Which one of many?
There is a hidden stairway to the dungeon in the castle library, and a hidden opening under the fountain.
There is no well at the mill. There is, however, a rope, and a secret society member, and a hidden hovercraft.
There are no bird eggs in astro knights island.
You do not get or use a bucket on Astro Knights Island.
To obtain the moldy cheese in Astro-Knights on Poptropica, you need to first find the rats in the secret dungeon. They will steal the moldy cheese from you, which you can then retrieve by using the Rat Trap item in your inventory.
There is no treasure chest on Astro Knights Island.
no there is not a cheat to get past the dragon on astro knights
The manure is used to power the hovercraft hidden in the attic of the mill. (see related question)
There's a lock under the hay in Astro Knights
How do you talk to the girl in the hay loft at astro knights island?
This is the first item on the island. Go to the Mordred Musseum and spend it. Get the library slip and go to the castle library.
The key unlocks the entrance to Mordred's hidden underground laboratory. (You will find it under two bales of hay.)