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You need a key to open the hatch to Mordred's underground lab (beneath the hay bales). You get the key from a member of the secret order that meets under the village fountain.
Get the Princess's secret message from the Maid's room (castle first floor left) and take it to the loft of the mill. The girl in black will give you the Cosmic Symbols card. Go to the fountain plaque and press the three symbols, and the center Sun.
What else can I help you with?
What do you do when you get the key for Astro Knights Island?
the door that's locked
Where do you get the cheese in the library on Astro Knights Island?
go to the secret door
Where is the library section on Astro Knights Island in poptropica?
In the palace the right door
What do yo do if you complete the door puzzle on Astro Knights Island and the door will not open?
you have to finish the puzzle then click on the door
What door do you want the arrow to go in on Astro Knights Island?
you want to arrow the door on top of the castle
Where do you find the ice arrow in poptropica on Astro Knights Island?
the guy at the door fives it 2 you
How do you get in the door to defeat Mordred in Astro-knights island?
use the rope and tjhe code dh h husfvbsufhsuiecdfhf
Where are the hay bales on Astro Knights Island?
There are two in the field by the mill, stuck between two rocks. Push them sideways and then separate them to reveal a locked door. This is Mordred's secret laboratory. But you have to have a key to get in. (see the related question)
How do you unlock the door in the ground under the hay on astro knights island?
You have to find the key. (see the related question below)
How do you unlock the door on astro-knights?
find a way to
What do you do after you go in the portal on Astro Knights Island?
You go through the puzzle door and beat Mordred. (see two related questions)
Where does Mordred go after he steals your weapons on Astro Knights island?
Into the castle. To follow him, you have to solve the puzzle door. (see the related question)
