you have to go to the library in the castle go down there should be a crumbled up paper click it it might open but you have to collect paper from under his bed in the museum then once you click the paper and the part of the floor opens up there should be the stinky cheese on the floor
you go to the castle and go to the bottom right room and you put the cheese down and you get the mechanical mouse
go to the secret door
In the undergroud part of the libary
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.
On astro knights after you got the library slip go to the library in the castle. Look at the library slip,it says nonfiction McM.Go to the lower section of the library and click on the waded piece of paper. Then go down and you go right and walk on the cheese and you have it.
the mouse is in the princesses room in the hole in her wall but you have to get the cheese to get him/her.
After you get the cheese you put it in the princesses dressing room and capture the mouse to feed it to the owl.
get the moldy cheese from the basement of the castle and lay it out in the bed room
just walk pat it and it will pick it up
go to the princesses maid's room and use it you will get the robot mouse
Go to the library. Click on the McM logo on the bookshelf. A staircase will appear. go down. There's the cheese.
Find the old cheese. . Give the cheese to the mouse and give the mouse to the owl.
In the Maid's room (castle first floor left), feed the cheese to the robot mouse.