World 9-4 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
World 9-4 is the fourth level of World 9 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS.
Even though the style is New Super Mario Bros. U, this level is based on World 2-5 from Super Mario Bros. 3. Like 2-5 Remix (Chain Chomps) from Super Mario Maker, Chain Chomps are now huge and a Hard Blocks blocking a pipe, which, in this version, holds a "boss" of Goombas on top of a Big Koopa Troopa with a POW Block and 1-Up Mushroom blocked by Hard Blocks. Another area is found above, which leads to a bonus room. In the bonus room are four Bull's-Eye Blasters shooting Coins and two 1-Up Mushrooms in Junior Clown Cars. Even though Super Leaves do not appear in the New Super Mario Bros. U style, if the style is changed in edit, they would appear, as Propeller Mushrooms replace them.