Puzzle very interesting!

I have found in this puzzle a real challenge for my 12 year old child who has never been interested in puzzles. He immediately expressed interest in this 3D puzzle that makes a little cogitate.

I had initially ordered for my younger daughter who loves puzzles, but I saw the age mentioned on the box (12 to 99 years).

Both sides of each piece are important: on one side there is the drawing and the other is a number, which allows to navigate and to simplify the order of construction.
We can assemble the pieces flat and then mount them on the planned bases (plastic pieces)
certain parts, located in the corners of the building, fold and form a right angle.

They air quality because they are not cardboard but of plastic.

In short we are excited about this gift. After the Eifel Tower, I'd love to help him build Big Ben soon!