Gray Matter Interactive Studios, Inc. was a developer.
Gray Matter Interactive Studios , Inc. was a computer game developer founded in 1994 , and acquired by Activision in January 2002 .. Activision. Activision. computer game developer. computer game developer. Gray Matter used to be known as Xatrix Entertainment , Inc. .. Towards the end of development for Call of Duty  : United Offensive in 2004 , Gray Matter was merged into Treyarch , and the team responsible for titles like Return to Castle Wolfenstein is no longer recognized by that name .. Treyarch. Treyarch. Return to Castle Wolfenstein. Return to Castle Wolfenstein. Some of the Gray Matter team still resides at Treyarch , although its founder and several executives from the former studio have found employment elsewhere .. Treyarch. Treyarch