If a track doesn't have walls, like one set in the Grand Canyon, then an invisible barrier prevents you from going off track". The Japanese and Asian versions feature songs. An obvious one is how the Opel Speedster in the American version is also known as the Vauxhall VX elsewhere; however the PAL version of the game features the car under both names. Generally, a win using a car with less of an advantage over the AI opponents is worth more points. Originally planned for a release, Gran Turismo 4 was delayed for over a year and a half by Polyphony Digital, and had its online mode removed.
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