Talk:Sudoku/@comment-5334617-20140523015504

Suggestion for future display: have the digits 1..9 all printed in black somewhere, then, once all 9 sub-squares have say a '4' in them, change the '4' to light grey. Frequently in my puzzle-solving, I find myself saying "I'll try to fill in any 1s that I can", then "... 2s ...", etc.. So much so, before even starting a puzzle on paper I'll write the digits 1-9, and cross each out when there's one of it in each sub-square so I don't have to go through the step "I'll try to fill in any 4s that I can" when all the 4s are already filled.