checked-no =>Extra Difficulty Levels: Complete Grand Prix 1-8 to unlock additional difficulty levels for each race. =>Extra Cars: The eight extra cars (00-Agent, Caddy, DS, Galaga 88, Mario Racing, Pooka, Red Shirt Rage, and Shy Guy) can be unlocked in two different ways... * Single Player: Finish all the races in Z/Platinum Cup difficulty to unlock all 8 extra cars. * Multiplayer: Play more than 10 races in multiplayer to start unlocking these extra cars. The DS Car may not be unlockable this way, and may require the completion of Extra Mode Ridge Racer Extreme. =>Car Attack: Twenty additional cars can be unlocked in Car Attack mode. Completing each Grand Prix (1-8) will unlock additional cars in Car Attack. Race and beat the cars in Car Attack to unlock them for your own use. =>Additional Music: Additional music is made available as you collect additional cars in the game. * Galaga Pac Jam: Unlock Pooka. * Mushroom Kingdom II: Unlock DK Racing.