GRID
Enter the “Options” menu, select the “Cheat Codes” option, then enter one
of the following codes. An “X” will appear next to that cheat’s name. You
can then activate the cheat by using the touch screen to place a checkmark
next to it, then press A.
All bonuses – Enter “233558″ as a code. Win a race to unlock everything.
Drift master – Enter “789520″ as a code.
Perfect grip – Enter “831782″ as a code.
Invincibility – Enter “161650″ as a code.
Ghost car – Enter “657346″ as a code.
Toy cars – Enter “592014″ as a code.
High Roller mode – Enter “401134″ as a code.
MM mode – Enter “800813″ as a code.