Xox is a game that much resembles the traditional Tic-Tac-Toe. However, unlike Tic-Tac-Toe, it is much harder to win (or not lose) a game.
The main difference with the traditional Tic-Tac-Toe is the presence of a score in each field of the board. It is the intention of the player to gain as many points as possible.
Of course it is also possible to play a regular game of Tic-Tac-Toe, should you like to...