Venom car: 
Collect all silver coins in stunt mode to
unlock the Venom car.

Crusher car: 
Collect 16 gold coins in stunt mode to 
unlock the Crusher car.

Euro LX car:
Collect 24 gold coins in stunt mode to 
unlock the Euro LX car.

GX-2 car: 
Collect 24 gold coins in race mode to 
unlock the GX-2 car.

Mini XS car: 

Collect 36 gold coins in race mode to 
unlock the Mini XS car.

Panther car 

Collect all gold and silver coins in both 
race and stunt modes to unlock the Panther
car.