Enter digits via the onscreen keypad or a keyboard.

Pressing and holding a digit in the onscreen keypad allows a digit to be placed repeatedly without having to reselect it each time.

Use Check to see how you're doing so far, only incorrect numbers will be highlighted.

Use 'Notes' to enter possible answers for a cell.

Fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9.