How do you get through the secret door on Astro Knights Island?

Answer 1

There are three or four secret doors on Astro Knights Island.

• The dungeon door : get the gold coin from the fountain, the library slip from the Mordred museum, and then press the lower shelf in the castle library
• The fountain plaque door : get the secret message from the Maid's room, get the Cosmic Symbols password card from the mill loft, and press the three and the Sun at the fountain
• The underground door : get the key from the last guy under the fountain
• The puzzle door : press each of the following exactly once - the four cards in the second row, the four cards in the fourth row, and the two middle cards in the third row