Hot Wheels Turbo Racing
Enter the following at the Main Menu. You'll hear a sound to confirm.

Infinite turbosR2, L1, Square, Triangle, R1, L2, L1, R2

Big tires Square, Triangle, Square, Triangle, R1, R1, L2, L2

Small carsSquare, R2, L2, Triangle, Triangle, L2, R2, Square

TowJam carSquare, Triangle, L1, R1, L2, R2, Square, Triangle

Weird graphics L1, R1, L2, R2, L1, R1, L2, R2

Weird sounds R2, R1, L2, R2, Square, Triangle, L1, R1