After you get the cheese you put it in the princesses dressing room and capture the mouse to feed it to the owl.
go to the secret door
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
In the Maid's room (castle first floor left), feed the cheese to the robot mouse.
There are no bird eggs in astro knights island.
its on the island
How do you talk to the girl in the hay loft at astro knights island?
you go inside, get the moldy cheese and pull the lever down.
To catch the mechanical mouse, in the Princess's Maid's room (castle first floor left).
On every island you have to be the one to save whatever needs saving. That includes the kingdom in Astro Knights Island.
In the Maid's room (castle first floor left) you will find a mechanical mouse.
Once you have built a new spaceship on Astro Knights Island, it will park on top of the castle whenever you leave the island.