The following bonuses can be unlocked during game play by doing
well and getting points.
AI Vengeance: AI cars retaliate when hit.
Front Wheel Drive: Car has front wheel drive.
Hardcore Physics: Hardcore realism.
Horn Ball: Press Up to shoot a paintball.
Horn Mortar: Press Up to shoot an explosive mortar.
Insane Racecar: Press Up to jump.
Mini Cars: Smaller cars
Monster Cars: High suspension.
Oh Dear: One car on track replaced by monstrous-sized crew member.
Super Draft: Faster draft speed.
After you pass the start/finish line, instead of turning drive
straight for the upper right part of the wall. You then should be
able to drive past the parked cars and trailers, and exit the
other side back out on the race track.