井字棋是兩名球員,X和O,誰輪流標誌著空間遊戲
Tic-tac-toe (also known as noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 2×2 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.