This applet is not intended for interactive sudoku game but just to help you solve a sudoku problem.
This means that you cannot expect to see sudoku grid generation or to have support for notes
(see
here and
here for that): here you can only
ask for the whole solution or for a little hint if you are blocked but you don't want to give it up.
Instructions: fill the grid with values and hit "solve" if you want the whole solution or "hint" if you want
just one more cell to be filled. A red question
mark (?) appears if your input is wrong and there is no possible allowed value for a
certain cell.