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How to make your own Sudoku puzzles
| Step 15 - Sorting out the undecided cells. |
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Looking at the row with the dotted line, the possibility for a 6 is only in the marked cell. |
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A 5 had two possibilities in the centermost block, but now that a 6 filled one of the cell, the 5 goes to the other one. Therefore, a 5 is fixed at the bottom center block, as well. |
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Then cells S, T, U, V and W are fixed automatically in this order. |
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According to the 2 in the middle left block, cell X becomes 2, and the cell Y becomes 8, the last number in its column. |
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The marked exposed cell is fixed as 9, according to the 9 in the top right block. |
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