Archer Maclean's Mercury Cheats - PSP
Primary Collection of Cheats
Level select
Select two player mode, then enter hg? as your initials. Return to the main menu and start a single player game. At the world selection screen, hold [L] + [R] and press [Select]. All levels will now be unlocked. To lock all levels again, hold [L] + [R] and press [Select] again.