Castles are mystical creations. They are not built often enough anymore, but now it's your chance to build a castle exactly the way you want to. You will find a background and you will have to left click and drag each piece to the background. If you don't like the background, you can change it by left clicking the swords at the top left of the screen. There are doors, flags, bricks, blocks, trees, and houses for you to build the most beautiful castle there ever was. It is your castle, so build it how you want to. There is no wrong way to build it.