Robots cheats and cheat codes for Gamecube

Pause the game play, then quickly press the following buttons.
After entered a codes, you should hear a sound.

Unlimited health:
Up, Right, Down, Up, Left ,Down, Right, Left.

Unlimited scrap:
Down, Down, Left, Up, Up, Right, Up, Down. A

Big head mode:
Down, Down, Up, Right, Right, Left ,Right. A

Butt burning Rodney:
If you slide many times with Rodney, his butt will burn.
This will not harm to Rodney.