If you want to play the CoD games in the order they came out, this is the order you'll want to follow: Call of Duty (2003) Call of Duty: United Offensive (2004) Call of Duty: Finest Hour (2004) Call of Duty 2 (2005) Call of Duty 2: Big Red One (2005) Call of Duty 2 (Mobile) (2006) Call of Duty 3 (2006)