Bad algorithm.
Each square’s row of 3 contains 1, 2 & 3. Another row contains 4, 5 & 6 and the other row will contain 7, 8 & 9. Same on all levels of difficulty. Makes it very easy once you realise this. Very boring and repetitive, so don’t bother with it. Much better options. Shame because layout is good. I’d get my money back if I could. Probably the worst sudoku app I’ve played. Found a better one, much more challenging where each row in a square could have any number.
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