From the Super Mario Wiki, the Mario encyclopedia
Yoshi starts the level in a forest with some moving platforms, pipes, and enemies, with a pipe nearby. The pipe leads to another area which contains more enemies and platforms, and eventually the Checkpoint Ring along with a Whirly Gate. It transforms Yoshi into Mine-Cart Yoshi, which must complete the obstacle course in order for Yoshi to continue. After navigating past some more enemies and obstacles, Yoshi reaches the Goal Ring.
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