Think you're a Tic Tac Toe Master? Prove it in Tic Tac Toe Master! Play against the computer or a friend and take turns placing an X or O on the board. Get 3 in a row to win the game! A game where neither player gets 3 in a row is a tie. Win more games than your opponent before time runs out. Choose the Customize option to change up the game, such as using a board as large as 8x8 and changing the game timer.