I believe this sort of quizzes are best way to remember capitals. No one is like me on Jetpunk who still suffers to remember African capitals. BTW, Good quiz Stewart.
Bujumbura was one of the African capitals I could ALWAYS remember because it was similar to Burundi and just went together perfectly...And then they went and changed it on me lol. I can't ever remember Gitega on these quizzes now. Not cool, Burundi...not cool!!
Maybe let one of the Congos or Guineas have the old name.