StivStiv 162k1212 gold badges588588 silver badges875875 bronze badges $endgroup$ two $begingroup$ Dang that's difficult. I'm not used to pondering like that. Thanks for that approach. $endgroup$ tazboyTo unravel medium Sudoku puzzles, all you may need is a pencil and eraser (or maybe a electronic Sudoku app or Internet site). It can also be helpful