Mario Forever v6.0 - World of Stupidity (completed?)

Let's celebrate April Fools' day with a walkthrough of a perfect-themed world, which is laughing and kidding at us since its release.
But now, I'm laughing at you "I mean at World of Stupidity", because I've completed it!
In your face! "I mean always at World of Stupidity"
Mario Forever is a fan game made by Buziol Games.
Mario and all relatives are developed by Nintendo®.