best car racing game ?

Hey , i've been enjoying playing a game in my phone that i found throw a facebook ad called "Highway Traffic Racer HQ " , which has a great graphics , lambo , ferraries ... i want to know which are your favorite car racing game ? i would like to see what others has to offer , thanks
if you where intrested , this is the game i'm talking about :
play.google. com/store/apps/details?id=com.abnstudios.HighwayTrafficRacerHQ