Click on the dog tags in the mission room, then type "mia cheats".
Press [F1] at the indicated screen, then enter one of the following codes to activate the corresponding cheat function:
|Mission select||Mission room||mia level|
|All medals||Mission room||mia medal full|
|Mission completed||While playing the game||mia complete|
|Invincibility||While playing the game||mia dog|