Red Coins in Boo's Big Mouth

Red Coins in Boo’s Big Mouth, also called The Lobby’s Other Secret, is the bonus ninth episode of Sirena Beach in Super Mario Sunshine. It can be accessed by replaying The Hotel Lobby's Secret.

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Re-entering the secret course in said episode will allow Mario to use FLUDD and do a red coin challenge. The Red Switch Plate is placed at the top of the tall wall the player has to Wall Jump up to. Ground Pounding the switch will cause eight red coins to appear in the course, and the player has to collect them all within a time limit of a minute and thirty seconds. Once all the red coins are collected, the Shine Sprite will appear at the end of the course, but failing to collect the red coins within the time limit will result in Mario losing a life. The locations of the red coins are:
 * Above the first set of sand blocks.
 * Two are along the sand block path on the left.
 * One is placed at the end of the block structure.
 * One is located under the ice blocks of the structure. Spraying the blocks with FLUDD will make them evaporate.
 * The final three are located over the sand block pyramid.