Yoshi squirmed through the damp, brownish mud as he dug down into the earth. He then fell fifteen feet from the muddy ceiling and landed on the hard ground, coughing out dust as he got up and shook his head. He gasped as he saw Birdo and Peppy in cages, both of them set on a large, gray stone. As Yoshi slowly approached them, a large Piranha Plant came crashing down to the ground, scaring Yoshi. The Piranha Plant then extended its large leafs, and it bellowed loudly, the orange pedals on its red, white-dotted head picking up.

Yoshi gulped, and he got into a fighting stance. The giant Piranha Plant gasped for some air, and then it expelled some brown goop from its mouth, hitting Yoshi. Yoshi moaned as the goop fell on him, and he struggled to get out from sinking in it. Fluttering upwards, Yoshi landed on the clean, damp mud, and he started tossing his green-spotted Yoshi eggs at the Piranha Plant. The Piranha Plant bellowed, and it spun around, hitting Yoshi with one of its powerful leaves.

Yoshi screamed as he hit the wall on the other side. He fell to the ground, and shook his head, getting angry. He then ran towards the giant Piranha Plant and jumped up, whacking the monstrous plant with his tail. The Piranha Plant bellowed in pain, and it slapped itself, flapping into the air. It then released some goop, hitting Yoshi again. As Yoshi turned into an egg and rolled about to get the goop off him, the giant Piranha Plant snapped at Yoshi, trapping him within its mouth. Yoshi hatched out of his egg shield and started using flutter kicks within the mouth, forcing the Piranha Plant to spit him out.

As the Piranha Plant moaned for a few moments, Yoshi ran towards it and jumped up in the air, slamming his head onto it. The giant Piranha Plant moaned in pain, and it bellowed one more time, snatching Yoshi and chomping on his flexible body within its powerful jaws. Yoshi struggled a bit, but he then started to try and flutter kick. This proved useless, as Yoshi was swallowed into the Piranha Plant and spat out as goop. Yoshi moaned in disgust, shaking himself and turning around. He turned into an egg once more and rolled towards the Piranha Plant, but the Piranha Plant whacked at Yoshi, using its leaf to imply enough force to break Yoshi out of his shield and sending him to crash into the wall. Yoshi moaned weakly, but he knew he had one more chance, and he grabbed the giant Piranha Plant with his long, red tongue. Pulling the raging monstrous plant closer to him, the green Yoshisaurus jumped up into the air and started to flutter kick down on the Piranha Plant's head. The Piranha Plant moaned in pain, and was finally knocked out cold after Yoshi head-butted into the monstrous plant once more, the cages that sealed Birdo and Peppy being broken.

Yoshi cheered, and he ran over to the large, gray rock and jumped up, hugging Birdo and Peppy. It was then that the earth shook, and the ground started to swallow everything. Yoshi, Birdo, and Peppy all screamed as they were swallowed into the damp, muddy ground, along with the large gray rock and the unconscious, defeated Piranha Plant.

Boss Petey Piranha defeated!