Tic Tac Toe

Make three in a row against a friend or an unbeatable computer opponent.

Your turn. Place X.

Opponent

You play X. The computer plays O.

Rules and details

Rules

X takes the first turn, followed by O.
Select one empty square on each turn.
The first player to place three marks in a horizontal, vertical, or diagonal line wins.
If all nine squares are filled without a line, the round is a draw.

Game modes

Vs computer: you play X against a local minimax opponent that cannot be beaten.
Two players: X and O take turns on the same device.

Three-in-a-row games have existed in many forms for centuries. Tic Tac Toe also holds a place in computing history: Alexander Douglas created OXO for Cambridge University's EDSAC computer in 1952, making it one of the earliest computer games.

Source: Computer History Museum.

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