Prototype Game Cheats

Prototype Game Cheats
Unlockable: Body Surf

To unlock a new ability called “Body Surf,” navigate to the Cheats menu (under “Extras” in the Main Menu) and enter this code: RIGHT, RIGHT, LEFT, DOWN, UP, UP, UP, DOWN

Unlockable: New Game +

Once you beat Story Mode, you’ll be able to play through it again with all of your powers and upgrades.
Submitted by ProtoMan

Beat the game on Normal to unlock Hard Mode.

Earning a Gold in every event unlocks Platinum Events, which are more difficult. Radical Events can be unlocked in the same manner and are even more difficult.