Have you ever tried "Fish Fillets NG"?
It's one of my favorite games. It's a very fun free hard puzzler.
fillets.sourceforge.net
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I have it downloaded, but haven't yet played it. I'll get to it someday. In the meantime, I've played Fish Fillets 2.
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That is hard. As is Jelly no Puzzle, and, of course, Snakebird.