I have to say that whilst I am partial to the wooden puzzles, I really like this cast aluminium version. It is a 48mm cube and really quite a good weight (if you drop this on your foot you will certainly know about it!)
The aim, obviously, is to take the puzzle apart and then reassemble it. It is a pure coordinate motion puzzle and separates into the component 3 pieces quite easily. Just find 2 diagonally opposite corners belonging to 1 piece and then just holding them give it a little shake and the 3 pieces start to slide apart.
|Curly cube partially open|
|Curly cube pieces|
I really don't think this is worthy of a 7 rating - I would give it a 5 (or 6 at a push). My only criticism is that each of the 3 pieces is actually made from 2 sections welded together (you can see the joins in the photo above) - it really would have been lovely if they could have been cast as a single piece. Despite this (and also despite its simplicity - no real challenge to the seasoned puzzler), I really like this one. It has a marvellous tactile nature, feels great to fiddle with and looks great on the shelf.