? Switch - 8 Red Coins

This is a mission unique to the Nintendo DS.
Now that we've saved Mario, it's time to use him to get more Power Stars. Some of them will require Mario to be powered up, so let's unlock the first power-up. We stand in the light and look over his shoulder into the light. We find ourselves wearing the Wing Cap in what looks to be the Wing Cap Course, but the message we get tells a different story: "Welcome to the ? Switches of Rainbow Tower! Step on the ?Switch at the top, inside the rainbow ring. When you trigger the switch, all of the ? Blocks you find will become solid. You'll have to hit them to see what's inside!" So, there's no instruction on how to use the Wing Cap. Oh, well. The Red Coins are in the same place and Mario is easier to control here. I get all 8 Red Coins without difficulty. The Star appears on the center tower. If you miss any of them, the Bob-omb Buddy says "Hello! Please take a look at the map below. Memorized it? If you are lost, please talk to me again." When you talk to him after getting them all, he says "Awesome! You've collected all 8 red coins... You don't look it, but you sure are a quick learner. There's nothing left for me to help you with. But I'm always up for a pleasant chat. We get the Star before hitting the switch, forgetting that it will take us out of the course.
Star Get #17, 27 Coins, 4 Lives
We go back into the course, as the light is still shining. We pound the ground to land on the tower, taking fall damage. We step on the switch, stars fly out, and we hear a chime. We get the message: "You stepped on the ? Switch. The ? Blocks have become solid. Hit them to see what comes out. Do you want to save? Yes/No
The clear block near the switch is now a solid red item block so we can get another Feather out of it if we would like to fly some more. We walk off the tower to fall back into the castle, where the light is gone. Let's continue the adventure!
The next Star is Mario Wings to the Sky.