You'll need 170 gems to unlock this level.
It's time to reunite with the Toad Brigade again. Collect as many coins as you can. As before, move the arrow platforms so the Spike destroys the barriers in front of you and below you. Drop down and go around the corner, heading away from the Spike. You'll find Blue Toad over here. Go around the corner and defeat the Piranha Sprouts. Underneath the platform the Spike is standing on, there is a plant with a key. Stand on the touchstone and lower it to reach the locked door. Green Toad is behind the door. Return using the touchstone and have the nearby Spike destroy the barrier. Quickly and carefully cross the spikes and move in a slight circle to make sure all Toad Brigade members are on the touchstone. Raise the touchstone and move the arrow platforms so you can reach Yellow Toad near the Spike. Drop down carefully to the spiked platform, then drop down to safety. There's a hidden Gold Mushroom nearby. Grab the coins in the area before taking the elevator for four up to the Star.
Special Challenge: Collect 150 coins.