New cars and drivers can be unlocked in several ways.

There are 3 ways to unlock cars:

  1. You can wait for a car challenge to appear in the posters on the main screen; if you come in 1st place, you will win the car.  If you don't come in 1st, you can buy the car for a gem discount or wait for the car challenge to reappear.  Car challenges appear starting at player Level 3.  
  2. You can buy them outright in the Team screen for gems or through in-app  purchase.
  3. You can sometimes win them in Tournaments, accessible through the Event screen.

There are 3 ways to access driver challenges:

  1. You can wait for a driver challenge to appear in the posters on the main screen.  If you beat the driver, they will join your team.  If you don't beat them you can recruit them with gems, or wait for them to challenge you again.  Driver challenges start appearing at player Level 2.
  2. You can buy drivers outright in the Team screen for gems or through in-app purchase.
  3. You can sometimes win them in Tournaments, accessible through the Event screen.