道格拉斯用EDSAC模擬井字過三關（又叫「圓與叉」） 遊戲，並用屏幕顯示遊戲狀態。同其他早期電子遊戲一樣，道格拉斯完成任務之後就拋棄咗個遊戲。道格拉斯除咗「圈與叉」之外無為遊戲改名；幾十年後，電腦史學家馬丁·坎貝爾-凱利製作EDSAC模擬文件嘅時候，第一次用「OXO」呢個名。喺《OXO》完成嘅差唔多同時，克里斯托弗·斯特雷奇加強咗1951年編寫嘅初版西方跳棋程式，並移植佢到Ferranti Mark 1上面，用顯像管顯示遊戲狀態。《OXO》同斯特雷奇嘅西洋跳棋係已知最早用電子屏幕顯示圖片嘅遊戲，但兩個邊個先就唔知。《OXO》喺電腦設備上運行並顯示圖像，按部分定義係最早嘅電子遊戲，但亦都有定義要求有圖像活動或者連續更新，《OXO》就唔滿足標準。
Douglas used EDSAC to simulate a tic-tac-toe game (also known as "circle and fork") and used the screen to display the game status. As with other early video games, Douglas abandoned the game when he completed his mission. Douglas didn't name the game other than "circles and forks"; decades later, computer historian Martin · Campbell-Kelly first used the name "OXO" when he made the EDSAC simulation. At about the same time as OXO was completed, Christopher · Streich enhanced the original Western checkers program he had written in 1951 and transplanted it to the Ferranti Mark 1 to display the game state with a picture tube. OXO and Streich's Checkers were the first known games to display pictures on an electronic screen, but neither of the two is known. OXO runs on a computer device and displays graphics, and is by some definition the earliest video game, but there are definitions that require graphical activity or continuous updates, and OXO does not meet the criteria.