Archer Maclean's Mercury Cheats for PSP

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.

Place first in every high score board on every stage to unlock their world's respective bonus stages.

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Archer Maclean's Mercury Items