- The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contains all of the digits from 1 to 9.
- Click a cell to display the keypad. Click the number you want to fill to the cell from the keypad. To clear the number, click the C.
- You can also use the keyboard to enter numbers. Place the mouse cursor over the cell and press a number key. To clear the number, press the DEL key or the 0 key.
- There three memo fields in the bottom of each cell. You are free to use the fields.
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