a puzzle
there is a code you can get from somebody!
you do the puzzle
you have to finish the puzzle then click on the door
No
U have to find the master sword in kokori forest and break the "mirror" puzzle.
with or without you
shield, lance, mace, broadsword,armor
you do the buttons in this order sun then the star the the solar system and then hit the middle
For Time Tangled Island, move the edge pieces (white border) to the sides, then combine them. For the Binary Bard puzzle on Astro Knights Island, see the related question.
You go through the puzzle door and beat Mordred. (see two related questions)
Into the castle. To follow him, you have to solve the puzzle door. (see the related question)