Thanks! I'll admit I was using a package to generate the sudoku and only then added the incorrect clue
As far as the keys, I a) forgot to put in the description that you can use P to switch to pen and N to switch to notes! and b) tried, but wasn't able to get the selected box to refocus after clicking one of the inputs below. B is something I intend to work on after the jam, and I can probably edit the description right now so thanks for letting me know!