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The Gray Rock is an obstacle in Mario & Luigi: Superstar Saga. They are found throughout the Beanbean Kingdom, serving as roadblocks for Mario and Luigi.

In Mario & Luigi: Superstar Saga/Bowser's Minions

They can be destroyed by Super Hammers and Ultra Hammers. (which are forged by the Hammerhead Bros. at their home in the Beanbean Castle outskirts), but not regular hammers. A Gray Rock blocks the enterance to Teehee Valley, and must be destroyed to pass through.