From the Super Mario Wiki
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In this level, the Spike Bass returns. Mario must jump onto the wooden logs, some of which fall when stepped on, while avoiding the Spike Bass and jumping Cheep-Cheeps. The first Star Coin is found by going under the logs into the water, then jumping onto the Star Coin. The second Star Coin is obtained in the same way. Mario can get the last Star Coin by going through a red Warp Pipe near the end of the level. After the final Star Coin is the flagpole.