Please note VGF's cheat codes have relocated to the main page.
Alter Echo
Remove Display
Up, Up, Down, Down, Left, Right, Left, then hold Back and press Y.
(Thanks to thugnokio@hotmail.com)
Restore Health
Up, Up, Down, Down, Left, Right, Left, then hold Back and press Right.
(Thanks to thugnokio@hotmail.com)
Restore Time Dilation
Up, Up, Down, Down, Left, Right, Left, then hold Back and press Up.
(Thanks to thugnokio@hotmail.com)