Gran Turismo

is a 2009 racing video game developed by Polyphony Digital and published by Sony Computer Entertainment for the PlayStation Portable. The game was announced at Sony's E3 press conference on May 11, 2004, alongside the original PSP. Following five years of delays and speculation, during which it was variously known as Gran Turismo Portable, Gran Turismo 4 Mobile, Gran Turismo 5 Mobile and Gran Turismo 4.5, it made a reappearance at E3 on June 2, 2009, in playable form. It was released on October 1, 2009, as one of the launch titles for the new PSP Go. As of September 2017, Gran Turismo has sold 4.67 million units, making it one of the best-selling PSP games. On June 1, 2010, the game was re-released as part of Sony's Greatest Hits budget line of video games.