World Flower (Super Mario 3D World)
From the Super Mario Wiki
World Flower (called Flower World on Miiverse) is the third special world and the eleventh world in Super Mario 3D World. It is unlocked after clearing Broken Blue Bully Belt in World Mushroom. This world sits adjacent to World Mushroom, and consists of remixes of previous courses. World Flower contains twelve standard courses, the most of any world in the Mario franchise, along with World 3 of Paper Mario: Sticker Star.
This is the only world in the game to not have a Captain Toad's Adventures course, a Mystery House, or any other special kind of level. This is also the only world that is not first accessed via a Clear Pipe or rocket ship.