Enter the following at the Main Menu. You'll hear a sound to confirm.
Infinite turbos R2, L1, Square, Triangle, R1, L2, L1, R2
Big tires Square, Triangle, Square, Triangle, R1, R1, L2, L2
Small cars Square, R2, L2, Triangle, Triangle, L2, R2, Square
TowJam car Square, 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
Twinmill 2 Car:
Enter the password TH4T_ROCKS
Thanks to Revolution readers Scott, Martin Brodeur, Jacob Payne, Bryan Hendley,
Nathaniel Metz and Pinky878!