In General, just enter the pre-defined boxes of the puzzle you want to solve on the Sudoku grid above and press the button Solve.

You can enter digits one by one by clicking on the target box, a keyboard should appear, press on the digit you wanna enter or press on Del if you want to remove the digit on that box, the keyboard will close automatically. If you don't want to change the box content you can close the keyboard by clicking on the X on the top right corner.

You can also select multiple boxes to fill simultaniously, press and hold (long-press) a box to enter multi-selection mode, then use simple click to select/unselect boxes, the selected boxes will be high-lighted, once you're done press and hold (long-press) any box to quit the multi-selection mode and show the keyboard. if you close the keyboard you go back to multi-selection mode and you can continue selecting. else, once you enter/delete a digit, your selection will reset.

PC keyboard shortcuts:

• 1, 2, 3, ... , 9 : enter digits from 1 to 9
• Del, Backspace, 0 : erase digit (Del)
• Esc : hide keyboard

Solving Speed:
It is the speed of printing each digit found while solving (range: 1s - 0s), if full speed is selected the puzzle will be solved instantly!

In case you wanna Restart, you can click on Refresh