I too came here from Game Grumps, and I'm really enjoying it so far. I think it's a very effective elaboration of the Minesweeper concept. My main feedback would be to have some way to mark uncertainty more specifically. Like, if there are two spaces that have exactly 6 points between them, I'd like to be able to mark them both with "6?" instead of only being able to use the 6 or the ?.