Overall, there are 17 main-series games in the Call of Duty series. There's also Call of Duty: Warzone, a battle royale spin-off with canonical elements. COD: Black Ops: Declassified is a PS Vita-exclusive and a spin-off set between Black Ops and Black Ops 2. Call of Duty: World at War - Final Fronts, for example, is a downgraded version of World at War for the PS2 with an original campaign. There are plenty of spin-offs in the COD universe, as well as ports for less powerful systems that significantly change up their mainline counterparts' stories and gameplay. Call Of Duty's Main Series Games & Spin-Offs, Explained In the last five years, these three developers have rotated, with one main-series game being released every year. Infinity Ward came back for COD 4: Modern Warfare, which began a cycle that saw both developers switch off producing games. That cycle continued until 2014's Call of Duty: Advanced Warfare, which was developed by Sledgehammer Games. Infinity Ward developed the original COD and its sequel, and Treyarch came on for Call of Duty 2: Big Red One, an side-story for the second COD. Treyarch then hung around to develop the standalone Call of Duty 3. The key difference between the Black Ops and Warfare subseries are their developers. Related: COD: Black Ops Cold War Season 1 Trailer Sets Up Post-Campaign Story Finally, there's the Black Ops series, which was actually kicked off by Call of Duty: World At War and continued on to COD: Black Ops 1-4 and Cold War. From there, Call of Duty 4: Modern Warfare begins a separate subseries, in which each game has ' Warfare' in the title - Advanced Warfare, Infinite Warfare, Modern Warfare 2, etc. The Call of Duty games can be broken down into three subseries: The first three games, Call of Duty 1-3, make up the first set.

The games originally started as World War II-era shooters before moving into modern and even futuristic settings. There are also more than a dozen spin-off titles and altered ports that add depth to the first-person shooter series. The COD franchise made over $3 billion in the last year, and there are currently 17 games in the main COD franchise, from Call of Duty (2003) to Call of Duty: Black Ops - Cold War. Call of Duty might be the most well-established video game series of all time.

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