there is an additional "S" class that opens up when you beat the 3 normal classes. i went through the lowest class in one sitting lol
but i would not have spent the money on it if i had known the shortcomings... i didn't buy a PS2 and so didn't know that the prologue games aren't just missing some cars but are also missing a lot of features compared to the full game. i definitely recommend renting this one before buying it... there is no damage modeling (will there be ine th final game?), you cannot buy upgrades for teh cars, car tuning is rudimentary and only available after you have completed the "C" class (the lowest), only a few tracks that get old fast, lousy multiplayer options, and it just feels kinda "rough" around the edges. i also hate that sony insisted on not making every wheel compatible with it, i have a nice force-feedback wheel from logitech but it's the "wrong" model so it won't work. given that they could have just included general support for all wheels (like in windows where you calibrate it before use) this is really stupid of them. i guess they wanna help logitech sell more of the newer wheels, but i'm not made of money... i'll wait til the real GT5 comes out to buy a new one, and then only if there are good online options included.