Original description: Find yourself and solve the mystery of the FY Castle. First of all, you have to find the ghost of your avatar locked up in the crypt of this enchanted castle and then you can solve all the puzzles and mysteries locked in the dungeons of the ancient Fyvie Castle. It is unlikely that you will succeed on the first try, but don't look at the resolution right away, it is not as difficult as it seems, you just need to try and learn from your mistakes. Have fun.
Thanks again to @ridgerunner for pointing out the shortcut that cannot be allowed in this kind of level.
Spoiler: Video Walkthrough 1.0 It makes no sense to update the gameplay to version 1.1 as it changes very little. A ball descent was also facilitated.