- The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids contains all of the digits from 1 to 9.
- Click a white square to display the keypad. Click the number you want to fill to the square from the keypad. To clear the number, click the C.
- There three memo fields in the bottom of each white square. You are free to use the fields.
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