grv, please reveal your source. I find the selection of cities to include (and more importantly exclude) quite disturbing. I would describe it as neo-colonial. You have been fairly comprehensive when it comes to Western countries, esp USA and UK but for many countries in the developing World or elsewhere have selected only the most major cities, in many cases it seems, just the capital. In some cases, Tunis and Addis Ababa for instance, not even that.
My source is from ontheworldmap.com: Maps of all cities of the World. I did not check through the whole list and make sure if cities were there or not because this was the only list I could find. I apologise that this quiz did not contain every city. However, if you know another reliable source that has every city on earth, I would be more than happy to make another one. I also just wanted to test the limits of JetPunk quiz making.