- Optional, one-off races that award a one-time FUEL bonus upon winning (2000 at Offshore Shack, 4000 at all other zones).
- Each Zone has 10 challenges, one of each race type, but unlike career races they're restricted to one specific vehicle.
- Like races, there's no penalty for restarting or quitting, so do so if you have to. Plus, once you beat them, you can re-run them again as many times as you like.
- While races help you unlock new zones & vehicles, challenges help you get the extra FUEL to buy those new vehicles.