very difficult - but doable druchaus

As the owner of all the available balls of perplexus I zugelgt me this UFO.
The difficulty level is relatively high - but it's not true that it is not feasible for children.
My son (8 years old) had after 2 days completely solved it (I, however, so far not yet).
However, my son has been through all our other perplexus - and is therefore not a beginner.

The outer plastic is much thinner (slightly flexible) than for example in the perplexus - is nevertheless not yet gone kapputt.
I find it at this price quite a great success - but not for beginners.