《OXO》係亞歷山大·S·道格拉斯（英文：Sandy Douglas）喺1952年整嘅井字過三關電子遊戲。佢係好早期嘅電子遊戲。遊戲係道格拉斯為咗劍橋大學人機互動課題而開發嘅。
"OXO" is Alexander · · Douglas (English: Sandy Douglas) in 1952 whole tic-tac-toe three-level video game. He was very early in video games. The game was developed by Douglas for the University of Cambridge Human-Computer Interaction project.