From the Super Mario Wiki
Yoshi starts the level in a cave with some enemies and a pink door which leads to an area with a Mega Kantera and a Tetu Kantera, either of which can be swallowed in order for Yoshi to clear the spike path. A door leads back outside to a Checkpoint Ring and an area with more enemies and a Thunder Lakitu which tracks the Yoshi. Eventually, Yoshi reaches the Goal Ring.
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