Tic Tac Toe was originally known as Noughts and Crosses and has been played in the United Kingdom for centuries. The same playing grid used for this game was also found etched into surfaces throughout the ancient Roman Empire, proving its popularity. Even though no playing pieces have been found that confirm this was the same game, the Roman game Terri Lapilli is thought to be an identical game.
Tic Tac Toe is played with two players that take turns placing their chosen piece (a Naught "o" or a Cross "x") on the game board, which is a 3-inch by 3-inch grid. The first player to complete a row either horizontally, vertically, or diagonally is the winner.
Fun Fact: In 1952, Tic Tac Toe was programmed to be played on a computer called EDSAC, which was built at Cambridge University in 1949. It played perfect games against all its human opponents.
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