It's a Desert World. http://www.mariowiki.com/World_2_(Super_Mario_Bros._2) -- Super Mario Bros 2 (US)'s World 2 was desert themed http://www.mariowiki.com/Desert_Land -- as was Super Mario Bros 3's Desert World http://www.mariowiki.com/World_2_(New_Super_Mario_Bros.) -- New Super Mario Bros? Desert World http://www.mariowiki.com/World_2_(New_Super_Mario_Bros._Wii) -- New Super Mario Bros. Wii? Guess what? OH wait, you already know. http://www.mariowiki.com/World_2_(Super_Mario_3D_Land) -- Oh look it's another.... wait it's NOT a Desert? No, instead the Desert World is World 5 here.. but is this a one off?
Also, what other themes can anyone think of that hasn't been done, or at least rarely?
We have had: Grasslands/Generic Desert Beach/Water Snow Forest Mountains/Cliffs/Caves Clouds Lava/Volcano
What about a Factory-themed world, as in a proper "Donkey Kong Country Returns" type factory, not like a few moving wooden platforms? Or, if it counts as different, a Jungle themed world? Or... I dunno, Farm, City, Town (or anything non-rural/urban), Building Site, Skyscraper, etc.... Yeah, the last two sound quite Donkey Kong Land-ish, right?
Also, what about ... Ship levels? Not AIRships, but normal ships, with nice catchy "shanty"-type music, where the enemies where eye patches and say "arrgh" when you defeat them, like in DKC?
I keep wishing they would turn Mario Kart tracks into Worlds like Vanilla Lake and Rainbow Road. We've never had one full lake world nor a fully rainbow themed world! What about a Mushroom City world or even a world of nothing but mushroom themed platforms, trees, etc. A storm covered world set in a dark, creepy forest??? --- I'm beggin' for Nintendo and Arika to release Endless Ocean 3 on the Wii U!!! Still taking my time with Endless Ocean: Blue World with over 50 hours logged in!