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It is not a dungeon, but an underground lab, and you get the key by taking the secret message (maid's room in the castle) to the Mill (second floor), and using the Cosmic symbols to open the secret chamber (under the village fountain).
Once inside, you will need to feed the mechanical mouse to the mechanical owl, then push the dirt wall down to go left into the rear entrance of the castle dungeon.
What else can I help you with?
How do you get through the block in Mordreds Hideout in astro knights island in poptropica?
you push through
How do you get the paper from the person inside the mill on astro knights island on poptropica?
You go into Mordreds lab and grab a paper and turn it into her.
Where are the invaders on Astro Knights Island?
One of the robots was captured and is in the dungeon.
Where is the entrance in the library to the dungeon on Astro Knights Island?
next to a bookshelf.
How do you find the dungeon on Astro Knights Island?
IS IN DA LIBRARY... SOMWEAR.... and i dongt
What do you do to get the 3 people to get away from the dungeon opening on astro knights island?
Nothing!
How do you get in the dungeon from Mordred's hideout on Astro Knights Island?
Push through the dirt wall. You should already have opened the back gate with the switch in the dungeon. Feed the mouse to Merlin. He can retrieve things for you.
How do you get to the JAIL on astro knights island?
There is no jail on Astro Knights Island. There is a castle dungeon, where an attacking alien robot is being held after his capture. (see the related question)
What does the owl do on Astro Knights Island?
Actually, Merlin has little to do on Astro Knights Island. He recovers the fuel rod from the dungeon when the robot self-destructs. And he battles Mordred at the very end of the island.
Where is the key to the dungeon on Astro Knights Island?
There is no key to the dungeon. The small key open Mordred's underground laboratory, which has a back way into the dungeon. (see the related questions)
Where is the dungeon in Astro Knights Island?
under the library, you click on the McM label and stairs appear
What do you do in the dungeon on Astro Knights Island in poptropica?
You have to drive the jeep into Wal-Mart and do the hokey pokey.
