Four modes are built in into the GT4 Prologue: racing, free run, driving school and time attack. The Prologue disk will feature the complete graphics engine and physics engine to be used in the final version of the title and will also include five courses: New York, an Italian city, the Grand Canyon, Tsukuba Circuit and Fuji Speedway.
On top of this is a huge list of cars that includes old favorites, concept cars debuting at the Tokyo Motor Show, and cars set to hit the market next year. Prologue will not have the online battle mode. The online mode will be ready in the final version of Gran Turismo 4.
According to the producer Yamauchi, Prologue is meant to be an introductory course to Gran Turismo. Yamauchi feels that the Gran Turismo series has gotten so complicated that it's daunting to newcomers. Prologue's theme is "Education," with the game featuring a driving school mode in which you play through a board game, learning all the skills required of a pro. This mode will also have challenges for experienced drivers, meaning Prologue is also targeted to advanced players.