Unlock red ! Boxes
After you have about 12 to 16 stars, there will be a light shining in the main hall. As Mario, press x until you are in 1st person view, then press the up arrow and look at the sun and you will be warped to the rainbow tower. You will be flying, fly down to the landing and jump on the red switch and all the red ! Boxes in the courses will be solid! Also while you are still in the rainbow tower triple jump to fly and try collecting all 8 red coins to get a bonus power star! You don't have to though, also if you fall you wont die! Have fun with the special powers!
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