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