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TO get into the asteroid castle you have to complete the puzzle on the door.
I'ts in center of the asteroid belt
go to the middle of the asteroid belt and it's on a asteroid go down to it.
you go past the sun then down until it says Warning: Entering Asteroid Belt.
if you mean the planet in the asteroid belt then it is X:11 Y:82
On poptropica, when you get to the asteroid belt, if you are looking for Mordreds little castle that holds the key, go to: X 12 and Y 80. There you will find the little asteroid Mordred is hiding on.
you fly to a large asteroid in the asteroid belt and land there. that is the crystal gate when you climb to the top
Go to the lower left, towards the asteroid belt, and look for an extra planet.
Find the giant asteroid they're talking about. Look in the asteroid belt in the lower left of the solar system.
The main asteroid belt is actually called the asteroid belt - pretty dull really.
Mars is not in the asteroid belt. The Asteroid Belt is between Mars and Jupiter.
go to the link of this page http://www.youtube.com/watch?v=HbXhucdCbf4