Gray Matter Interactive Studios, Inc. was a computer game developer, which was acquired by Activision in January 2002. Gray Matter was previously known as Xatrix Entertainment, Inc. Towards the end of development for Call of Duty 2: Big Red One in 2005, Gray Matter was merged into Treyarch, and the team responsible for titles like Return to Castle Wolfenstein is no longer recognized by that name. Some of the Gray Matter team still resides at Treyarch, although its founder and several executives from the former studio have found employment elsewhere.

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Call of Duty: United Offensive

Call of Duty: United Offensive

First Person Shooter

The war that changed the world rages on, with 13 all-new single-player missions, 11 new multiplayer maps, and more intense action than ever before. Award-winning...

Call of Duty 2: Big Red One

Call of Duty 2: Big Red One

First Person Shooter

The hallmark cinematic intensity of Call of Duty returns with a more complete gameplay experience than ever. Experience a wide variety of missions on...

Kingpin: Life of Crime

Kingpin: Life of Crime

First Person Shooter

Rise to the top of your own gang of thugs, and then take on the street’s top dog, the Kingpin. You wake up in a dumpster only to realize you’re now...

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