luiginumberone

This one is way too complicated to explain here. It would take up a huge amount of space, and is probably already on this site several times in the "Walkthroughs" section. Seeing as there are four walkthroughs and a checklist on the page, just go over there and read it from one of those.

Http://www.supercheats.com/gamecube/supermariosunshinewalkthroughs.htm