OXO was a computer game developed by Alexander S. Douglas in 1952 for the EDSAC computer, which simulates a game of Noughts and crosses, also sometimes called Tic-tac-toe. OXO is the earliest known game to display visuals on a video monitor. To play OXO, the player would enter input using a rotary telephone controller, and output was displayed on the computer's 35×16 dot matrix cathode ray tube. Each game was played against an artificially intelligent opponent.


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One of the first videogames ever made. The game is unbeatable as it is programmed to always make the best move.

First game thats using RAM, and it's OXO
PC Emulation is a good visualisation

Double u tee eff they stole assets from Bertie ! 1/5 !

Any 1950 game is impressive simply by existing IMO but the fact that there was a different tic tac toe video game before this one makes it less impressive. Still, decent fun for a brief period of time.

Well I played a game and lost. Utilised the Edsac Simulator, a nifty little bit of historical recreation I will say, but very much goes to show how this wasn't intended for the average member of the public to interact with. This was part of a very heavy thesis by a future computer science professor at Cambridge, utilising a device made four years after the end of World War II, and god does it feel like it.

The game-design is awful. The middle space is way too overpowered and the skill ceiling is way too low.