OXO was a computer game, written for the EDSAC computer, in 1951. Two alternate titles for the game, were Noughts & Crosses(UK) and Tic-tac-toe(USA). It was developed by Alexander S. Douglas. It was the first video game to use a computer opponent.
The gameplay is pretty generic. Basicly just being Tic-tac-toe as an electric game. The player played the game using a rotary telephone controller.
The game was not popular since the EDSAC was exclusive, to the University of Camebridge.