Fuji and Clover tracks: Complete the Sport Series week two.
Oval track:             Complete the Heavy Series week two.
California track:       Complete the California Cup week five.
Mirrored series tracks: Choose practice mode and select the
                        mirrored version of any track. Once on
                        the track, exit and begin a race in series
                        mode. The series track will be the mirrored
                        version.
Five-Oh car:            Complete the Sport Series.
Predator car:           Use the Five-Oh car to complete the Sport Series.
Mano car:               Use the Predator car to complete the Sport Series.
Squirrel car:           Complete the Light Series.
Mountain Dew pickup:    Complete the Heavy Series.
Insect car:             Use the Squirrel car to complete the Light Series.
Forklift car:           Use the Insect car to complete the Light Series.
Semi truck:             Complete the California Cup
OL' truck:              Use the Mountain Dew pickup to complete the
                        Heavy Series.
Camper truck:           Use the OL' truck to complete the Heavy Series.


ADJUST FOG COLOR:
Select a non-series race.
Hold L + R + C-UP + C-DOWN + C-LEFT + C-RIGHT + DOWN when the
screen fades and wait until the track select screen has fully
appeared. Then, press RIGHT until an option to adjust the fog
color appears.