Find the missing cat for the clerk at Carrot Surplus, and you get a reward : a crowbar. You can pry off the large drain at the right of the factory.
At the bottom left on your screen on Poptropica there should be a small blue map, which will guide you through all of the mazes.
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)
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).
The only underground apparatus on 24 Carrot Island is the equipment stealing the carrots from the carrot farms. (They are used to make rocket fuel.) The operations of the evil Dr. Hare are all in the old Carrot Cake Factory to the far right of the island. You can get in through the sealed waste pipe if you have a crowbar. (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.
Through the chimney
Use the crowbar to open the sewage pipe tp enter the warehouse on 24 Carrot Island.
You enter the old carrot cake factory through the waste pipe along the water at the far right. You need a crowbar to open it, and you can get one by recovering the missing cat. (see related question)
The mayor of the town on 24 Carrot Island will give you the Island Medallion when you complete the quest.
24 Carrot Island is the 4th island of Poptropica. It came out in June, 2008.
24 Carrot Island does not have a cockpit. 24 Carrot Island was released in 2008 and the main objective of the game is to stop the evil Dr. Hare from controlling Poptropica.
At the carrot factory.
you try to get through the doors again and it will let you in