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Overall, The Mystery of the Crystal Portal is a very pretty game, and you can certainly get a few hours of solid game time out of it, but it is slow and you must be wary of extra sales features. The full price of $4.99 is much too high for what it offers, but if you act now, there is a 40% off sale until May 3rd.
If you enjoy story based hidden object games with puzzles, Mystery of the Crytal Portal is just what you're looking for.