Call of Duty: Warzone was a 2020 free-to-play battle royale first-person shooter game developed by Raven Software and Infinity Ward and published by Activision. It was released on March 10, 2020, for PlayStation 4, Windows, and Xbox One as part of Call of Duty: Modern Warfare (2019) and was subsequently connected to Call of Duty: Black Ops Cold War (2020) and Call of Duty: Vanguard (2021), but did not require purchase of any of the aforementioned titles. Warzone allowed online multiplayer combat among 150 players and featured both cross-platform play and cross-platform progression between the three aforementioned titles.