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Sledgehammer Games built — then scrapped — a Halo multiplayer prototype

Sledgehammer Games, the Activision studio behind Call of Duty: WWII, Vanguard and Modern Warfare 3, developed a multiplayer prototype for Halo. Xbox engaged Sledgehammer to explore the project, but the prototype was ultimately cancelled. The effort is notable because a studio known for Call of Duty was tapped to work on Halo multiplayer.