Bad algorithm.
Each square鈥檚 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鈥檛 bother with it. Much better options. Shame because layout is good. I鈥檇 get my money back if I could. Probably the worst sudoku app I鈥檝e played. Found a better one, much more challenging where each row in a square could have any number.
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