chatting with a game designer friend the other day and we were bemoaning the state of adventure game puzzles and it got us talking. So I was wondering what is your favorite puzzle in Thimbleweed Park, Maniac Mansion, Monkey Island or any other classic point-and-click game?
Do you like head scratchers? What makes a puzzle good? What makes a puzzle hard? What makes a puzzle just busy work? Is that bad?"
– Ron Gilbert