|gameinfo = Ace Combat Zero's gameplay is split into a single-player campaign mode and a two-player versus mode. The mechanics themselves are a mix of features from Ace Combat 4 and 5.
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The game takes place in 1995, 15 years before the events of Ace Combat 5: The Unsung War, revolving around the conflict between the nation of Belka and the Allied Forces - a coalition of military forces from the Osean Federation, the Union of Yuktobanian Republics, the Kingdom of Sapin and the Republic of Ustio, which was formerly part of Belka.