From the Super Mario Wiki
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The level is a slow autoscroll level. Near the beginning are two Mushroom Platforms with a Red Koopa Troopa and a ? Block containing a Super Mushroom above the first one. After a bit, the player encounters Note Blocks followed by Trampolines. Then the player goes through a short up and down section with two Rocky Wrenches on Brick Blocks, the Cannons, a ? Block containing a Super Mushroom and the other Red Koopa Troopa. After three more Rocky Wrenches, the player bounces on Trampolines and encounters a ? Block containing a 1-Up Mushroom before the Goal.