The Rock Mushroom, is an item in Super Mario Galaxy 2. It is a Mushroom with a rocky head. When Mario touches the Power Up, he becomes Rock Mario. His cap and suit are turned into rocks stuck to many other rocks, creating a boulder. Shaking the Wii Remote will enclose Mario into the boulder. Only Mario's head is seen (plus the "M" on his hat). Mario can roll around and jump in this form. He can damage enemies and crystals in this form. However, doing this returns him into Rock Mario. However, all you must do is shake the Wii Remote to return into the boulder. The Rock Mushroom's major role is in Boulder Bowl Galaxy.