World Flower (New Super Mario Bros. 2)
From the Super Mario Wiki
World Flower (or Flower World) is the second special world and the eighth world appearing in New Super Mario Bros. 2. As in World Mushroom, this world has a generic design, having a background color of green. This is an optional world to completing the first goal of the game (that is, beating Bowser) and serves as an alternative world to World 4. This world can be accessed by completing either World 3- or World Mushroom-.
There are a total of nine levels and three Toad Houses in this world. This world has a total of eleven exits. There are three normal levels, a Ghost House and a Castle on the main path and an additional two levels along with a Warp Cannon which can be found by secret exits in the other levels. The three Toad Houses includes two that are green and one which is red. The boss of this world is Lemmy Koopa, fought at the castle at the end of the world. Defeating him will take the player to World 5. The Warp Cannon in this world takes the player immediately to World 6, thus skipping World 5 as well. Note that a player can skip almost all normal worlds in the game (except World 1 and World 6) by taking the Warp Cannon of every entered world until the battle with Bowser (World 1-, World Mushroom-Warp Cannon and World Flower-).
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