This puzzle game is known to all since school times. All played it in school notebooks, whenever possible, to be able to identify the most careful and clever player. The game is very popular so far, and to play it pretty simple. There are nine squares, which in turn are filled with the toe, then cross. The winner is the first one to collect a series. It is necessary to make a mistake once, and you will immediately give your opponent the victory. Tic-Tac-Toe can be played alone, and there against the artificial intelligence.