Steps 25-27
| Step 25 | ||
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Single Possibility The highlighted column only has one empty tile. Its value must be the one missing number, 2. |
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| Step 26 | ||
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Single Possibility There is only one empty tile in the highlighted 3x3 square. The missing numbers is 4, so the tile must be 4. |
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| Step 27 | ||
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Single Possibility There is only one empty tile in the highlighted column. The value must be the missing number, 4. |
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