Polyphony Digital is a Japanese first-party internal video game development studio of Sony Interactive Entertainment, part of Sony Interactive Worldwide Studios. Originally known as Polys Entertainment, after the success of the first Gran Turismo game in Japan, they were granted greater autonomy and their name changed to Polyphony Digital. Polyphony currently has 5 studios in Japan, the Netherlands, and the United States.
The studio is best known for its Gran Turismo racing games. Led by Kazunori Yamauchi, Gran Turismo became the most successful racing series for the PlayStation line of video game consoles. The series is designed to be the ultimate driving simulator, offering realistic driving physics. In 2006, Polyphony released Tourist Trophy, in an attempt to bring the realism of Gran Turismo to motorcycle racing.