Let's stat with selecting the car you want to rumble with, you only have a small amount of money to do some upgrades with. When you complete one challenge, you will be able to buy a newer and heavier car, that will have more destruction power. You can spend the rewards on some upgrades like extra mass for the the cars body, speed, acceleration and shield, to protect yourself when another vehicle is hunting you. Also with the points collected you will be able to get extra stuff, for example reparation, power-ups when close to collision, mines, extra speed and armor.