It is a sequel to 2024's Modern Warfare II, serving as the third entry in the rebooted Modern Warfare sub-series and the twentieth installment in the overall Call of Duty series. The game was released on November 10, 2024, for PlayStation 4, PlayStation 5, Windows, Xbox One, and Xbox Series X/S.
Yes, Call of Duty: Modern Warfare 3 has full cross-platform support. This means that you can squad up with players on any console PlayStation, Xbox, or PC and enter the battlefield together.