For example, Call of Duty: United Offensive is an expansion for the first game, while Call of Duty: Finest Hour and Call of Duty 2: Big Red One are side stories of the first two entries. However, things get complicated when you add all the expansions, online experiences, mobile games, and spin-offs. If we consider only the main entries with single-player campaigns, including all the World War II titles, the Modern Warfare suubseries (plus its reboot), and the Black Ops subseries, there are 19 video games in the franchise.
Due to quite a few subseries, a reboot, and the many studios that have worked or are working in the series, it can be a bit troublesome to determine how many Call of Duty games have been released.
