From the Super Mario Wiki
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Inside, Mario and Luigi play the Chuckorock Bounce minigame, known as "Chuckola Bounce". After completing it, they are awarded the Winkle Card, which is used to get past the Winkle guard and access a piece of the fallen Beanstar. In deeper parts of the forest, there is even a Winkle statue.
In Mario & Luigi: Superstar Saga + Bowser's Minions, the Winkle that explains the minigame and acts as a timer is somewhat replaced by an orange Winkle.
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