Hidden Invasion - Platform: Playstation 2

Easy mode
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Quickly press Up, Down(2), Up, Left(2), Up, Right(2), Up(3) 
at the title screen.
A sound will confirm correct code entry.

Big head mode
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Quickly press Left(2), Up(2), Right(2), Down(2) at the title 
screen. A sound will confirm correct code entry.

Oogie Boogie mode
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Quickly rotate the Left Analog-stick counter-clockwise four 
times at the title screen.
A sound will confirm correct code entry. Many objects will be 
bouncing during game play.

Deformed Characters
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At the title screen, press
Left, Left, Up, Up, Right, Right, Down, Down.