Here I go,
Three jolly butcher boys,
All in a row!
An early variant of Tic-tac-toe was played in the Roman Empire, but an even older variant could originate back to ancient Egypt. It is also the oldest graphical computer game (1952).
How to play
Tic-tac-toe, also called noughts and crosses, or Xs and Os, is a pencil-and-paper game for two players. Players alternate placing pieces, X for the first player, O for the second, on a board. The first player to get three pieces in a row (vertically, horizontally, or diagonally) is the winner.