From the Super Mario Wiki
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Mario starts on the ground right to a river with a lone Bukubuku. Above him are a pair of Icicles. There are two platforms to the left, the latter having a ladder that is one tile above the ground. The ladder leads to a platform which is right to a set of spiky platforms which are above an Icicle, which are right to a platform, which is right to a set of spiky platforms which have two Icicles and one Ladder above them. Left of these platforms is a platform. Above the ladder is the key which is left of the door.
Pauline's lost items
Within this stage, Pauline's lost items can be found in the following order and in the following places: