Wiggler's Red Coins
From the Super Mario Wiki
There are several methods to reach the cave. One method requires the player to have the cannon open. If it isn't open, talking to the Bob-omb Buddy where the cannon would be located on Tiny Island will open it. On Huge Island, the player needs to use the cannon to blast to a tree on the cliff side. Once up there, the player has to cross a narrow bridge, which is slightly larger in the DS version, to reach the opening into the cave.
Another alternative method to reach the cave, whilst on Huge Island, is by jumping high and long enough in Windswept Valley from where Koopa the Quick would stand in Rematch with Koopa the Quick to land the cliff which contains the bridge leading to the entrance of the cave. In Super Mario 64 DS, the player can also use Luigi's backflip to reach the entrance.
All of the eight Red Coins are in the cave and are placed on the many platforms. To reach the one on the tallest pillar, the player has to either use Mario's Wall Jump or hang onto the wire grate above and swing over to it. Once all the Red Coins are collected, the Power Star will appear at the Star Marker in between the two pillars.
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