Polyphony Digital Inc. is a subsidiary of Sony Computer Entertainment Inc., and is a software developer entity. Originally a development group within Sony Computer Entertainment, the creators of “Gran Turismo ” established Polyphony Digital Inc. in 1998.

Cumulative sales of PlayStation® software titles developed by Polyphony Digital Inc. have exceeded 47.54 million units worldwide (as of September 2007) across the “Gran Turismo” series and a new franchise “Tourist Trophy”.