Click 10 of the "card" panels exactly one time each:
all four panels in the 2nd row
the middle two panels in the 3rd row
all four panels in the 4th row.
(To reset the puzzle, close and reopen.)
Click on each of the cards in the 2nd row once. Click on only the middle cards in the 3rd row exactly once. Then, click all the cards in the 4th row once.
Into the castle. To follow him, you have to solve the puzzle door. (see the related question)
At the Binary Bard's secret planetoid, entering the castle requires you to flip over 20 "cards" or puzzle sections to reveal a hidden picture (and enter the castle). For the solution, see the related question.
On the second row, click everything. In the third, click the two middle ones, then on the fourth line, click all of them.
You need to figure out the puzzle.
To enter Mordred's castle, solve the door puzzle. Click once on each of the 4 cards in the second row, the two middle cards in the 3rd row, and the 4 cards in the 4th row.
to get through Mordred's door, u must figure out the puzzle........ u have to reveal the whole picture. if u still can't figure it out, go on youtube for cheats and type in poptropica astro knights. the first time i got to mordreds door i couldn't figure it out, too
you have to finish the puzzle then click on the door
On the secret planetoid (X11 Y82), you can draw the Golden Key from the crystal, opening the path to the castle in a far galaxy. To enter, you will have to solve the door puzzle by the Binary Bard. (see related question)
you do the buttons in this order sun then the star the the solar system and then hit the middle
find the golden coin at the fountain it will sparkle
Click everything in the 2 row, the 2 middle ones in the 3, and everything in the 4