Location: PHPKode > scripts > Sudoku Solver > open-hard1.txt
, , , , , , 7, , 9, 
3, , , , , 9, , 4, , 
, , , , , 7, 3, 8, , 
, , , 9, , 3, 6, 5, , 
, 6, 3, 7, , 1, 2, 9, , 
, 7, 5, 4, , 2, , , , 
, 3, 9, 1, , , , , , 
, 1, , 2, , , , , 5, 
5, , 6, , , , , , , 
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