Like anything in our life, we need to be competitive. And this also applies to racing as you need to finish the race as fast as you can. Not only you need to finish the race, but you also need to defeat some of your opponents if not all. That is what a race is.
In this game, the idea is to drive your car as fast as you can and you need to cross the finish line three times. You need to get at least the third spot for you to unlock a new level. You will get the prize reward base on your position on the race. When you get have enough money to buy a better car, you need to buy a new one since you won't win a race if you are using an old model.