There is absolutely nothing wrong with using the greens. And guessing is also a legitimate solving technique.
TallMike - Using greens is just the electronic equivalent of putting in small numbers with a pencil or pen when solving Sudoku on paper. I use them if I need them. This is not a
competition - it is just for fun. I have seen Sudoku competitions - and most competitors use "green", i.e. they write down the possibilities.
Done. No guesses.
Difficulty score 25. No green.
ng - ng
and yes I think in yesterday''s i made that lucky mistake.
Real easy except for one virtual. Still challenging. 18.
My take on greens and guesses -- Hey, I'm doing Sudoku to improve my visualization, retention, perseverance, thought continuity and creative problem solving.