Gran Turismo 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 was finally confirmed for an October 1, 2009 release date, and was a launch title for the PSP Go. The game was intended to be a port of Gran Turismo 4.