Beat your opponent in Tic Tac Toe by answering the division problems as fast as you can. If you do, then you can place your "X" or your "O" on the board. Answering the problem incorrectly or slower than your opponent allows your opponent to play their "X" or "O" on the board. Just like in Tic Tac Toe, the first player to line up 3 of their pieces in a row (horizontally, vertically or diagonally) wins the game.
When it is your turn, click on the GO button and answer the division problem as quickly as you can. If you answer correctly and faster than your opponent you will be prompted to place your X or your O. More detailed instructions can be seen in the game.