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Beanstone are items that Mario and Luigi find in Mario & Luigi: Superstar Saga. They are the treasures of the ancient and long-forgotten Soybean Civilization. They start to appear in pre-selected spots of the Beanbean Castle Town after talking to a Beanbean scholar who happens to be Fava's brother. If all ten of them are collected and given to the scholar, he will give Mario and Luigi a Bros. Rock badge. After the second invasion of the Beanbean Castle Town caused by Bowletta, this sidequest is not open.
In Mario & Luigi: Superstar Saga + Bowser's Minions, Beanstones flash multiple different colors when collected, though they are always green when in the inventory.
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