I agree that it's very good but I'm holding off buying as I fear the levels after those in the trial version won't get much harder and won't take long to finish. Anyone who has the full version find it gets harder? Thanks.
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Definitely gets tough towards the end. If you're good at puzzles and have good reactions you could very easily beat it in a few hours (levels 1-40 don't offer too much challenge but there are some toughies beyond that) and there isn't much of an incentive to replay them, but its a cool and charming game and 200 points is a good price.