Toadstool's plane makes a sudden landing on the airstrip. It seems goop is blocking the way. Swim around the stuff to where Peach saw the fake Mario. Just past the two blue boxes should be a strange device. Strap it on, lend an ear to it, then rush back over to the air strip. Clear away enough goop with the FLUDD so that you can hit the center of it all pretty easily--don't bother with the rest. After hitting the center for a while, Mario should awaken a piranha plant covered in the stuff. Its weak spot is its open mouth, but don't wait until it's open to hit it. Trace the plant back and forth, shooting around the its mouth, and when the mouth opens Mario will be sure to hit it. Three times and the gunk will disappear, leaving behind a shiny yellow object. Grab it.

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