The difference is that the characters are in cars. And they fit to each character. I.e. Jazz's car is a groovy bolid with spoilers while Spaz's one is sratchy and weird. Also, Spaz's car is the fastest, but it has big inertia, so it will crash on every curve. Other cars also have their own abilities. Aaaand, when two characters bump each other, they yell in anger ("Get out of my way, idiot!").