Success will also lead to an increased driver level, with credits, (free or discounted) cars and driving gear being up for grabs as a reward for each level up. (eggplante.com)
It's also just as rewarding as killing a Mega Man boss in it's own way. (bitcultures.com)
[30] The high number of quests in each location was popular, as well as the rewards for completing them. (en.wikipedia.org)