Many different way to play tic tac toe.
Classic tic tac toe, 1 or 2 players
Blind tac toe, 2 players blinded tic tac toe.
Trick tac toe, quick but strategic version for 1 or 2 players.
NINE, a 9 boards tic tac toe more strategic variant, for 2 players.
Tic tac toe and Trick tac toe can be played in "misère" mode tapping on right part of her names, or standar mode tapping on left.
Misère mode is playing to loose. the one who can strike a trhee in a row is the looser.