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The Nose Deck is a location in Bowser's body in Mario & Luigi: Bowser's Inside Story, it is apparently located in Bowser's nasal cavities. When Bowser smells a weird pollen, Mario, Luigi and Starlow come here because of an odd disturbance. Here, Mario and Luigi blast pollen onto sections of Bowser's nose to make him sneeze. Sneezing will lead to several advantages in the game. To do this, Mario and Luigi must knock pollen into the sides of Bowser's nose while performing a perpetual Spin Jump. Once all of the nerves are aggravated by the pollen, the bros. must now avoid the spiky pollen and hit the inflamed nerve when it appears. Doing so successfully will make Bowser sneeze.
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