More courses:
Hold X + Y at the options screen. Select the "Password" option that will appear.
Enter one of the following case-sensitive passwords to unlock an additional
course:
Enter CinqueValvole to unlock the Fiorano course.

Enter LiebeFrauMilch to unlock the Nurburgring course.
Enter Stars&Stripes to unlock the Laguna-Seca course.
Enter KualaLumpur to unlock the Sepang course.

Enter DaysofThunder to unlock the Atlanta course.