The music tracks can be used for offline or online races. For the first time in the series, the game features the use of custom soundtracks that enables players to play their own songs while racing, but this option must first be unlocked by completing section B or C of the Driving Challenges. There are 45 tracks (including layout variations) plus the added bonus of reverse on most tracks, which takes the track number to 72. The game uses a new trading system to allow players to acquire cars. Gran Turismo is centered on completing driving missions in order to advance in the game, unlike Gran Turismo 4's open-ended map. Rewards such as credits and cars earned based on the difficulty, performance and number of laps they have chosen. The single player menu presents players with three variables: mode (Time Trial, Single Race, and Drift Trial), car, and track selection. The game is centered on an open-ended design. Toyota Supras from the JGTC racing league compete on High Speed Ring On June 1, 2010, the game was re-released as part of Sony's Greatest Hits budget line of video games. As of September 2017, Gran Turismo has sold 4.67 million units, making it one of the best-selling PSP games. It was released on October 1, 2009, as one of the launch titles for the new PSP Go. 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. The game was announced at Sony's E3 press conference on May 11, 2004, alongside the original PSP. Gran Turismo ( グランツーリスモ, Guran Tsūrisumo) is a 2009 racing video game developed by Polyphony Digital and published by Sony Computer Entertainment for the PlayStation Portable.

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