Tic-Tac-Toe play online

Tic-Tac-Toe is one of the most popular casual game in a world. You can play with another player using "Hot Seat" mode, or play against AI. Rules are all the same:
- The game is played on a grid that's 3 squares by 3 squares.
- You are X, your friend (or the computer) is O. Players take turns putting their marks in empty squares.
- The first player to get 3 of her marks in a row (up, down, across, or diagonally) is the winner.
- When all 9 squares are full, the game is over.