X NuonUnlock all Levels and Extras: At the Chapter Select Screen, Hold the Back button and press Right, Right, Left, Left, X, X. More Call of Duty 3 Cheats Call of Duty 3 Call of Duty 3 - Unlock all Levels and Extras Call of Duty 3 - Unlock all Levels and Extras Call of Duty 3 - Unlock all levels and bonus content Call Of Duty 3 - Hold Extra Grenades » More Cheats April 10, 2009 - 11:06am