Here it's 3 puzzles in one.
1 common core and 3 different sets of pieces to put around the common core.
A lots of rotations are required.
The difficulty increase with the 3 sets.
Here, you can find the links to select the 3 correct sets :
Tronc commun 1 level : 1.3.1.1.1.3
Tronc commun 2 level : 4.3.4.1.3
Tronc commun 3 level : 1.5.7.14.4
You can also use the photos to select the 3 sets.