From the Super Mario Wiki
Puffprod Peaks, or World 2-2, is the eighth regular level of Super Mario 3D World and the second one in World 2. It is unlocked via completing Conkdor Canyon, and its own completion unlocks Really Rolling Hills. 15 Green Stars are required to access this level.
The level starts in an area which has a Touchstone which can be raised by touching it on the Wii U GamePad. After avoiding some Piranha Plants and Galoombas, the player reaches a set of platforms which must be activated through use of the GamePad. The Checkpoint Flag and a Propeller Platform which can be raised by blowing through the microphone on the GamePad await, followed by a Warp Box which leads the player to the next area. After a network of the aforementioned platforms and a Piranha Plant-infested area, the player reaches some more Touchstones that lead to the Goal Pole.
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