From the Super Mario Wiki
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Near the start of the level, there is a Semi-Solid Platform with a ? Block containing a Yoshi Egg. Since there is hardly any ground, the player needs to use Lifts and Hard Block on tracks. The path then diverges. The top path taken by quickly climbing up Flimsy Lifts contains a Spiny Shell surrounded by ground and three 1-Up Mushrooms that can be gotten if the player destroys the Hard Blocks surrounding them. A blue Lava Lift can take the player down while collecting coins with Yoshi's tongue due to Hard Blocks. The bottom path contains a Flimsy Lift on tracks. Either way, the player ends up on Mushroom Platform below Flimsy Lifts. The path diverges again. The top path has a ? Block containing a Super Mushroom, but it can't be taken unless the player has a Spiny Shell at the beginning and end. The player needs Yoshi due to the Munchers. Two Wigglers also are here. The bottom path just has ground, but has three Wigglers. After some Lifts, the player can reach the Giant Gate by going on Hard Blocks on tracks while avoiding or jumping on the Koopa Paratroopas.