Re: No rankings page for Africa
True, that's a feature request
The various rankings have to be explicitly coded, you can't just put a continent or country and get the rankings for it.
In the past I've added countries/parts of the world once there were enough (say 20 or so) active puzzlers from it.
(some have then declined over time though).
I'll look at adding a separate list for Africa.
Edit: and I see I should remove a few countries, e.g. Colombia..
Patrick