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Playstation 2 - Hidden Invasion cheats

Easy mode
Press Up, Down, Down, Up, Left, Left, Up, Right, Right,Up, Up, Up.
at the title screen. The sound will confirm, if the correct code 
is accepted.

Gian heads and bodies for players:
At the title screen, press Left, Left, Up, Up, Right, Right, Down, Down.
The sound will confirm, if the correct code is accepted.

Bouncing objects:
Go to the title screen. 
Rotate the Left Analog-stick clockwise direction at least 4 times. 
The sound will confirm, if the correct code is accepted.