Gran Turismo ( Gran Turismo PSP in North America ) is a racing game for the PlayStation Portable that was developed by Polyphony Digital. The game was announced at the E3 Sony press conference on May 11, 2004, the same conference where Sony announced the PlayStation Portable. It has since been delayed repeatedly and its completion has been pushed back. At E3 2009, Gran Turismo PSP was finally confirmed for an October 1, 2009 date, and was launch title for the PSP Go. The game was intended to be an exact port of the PlayStation 2 game, Gran Turismo 4, although it could include cars from the PlayStation 3 game, Gran Turismo 5 Prologue, and cars to be featured in Gran Turismo 5.