The Transformers Cheats:
Enter the following button codes during the "Difficulty Select" screen to get the desired results:
Alaska Level Complete:
R1, Circle, R1, Square, Left, Left, Right, Left.
Big Head Mode:
Circle, Circle, Circle, Square, L1, L1, L1, L2.
Deep Amazon Level Complete:
Left, Right, Left, Left, Right, R1, R2, Circle.
Earth Level Complete:
R2, R1, L1, L2, Square, Circle, Square, Circle.
Mid-Atlantic Level Complete:
Circle, Square, Circle, Square, Right, Left, Left, Right.
Starship Level Complete:
Left, Left, Right, Circle, Circle, Right, Right, Left.
Turbo Mode:
L1, R2, R2, Square, Square, Square, Square, L1.
And during game:
Infinite Powerlink:
Up, Down, Up, Down, Circle, Square, Square, Circle.
Infinite Stealth:
Up, Up, Down, Down, L1, L2, L1, L2.
Note: Must have convert mini-con equipped.
Kill Any Enemy with One Shot:
Square, Circle, Square, Circle, L1, L1, L2, L1.
All Mini-Cons:
R2, R1, Left, Right, Left, Right, Circle, Square.