Games all about racing or racing-themed action.
Games focusing on racing with cars, motorcycles or other vehicles not tied to any specific brands or racing sports. These games usually have more casual feel than their licensed counterparts.
Hill Climb Racing 2
Example games: Hill Climb Racing 2, Offroad Outlaws
Car/Motorcycle/other vehicle themed games based on real life brands (cars, racing leagues) or racing sports
CSR Racing 2
Example games: CSR Racing 2, Asphalt 9: Legends