Cute. What I don't get is, if the center (all 609 previous levels of the Grid) constitutes an "X", then why didn't the vertical column of "X"s win already? And if it is an "O", why didn't you strike through the diagonal as well?

Thanks for clearing this up!

Love, Roz

P.S. Do you call this game "Tic Tac Toe" or "Naughts and Crosses"?