genina.com: Forum

I would like to see an option where all valid pencil marks for all cells are turned on. Then, when a number is entered into a cell, the pencil marks that are rendered invalid by the selection (row, colomn, and box) are erased (true automatic operation). If a cell selection is erased, the now-valid penicl marks would re-appear. That would aid me with the extreme puzzles.
Presently, it takes a little time to "set up" the puzzle doing this manually.
Thanks