World 11-2 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
World 11-2 is the second level of World 11 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS.
Near the start is a ? Block containing a Cape Feather. The Cape will help the player through the level, so much that it is even possible to not enter the sub area. But, the normal path is through the sub area. In the sub area, the player can either go right and get Coins, or risk going left and end up in a star shape area with a 1-Up Mushroom, Koopa Troopas, and a Key. After the path is rejoined, Koopa Paratroopas appear. If the player has a Key, they can fly up an unlock a Key Door to a room filled with Hard Blocks and Pink Coins, where a Spiny Shell is accessed, then the player will take the Warp Door back to the Koopa Paratroopas. After that, the player must past a mountain of Spike Traps and Spike Tops. After this, a Super Mushroom on a Cape Feather before a hall of Jumping Piranha Plants in Pipes above or Monty Moles below, though this can be avoided if the player has a Key. There is a 1-Up Mushroom past the Key Door. After this, an area with Lifts over Spike Traps below and Red Koopa Paratroopas in the way. The third 1-Up Mushroom is above the exit of the sub area, which requires a Cape.