Gran Turismo is a PlayStation Portable game 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 originally intended to be an exact port of "Gran Turismo 4", although it also included selected content from later games, such as Circuit Ricardo Tormo from "Tourist Trophy" and new cars such as Chevrolet Corvette (C6), Enzo Ferrari and Nissan GT-R SpecV.