Pickax Cave Plummet
From the Super Mario Wiki
Captain Toad starts at the top of the course. He can either go to the body of water in one corner and get the first Super Gem with the Super Pickax or enter the cave next to it that has a Pluck Patch near it. Captain Toad should descend down the cave in order to continue. From there, he can use the Pickax to defeat enemies and destroy the Rock Blocks in the cave. Should he lose the Pickax, he can receive another Pickax in a Pluck Patch or by defeating a Piranha Sprout. At the bottom of the cave is where the Power Star awaits on top of a pile of noncollectable Coins.
The Pixel Toad is under the block holding the blue switch underwater near the starting area.
An 8-bit Luigi is behind the rock to the left of the wall of Rock Blocks at the top of the level.
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