Ravensburger has made an awesome puzzle. Period :)
The ultimate puzzle for people who loves the challenge. The drawing of where all pieces go is inside a closed envelope, which makes it your own choice to get the help or not. Im very experienced, but I had to open and look. But the puzzle was still lots of fun to do, because of the different shapes. Forget about regular puzzles. This takes the term puzzle to a whole new level :)