What is xxxo?

XXXO is a game typically played on paper with two players. It is known by several different names, including Tic-Tac-Toe, Noughts and Crosses, or Xs and Os.

The game is played on a 3x3 grid. One player uses "X" and the other uses "O". Players take turns placing their mark in an empty square. The goal is to be the first player to get three of your marks in a row horizontally, vertically, or diagonally. If all squares are filled and no player has three in a row, the game is a draw (also sometimes called a cat's game).

The game is very simple and a perfect game will always result in a draw if both players play optimally. Despite its simplicity, XXXO can be used as a teaching tool for introducing concepts such as game theory and strategy.