Here are some cheats and tips for the game Grand Prix Challenge.
Cheat mode:
Set a record lap time one any track. Then, enter one of the
following names at the lap record entry screen.
All tracks:
Enter “TEAMPEEP” as a lap record name.
All Grand Prix Challenges:
Enter “IMHRACING” as a lap record name.
Ace difficulty setting:
Enter “REDJOCKS” as a lap record name.