Any puzzle that makes me search through a walkthrough - because at that point I feel like the puzzle doesn't fit the game and it's a disappointment. Usually these are action elements that are really badly integrated. It just spoils the flow of a good game for me and I wish more designers would either let you bypass or set low action/high puzzle content. Otherwise I like spending time trying to figure out a difficult puzzle if it makes sense in the context of the game.
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