All levels:- Go to the options menu, go to "Change Name", and enter
XOPENSEZ.
Custom corvette mode:- Win all C3 career mode races.
Route 66 Checkpoint Mode:- Win all C5 career mode races to unlock
this race mode.
Circuit Endurance Mode:- Win all the C4 career mode races to unlock
this race mode.
Hot Lap Challenge Mode:- Win all the C2 career mode races to unlock
this race mode.
Custom Corvette Mode:- To get custom corvette mode, you have to win
all the races in C3 career mode.