Unlockable Graphical Filters
Having beaten the game on the Brutal difficulty and once you are back to the main title screen, you are able to enter the button sequences below to activate special graphical filters:
Brutal mode filter: up, up, down, down, left, right, left, right, X, O
Hard mode filter: up, up, down, down, L1, R1, L1, R1, X, O
Normal mode filter: up, up, down, down, left, right, left, right, O, X
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