Over by the windmill, there are two hay bales (yes, they have a purpose!) and you have to jump RIGHT between them. When you do, they slide apart. Use the small key from the underground society (beneath the well) and use it. Voila! You're welcome.
you run up to it and keep pushing. the wall will eventually crumble
just go to coordinates x=11 y=81
after you have found the cosmic simbles you must then go to the staute and put in the simbles in order then find the key from the freckle face boy with the wierdos in purple robes will give you the key to his lair and it is under the hay!
in the upstairs of the museum.
catch the mouse
In the Mordred museum on the second floor.
On Astro Knights island in the game Poptropica, Mordred's Lair is hidden in the castle. Inside the castle library (located on the right side of the first floor) collect the books "The Life of Mordred: A Cautionary Tale" and "The Mystical Weapon of Arturus" and click on the section of the library specified on your library card. A stairway will appear, leading you to Mordred's Lair.
there are haystacks push them then get the key
Mordred's lab is in Astroknights Island and in between the hay.
near the mill underneithe the two hay barrels
you push through
Chase it out of the cave/Mordreds lab and then set the mouse free.