The idea is ok, BUT:

Really killing for a geography game like this, is that the answering modes are confusing. Example: Brunei: Yes, it's in Asia, so you should press Asia. However, if you look on the map, it's actually in the map area of oceania. A similar argument goes for Tunisia, and probably lots of others. The game worked fine and reacted quickly, but these kind of things are a deadly sin in this genre...