Call of Duty: Black Ops 4 is a 2018 multiplayer first-person shooter developed by Treyarch and published by Activision. It was released worldwide for PlayStation 4, Windows, and Xbox One on October 12, 2018. It is a prequel to the 2015 game Call of Duty: Black Ops III, the fifth entry in the Black Ops sub-series, and the 15th installment in the Call of Duty series overall.

Call of Duty: Black Ops III is a 2015 first-person shooter game developed by Treyarch and published by Activision. It is the twelfth entry in the Call of Duty series and the sequel to the 2012 video game Call of Duty: Black Ops II. It was released on PlayStation 4, Windows, and Xbox One on November 6, 2015. A feature-limited version developed by Beenox and Mercenary Technology that only supports multiplayer modes was released on PlayStation 3 and Xbox 360 and was also the final Call of Duty title released on those platforms.