Whether you are going for the Nail'd Expert or Nail'd Sniper line both make the game that much more fun and rewarding. Boost can also be obtained when traveling through tunnels or high line burms that allow you to defy gravity at a 90° angle or totally upside down creating the 'looking down on them' 50% boost bonus. There are five different race types. The Simple Race which is a plain race, the first person to cross the finish line is the winner there are no race modifiers involved in this race. http://naildbiter.com/Vj53W