World 3-2 (Super Mario 3D Land)
From the Super Mario Wiki
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Mario will start in front of a lake, and he must dive in the water. Underwater, Mario will find a Cheep Cheep swimming around a Warp Pipe, which will lead him back to the surface. Mario will find a P-Switch here, which will form a trail of coins leading to the bottom of the water. Here, he'll find a Fire Flower, some Crates, a Cheep Cheep, and a Timer above the water. Progressing through the lake, Mario will find several Yellow Rings that give him five coins, along with a ? Block, some Brick Blocks, and a Red Ring right above a pit. He'll also find three Cheep Cheeps patrolling an area. After this, Mario will be able to jump out of the water, following the path to a Checkpoint Flag, and then diving again. Here, Mario can press a P-Switch to cause several Yellow Rings to appear. He'll also have to dodge Porcupuffers swimming between small fences. Not only Porcupuffers will try to harm Mario here, but a Spike Eel will also give a challenge to the plumber. Right after the eel, Mario will find a Pipe, leading to the Goal Pole.