From the Super Mario Wiki, the Mario encyclopedia
Yoshi starts the level in a snowy area with some miniature planets with their own gravity, Ravens walks around these planets within its gravity. Eventually, Yoshi reaches the Checkpoint Ring followed by some more moving platforms and an entrance to the next area which contains a beanstalk and some clouds. Yoshi needs to get the nearby key and use it at the locked door to enter an area with a Checkpoint Ring, some more planets, and the Goal Ring.
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