Unlock cars:
Zotic: Win 1st place in the Buccaneer Bay challenge.
The Gov'ner: Win 1st place in all six Game Show mode challenges.
Switchback: Win 1st place in the Lava Land challenge.
Super Tuned: Win 1st place in the Spider Alley challenge.
Rodger Dodger: Win 1st place in the Zero Gravity Zone challenge.
Pony-Up: Win 1st place in the Jurassic Jam challenge.
HW Prototype 12: Win 1st place in the Tiki Island challenge.
All rims unlocked: Win 1st place in all races.
24 carat gold car with gold rims: Complete all six areas.
Vulture: Reach at least 2nd place in the Jurassic Jam challenge.
Power Pipes: Reach at least 2nd place in the Lava Land episod.
Overbored: Reach at least 2nd place in the Buccaneer Bay challenge.
Muscle Tone: Reach at least 2nd place in the Tiki Island challenge.
MS-T Suzuka: Reach at least 2nd place in the Spider Alley challenge.
Jester: Reach at least 2nd place in the Zero Gravity Zone challenge.

Unlock Bonus wheel rims:
     Win the indicated race to unlock the corresponding wheel rims.

Rim 15   Win 1st place on the Volcano Battle race 
         in the Lava Land TM
Rim 14   Win 1st place on the Fire Mountain race 
         in the Lava Land TM
Rim 13   Win 1st place on the Satellite Mission race 
         in the Zero Gravity zone TM
Rim 12   Win 1st place on the Solar Strip race 
         in the Zero Gravity Zone TM
Rim 11   Win 1st place on the Gator Forest race 
         in the Tiki Island TM
Rim 10   Win 1st place on the Jungle Snake Pit race 
         in the Tiki Island TM
Rim 9    Win 1st place on the Monster of the Deep race 
         in the Buccaneers bay TM
Rim 8    Win 1st place on the Whiteskull Cliffs race 
         in the Buccaneers bay TM
Rim 7    Win 1st place on the Insect Hive race 
         in the Spider Alley TM
Rim 6    Win 1st place on the Black Widows Nest race 
         in the Spider Alley TM
Rim 5    Win 1st place on the Dinosaur Boneyard race 
         in the Jurassic Jam TM
Rim 4    Win 1st place on the Terror Saur race 
         in the Jurassic Jam TM

Faster speed:
     Whenever  you go on a ramp, flip your car forwards by pressing Up
to increase your speed.