The Games: Paper and Pencil: (Tic-Tac-Toe Paper and Pencil )

In Tic-Tac-Toe, also known as Noughts and Crosses and Ticktacktoe, two players-- one drawing crosses, the other circles-- alternately make their marks in a 3 by 3 grid-like figure. The object is to be the first to make three in row. Tic-Tac-Toe Paper and Pencil Games.

Because of the simplicity of tic-tac-toe, it is often used as a pedagogical tool for teaching the concepts of good sportsmanship and the branch of artificial intelligence that deals with the searching of game trees. (wikipedia)