Tic-tac-toe (also known as noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game. Tic-tac-toe Q brings this great game to your Android. You can enjoy Tic-tac-toe in family game time, or you can also enjoy the game by playing with the AIs of varying difficulties. Beware that it is very challenging to beat the best AI in this game! Support playing online games with thousands of players! You will also gain experience points by winning against the AIs (+1 for Easy, +3 for Medium, +5 for Hard, and +7 for Expert). Features: * Undo * Save/load unfinished game * AIs with four levels of difficulties * Timer based game * Play online