Ridge Racer, released in Japan as Ridge Racers, is an arcade racing video game developed by Namco for the PlayStation Portable. It is named after the eponymous Ridge Racer video game series to which it belongs. The game was released in Japan on 11 December 2004, in North America on 24 March 2005, and in Europe and Australia on 1 September as a launch title. Available in the game is a fully playable version of the Namco arcade game New Rally-X. Ridge Racer has been described as a 'compilation' of the series, featuring tracks, cars and remixed soundtrack from previous titles in the 1990s. Ridge Racer was very well received by critics and was praised for its visuals, gameplay and soundtrack. It was re-released in 2005/2006 as a platinum title. A sequel titled Ridge Racer 2 has also been released for the PSP.