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1[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/oxo_9602.jpg]]
2''OXO'' (or ''Noughts and Crosses'') is a player vs. computer TabletopGame/TicTacToe game which was written by Alexander S. Douglas in 1952 for the [[UsefulNotes/MainframesAndMinicomputers one-of-a-kind EDSAC computer]] at the University Of Cambridge. The single-player "game" was designed for academic purposes — Douglas used ''OXO'' on the famous EDSAC to study the "Interactions Between Human and Computer".
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4''OXO'' was the one of the first digital graphical games to run on a computer, and was rather simple to use — the player played against the computer, with output displayed on the computer's 35×16-pixel cathode ray tube. The source code was short, yet played a perfect game of noughts and crosses. There is contention if it was the first digital graphical game. Another game, written by Christopher Strachey, created a version of draughts, was also run on the EDSAC in the summer of 1952. While the date that Strachey ran his program was documented, it is unclear when OXO was first played, so it is unknown which one predated the other.
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6!!This game provides examples of:
7* MatchThreeGame: You have to line three naughts or crosses up.
8* NoPlotNoProblem: As it's only a simple tic-tac-toe game released in the 1950s, the plot is nonexistent.
9* UnwinnableByDesign: The computer never loses.
10* UrExample: Depending on how you define a VideoGame, this may be the first one ever, if you consider 1947's ''VideoGame/CathodeRayTubeAmusementDevice'' too simple and/or disqualified for lack of evidence of practical implementation. The next possibility is either the above-mentioned draughts game or ''VideoGame/TennisForTwo''.

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