From the Super Mario Wiki
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Mario begins on land with two Fuzzies in gaps on the floor. There is a hole which Mario must drop down, taking him into a cave underground which is full of stalagmites and stalactites. The cave is full of Fuzzies, Brick Blocks and POW Blocks, where Mario can find a Fire Flower from early in the level. After passing some more Fuzzies and stalactites, the Checkpoint Flag can be found. Following that are moving yellow platforms on tracks, where several Fuzzies also lie. More platforms can be found along with more Fuzzies and finally the exit pipe. Back in the overworld, there are several narrow cliffs between Fuzzies, and at the end is the Goal Pole.