I had asked some suppliers including Hendrik Haak, no one wanted to confirm the
¡§IQube¡¨ they are selling is the same ¡§IQube¡¨ which was on the market years ago.
In the List of Chosi¡¦s Puzzle collection, there is a different puzzle named ¡§IQube¡¨,
and Happy Cube has some different trade names, IQube is one of them.
So, we have to search the birthday of such puzzle (not the name of IQube) first.
I think at least we can get the first purchasing date of this ¡§IQube¡¨ puzzle I mentioned (in the picture). http://www.puzzle-shop.de/iqube.html