Yes, Noesis is completely free and it doesn't have any in-app purchases or subscriptions.
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Noesis is free.
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I have just completed all 70 of these puzzles and found them to be quite challenging. I paid 99p each to complete 5 of them because there is no walkthrough information anywhere on the web. It is a really good logic game too and very mind testing and rewarding.
Had to think a long time on some of these! But that’s the whole point, so give it a try if you want to feel smart! Or not ;).
