TOAD BRIGADE TO MAGIKOOPA KEEP!

Start by making your way around the base perimeter of the area. You'll need to collect eight invisible coins scattered around here.

Next, enter the green pipe. Once inside, make your way to the second level and pick up Blue Toad.

Now, collect all the coins on this second level. After that, head to the third level.

On the third level, you'll find the Key in the same spot you picked it up before. Toss this key towards the wind platform, just like you've done previously. Collect the coins on this level. Important: If the key disappears, don't worry! Just go back to where you picked it up to get a fresh one.

Head up to the fourth level. Drop down onto the wind platform. Collect the coins and the Key that are here before heading back up.

Now, open the locked door that's located around the back of the area. Inside, pick up Green Toad.

Keep moving forward and drop down onto the P-Switch. After activating it, return to the area right beside the door you just came through (this is the only way back from the P-Switch platform).

Head back towards the P-Switch, but this time, go past it and enter the Blue Pipe.

Once you emerge, head left. You'll eventually come to the back of the green pipe (the side you can't enter). Look around this area for an invisible leaf that holds the Golden Mushroom.

Now, head in the opposite direction from the leaf. Drop down onto the clouds near the Green Pipe and enter the hole in the back. This will take you to the center tower.

Collect all the coins in the center tower. Then, climb your way to the very top using the green pipe.

At the top, you'll need to defeat both Magikoopas. Once they're down, Yellow Toad will appear.

Finally, go to the "4" elevator and ride it up to claim your Power Star!