Transformers
Enter these into the main menu.
All missions down, up, left, right, right, right, up, down
Cybertron Missions right, up, up, down, right, left, left
Infinite health left, left, up, left, right, down, right
Infinite ammo up, down, left, right, up, up, down
No traffic or cops right, left, right, left, right, left, right.