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In the sewer, jump or move in the direction the rats are heading.
The closed Carrot Cake Factory is to the right side of 24 Carrot Island. You will need a crowbar to get in through the sewer pipe at far right. (see related question)
At the Carrot Cake Factory, take the map from the window near the roof, and open the pipe using the crowbar. Inside, you will find the Carrot Transporter that can take you out of the factory. Cross the red "bottle cap" trap doors one at a time, and slip past the rat by climbing through the loop pipe at the top.
Return the missing cat to its owner and you will get a crowbar to pry open the sewer cover. (see related question)
There is a sewer in Early Poptropica, below Main Street, with lots of spiders. The sewer in Super Power Island is under the restrooms in City Park. Go down from inside either one (gender specific).
The sewer is in the bathroom in the park.
Ratman is on Super Power Island. There is a large rat in the sewer entrance to the factory on 24 Carrot Island (climb up into the bypass pipe to elude him).
You go screw the wheels until you get to a door. You go inside the door and there is ratman and you have to defeat him.
The tunnel runs from the water to the factory floor. Pick up the Carrot Transporter and get past the trap doors and the rat, and turn on the power to the factory. (Switches : down, halfway down, down)
beat Ratman
by siwming
it is on the street "poptropica towers"