<Tr> <Th> Type </Th> <Td> Game engine </Td> </Tr> <Tr> <Th> License </Th> <Td> Proprietary </Td> </Tr> <P> The IW engine is a game engine developed by Infinity Ward, Treyarch, and Sledgehammer Games for the Call of Duty series . The engine was originally based on id Tech 3 as its core, since the engine itself is proprietary with inclusion of GtkRadiant by id Software . It has been used by Infinity Ward, Treyarch, Raven Software and Sledgehammer Games . </P> <P> The engine has been distinct from the id Tech 3 engine on which it is based since Call of Duty 2 in 2005 . The engine's name was not publicized until IGN was told at the E3 2009 by the studio that Call of Duty: Modern Warfare 2 would run on the "IW 4.0 engine". Development of the engine and the Call of Duty games has resulted in inclusion of advanced graphical features while maintaining an average of 60 frames per second on the consoles and PC . </P>

What engine does call of duty run on