Unlock Bonus Bowl and Track:
Win all Races and Destruction Bowls in Single Races.
Unlock Brennan:
Defeat Brennan on the Refinery stage to make him playable.
Unlock Rough Justice and Bonus Cars 1, 2, and 3:
Get first place on all arenas in Destruction Derby Mode.
Unlock The Dam and Bonus Cars 4 and 5:
Get 1st place on all of the tracks in Wrecking Race Mode.