From the Super Mario Wiki
Yoshi starts the level on a grassy platform with Ukikis and vines. After passing an area filled with Ukikis and Nep-Enuts, the dinosaur reaches some more vines along with more of the aforementioned enemies. Soon after, the Yoshi reaches the Middle Ring and traverses to the next area which begins with some Huffin' Puffins followed by a hill with Ukikis. The player will need to transform into the Helicopter and find the Yoshi Block in order to enter a nearby door. A Middle Ring and a Submarine power-up are found nearby, the latter needed to pass a water segment filled with enemies. Another door leads to an enemy infested area with a Middle Ring. After bypassing some more enemies and obstacles, Yoshi reaches the goal roulette.
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