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Call of Duty is a first-person shooter video game franchise. The series began on Microsoft Windows, and expanded to consoles and handhelds. Several spin-off games have been released. The earlier games in the series are set primarily in World War II, but later games have typically been set in modern times or in futuristic settings. The most recent game, Call of Duty: Black Ops 4, was released on October 12, 2018.
The Call of Duty games are published and owned by Activision. Infinity Ward, Treyarch and Sledgehammer Games develop several of the titles with the release of the studios’ games alternating with each other. Some games have been developed by Gray Matter Interactive, Nokia, Exakt Entertainment, Spark Unlimited, Amaze Entertainment, n-Space, Aspyr, Rebellion Developments, Ideaworks Game Studio, and nStigate Games. The games use a variety of engines, including the id Tech 3, the Treyarch NGL, and the IW engine.