The stone riddle

Since this page is not working properly and is causing more and more problems, please download this files here on Printables: https://www.printables.com/model/15749-the-green-stone-riddlepuzzle

And this is Version 2.0 of my puzzlebox: https://www.printables.com/model/26140-the-green-stone-puzzle

The goal of the puzzle is to get the green stone with the other stones in the box.
It works, even if it may not seem so. Good luck.

German: Das Ziel des Spieles ist es den grünen Stein mit in die Box zu den anderen zu bekommen. Es sieht vielleicht unmöglich aus, funktioniert aber.