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The Rainbow Star is an item that appears in Super Mario Galaxy and Super Mario Galaxy 2. When collected, it transforms Mario into Rainbow Mario (or Luigi into Rainbow Luigi), causing him to become rainbow-colored and leave a trail of light behind him whenever he runs. In this form, he is invincible, can break through certain objects and obstacles, can run faster, and can jump both farther and higher. As the power-up begins to wear off, the music, along with Mario's running speed, will get faster and faster until it wears off completely.
Super Mario Galaxy
Super Mario Galaxy 2
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