Just how smart do you think you are? Finnish mathematician, Arto Inkala, designed this Sudoku challenge and is specifically designed to be unsolvable to all but the sharpest minds.
Can’t crack it? The answer is here.
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1 2 3 4 5 6 7 8 9
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1: 8 1 2 7 5 3 6 4 9
2: 9 4 3 6 8 2 1 7 5
3: 6 7 5 4 9 1 2 8 3
4: 1 5 4 2 3 7 8 9 6
5: 3 6 9 8 4 5 7 2 1
6: 2 8 7 1 6 9 5 3 4
7: 5 2 1 9 7 4 3 6 8
8: 4 3 8 5 2 6 9 1 7
9: 7 9 6 3 1 8 4 5 2