New Super Mario Bros. 2

[Chaoxys]

Honestly, Nintendo could keep using the default worlds if they'd simply think about what these worlds could offer. To give a better example: The water world. What is it usually? A few underwater levels, a few beach levels, the end. Why not throw a level on a ship in the mix (not a doomship, but a cargo ship in the ocean), or a light house that you have to climb up through the inside. Seriously, the current basic worlds have a LOT of potential, but admittedly, Nintendo likes to play it safe.