Tic-tac-toe

Tic-tac-toe (American English), noughts and crosses (Commonwealth English), or Xs and Os (Canadian or Irish English) is a paper-and-pencil game for two players who take turns marking the spaces in a three-by-three grid, one with Xs and the other with Os. A player wins when they mark all three spaces of a row, column, or diagonal of the grid, whereupon they traditionally draw a line through those three marks to indicate the win. It is a solved game, with a forced draw assuming best play from both players.

1952 video game: naughts and crosses simulator

1950 video game

twist to the original game tic-tac-toe

board game

abstract strategy board game, generally for two players

educational game about quantum mechanics