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Help

How to enter numbers?
Place the cursor on a blank square, you will see two dotted boxes. Click a box, you will see a number pad. Then click a number, that number will be entered. The small box is for your note only, and the small numbers will not be counted as an answer. If you need to delete a number, just click the box and select delete.

How to change pen color?
You can select a color to enter the numbers. After you have selected a color, that color will stay until you change the color. It will be helpful to use different color to enter your answer, because you can easily erase numbers with a certain color.

How to erase numbers of a color?
Click a color square at the Erase row, all the numbers of that color will be erased.
How to start a new sudolku puzzle?
You can start a sudoku puzzle at one of the five difficulty levels. Level 1 is the easiest and Level 5 is the hardest. Just click the difficulty level of your choice, a new sudoku puzzle will be displayed.