Purple Coins by the Seaside
From the Super Mario Wiki
Purple Coins by the Seaside is the fifth mission of the Sea Slide Galaxy in Super Mario Galaxy. Until its completion, this mission can only be played while a Purple Comet is in orbit. This Purple Coin mission does not have a time limit.
One hundred Purple Coins are placed throughout the main planet of the Sea Slide Galaxy. To collect them all, the player has to use Bee Mushroom power-ups to reach the ones up high and on clouds. Additionally, none of the Purple Coins are located in the water or in the center island. Once all one hundred of the Purple Coins are collected, the Power Star will appear.
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