Interesting - I'm contemplating the same issue in a game of mine. Fortunately, the puzzles are only a sideline to the main game, so if the player gets stuck, it's not TOO bad.
That said, I'm not crazy about any of your ideas. I don't have great alternatives. The best I've thought of for my game is that you earn 'hints' by completing puzzles successfully. Probably for every 3 you complete, you earn 1 hint. But I'm not sure my idea is all that hot either...


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