This is a very difficult puzzle, between interlocking and disentanglement.
More than rotations, we can really speak about very strange moves for this puzzle.
Even if the quantity of move is not extreme, the quality of move make this puzzle extreme.
The level is : 18.104.22.168.12.3.
18 rotations are required to disassemble completely "Tronc commun 4".
10.15 w x
5.418 d x
3.996 w x
2.133 d x