Buggy
The fill-a-pix puzzles are really buggy. A few of them have gone right past the puzzle without ever letting me solve it, and one of the squares in one of the later puzzles simply can't be filled in with any color.
Yes, Mystery Mosaics (Full) is completely free and it doesn't have any in-app purchases or subscriptions.
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Mystery Mosaics (Full) is free.
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The fill-a-pix puzzles are really buggy. A few of them have gone right past the puzzle without ever letting me solve it, and one of the squares in one of the later puzzles simply can't be filled in with any color.