If you want to play the Call of Duty games in chronological order, you should start with Call of Duty: WWII, followed by Call of Duty 4: Modern Warfare, Call of Duty: Modern Warfare 2, Call of Duty: Modern Warfare 3, Call of Duty: Black Ops, Call of Duty: Black Ops II, Call of Duty: Ghosts, Call of Duty: Advanced ...

It is the first installment in the Call of Duty franchise, released on October 29, 2003, for Microsoft Windows.