From the Super Mario Wiki
The Jelly Pipe is a sewer level from Yoshi's Story. The stage number is Stage 2-3. The level is made up of a "jelly extractor", used to extract jelly from the jelly-rich soil. However, few things have need to enter the dark sewers, and so they are riddled with strange monsters. Some of these, but not all, include Big & Little Boo, Jelly Ghosts, Spiked Fun Guys, Slugs, etc. There is bue and red jelly and also there is a blue jelly that can't be seen through. There are two parts in the level. The first part has jelly and Jelly Ghosts. The second part has Big & Little Boos and Spiked Fun Guys. In the level is an area with a Slug and the only way to defeat it is by throwing eggs in front of its face.
The Yoshis decided to take a shortcut through a pipe that went underground. Below it was dark and damp, and the creatures that lived there were ugly and slimy. They were scared, but they crawled through. What could be at the other end?
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