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Step by step example of solving a level 5 (very hard) sudoku puzzle
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Let's look at the center box again (where DEF cross MNO). We can't put a 1 in row D because there's a 7 in cell DL. Remember the sudoku game rules – Each row must contain the numbers 1 to 9, which means you can’t repeat a number twice in the same row. Therefore, the only available cell in this sudoku box is cell FN. |
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