About the Bouldermobile
The Bouldermobile is the number 1 car. It is a hollowed-out boulder with stone wheels, but can often take the top spot despite its heavy construction. The Brothers often accelerate by striking it with their clubs, to which the car's engine will respond in kind if it's hit once too often, or by hopping out and pushing. If it breaks, they club a nearby rock to sculpt a new car.