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How to make your own Sudoku puzzles
| Step 11 - Consider the constraints of the rows. |
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Let's see where a 6 goes in the row shown in dotted line. We have to put a 6 to either H or I. |
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Whichever is fine, but say we set I 6. We need to proceed carefully from now on, or it may break down. |
| Step 12 - Use 9s. |
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So far, the untouched numbers are 2s, 8s, and 9s. Now, let's use 9s. Place a 9 here. |
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Then, the marked cell becomes 9. |
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Let's place a 9 on the exposed cell in the bottom center block. Then, in the column shown in the dotted line, only the marked cell can accept a 9. |
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We need to go on very carefully or the puzzle may break down quite easily. And it's time for giving up our policy not to put numbers on the exposed cells. |
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