Well, I know plenty of gamers outside of .za, but alas none who live in the rest of Africa. I wouldn't be surprised to find some gaming groups in some of our neighboring countries, and in other parts of anglophone Africa, especially east Africa (Kenya in particular) and maybe Nigeria (mostly because of the significant population of ex-pats doing contract work there). That said, I've visited a fair number of other African countries and have never bumped into other gamers or found any shops selling anything even remotely game-related.
Here in South Africa, there are sufficient gamers to support a handful of gaming shops (at least two in Johannesburg, and at least one in Cape Town) as well as an annual gaming convention. I'm pretty confident that counting only South African gamers, Africa still outnumbers Antarctica by a fair margin.