A good concept

I gave this puzzle to test my husband, who likes puzzle in general but had not tried 3D.
Plastic parts are solid and practical to nest. They do not degrade, the puzzle can be assembled and disassembled several times without damage.
Parts is adjustable to adapt to the shape of the puzzle. The different floors of the Eiffel Tower were sorted by floor.
Difficulty level: this puzzle is not difficult for an adult. Ninety minutes were enough to ride the Tour. For a child, however, there must be a few hours, even if the parts are numbered on the back.