When you have used the golden coin from the fountain to enter the Mordred museum, and have the library slip, you can enter the dungeon from the castle library, On the lower aisle (non-fiction) press the shelf marked Mc-M.
To see the solar system on Astro Knights island, go to the Planetarium. (not part of the game, but an interesting view)
This means you have already completed the Arturus part of Astro Knights Island. Your spaceship should be parked on top of the castle if you return to the planet.
Only by telling you how. (see the related question)
There is one in the middle (upper part) of the spaceship fountain next to the Mordred Museum.
If you are talking about the one in astro knights island, just push on the part that is blocking the sort of hallway and it will eventually cave in.
In the undergroud part of the libary
On Astro Knights Island, the part of the quest that occurs on the planet Poptropica is in the kingdom of Arturus. The kingdom was attacked by robot invaders who have kidnapped the Princess.
she is on astro knights iland in space
The GOLD COIN is in the fountain next to the Mordred Museum. It is the sparkle in the water in the middle of the water part of the fountain. Use it to pay admission to the Museum.
Yes. You must Sit on the part of the fountain that has water on it. You will see something shiny. Click on it.
depends on where u are. if u have a ship already, it should be on the castle somewhere on the roof. if you don't have a ship yet, watch a you tube video.it really helps!!!!!!!!
There is no candy, and the quest does not include receiving anything from the king. You will, however, receive the coordinates for three planets from the queen. This was part of a nonsense answer to another Poptropica question.