Click everything in the 2 row, the 2 middle ones in the 3, and everything in the 4
Into the castle. To follow him, you have to solve the puzzle door. (see the related question)
i cant really explain it step by step, but on google there is a video guide that is only 1 minute long and it shows you how to complete it. so, on google search: "how do you solve the puzzle on astro knights" and then click the first video. that's how i completed it!
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.
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)
To solve Mordred's puzzle and enter the castle, press each of the four cards in the second row (once), each of the four cards in the fourth row, and the middle cards in the third row.
Solve the door puzzle and battle Mordred to save the (real) Princess. (see related questions)
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.)
Solve the puzzle door by pressing 10 of the panels exactly once :all four of the panels in the2nd rowthe two middle panels in the 3rd rowall four panels in the 4th rowIf you make an error, exit the scene to reset the puzzle.
Solve the puzzle door. It is fairly easy : push each panel in the second row once, each panel in the fourth row once and the two middle panels in the third row. This will flip all of them over.
Solve the door puzzle (he's Mordred) and battle his robot warrior suit. (see related questions)
Solve the puzzle door and enter to fight Mordred's robot suit, first as Merlin then as your character. (see related question)
You can click on the door behind "her", but if you give her the weapons, you have to solve the door puzzle to enter the final battle against Mordred. (see the related question for the solution)