Crazy Math nerd here
I've done a few calculations (basically, just copied current weekly ranking to MS Excel and built a pivot table).
That's what I've got: 1046 active registered users from 71 countries (+ three users with an “empty” country).
And there's one thing I cannot understand: how come most users are from the Netherlands?
I mean, yes, this
is a Dutch website, but it's multilingual, i.e. international. Still, judging by the population (e.g. 17 million in Holland, 325 in the USA, 127 in Japan, 60 in Italy, etc), the number of Dutch users is disproportionately large.
Why? Is Calcudoku some sort of national sports in the Netherlands (like chess in Kalmykia)? Or is calcudoku.org promoted via targeted ads that are shown primarily to those from Holland? Or does the administrator force his employees / students / friends to register?
Or is it because only Dutch people know this puzzle as Calcudoku, while the rest of the world would google for KenKen? I'm really curious.