During gameplay enter the following codes
Press Up, Up, Down, Down, Left, Right, Left, Left, Right Trigger, Left Trigger.
Unlock Big Head Mode:
Press Up, Left, Down, Left, Down, Up, Up, Left.
Unlock Disco Mode:
Press Left Trigger, Left, Left Trigger, Left, Right Trigger, Right, Right Trigger, Right.
Unlock Low Gravity:
Press Up, Up ,Up, Up, Up, Up, Down, Right, Up.
Unlock Level Select:
Beat the game twice to unlock the 'Level Select' option
Added by: Sanzano Jan 31st 2006, ID#5290