A free app for Android, by Atom Games Ent..

If you want to become an expert in geography, you can’t do better than playing this free quiz game. 

The game consists of multiple levels that will test your knowledge of different aspects of geography. On each level, you will be presented with a country, its capital, and other cities. You will then be given two or three choices as to which country the capital belongs to. If you choose the right answer, you will pass to the next level.

The game allows you to compete with other players from around the world and even to see how they perform on each level. You can view their scores as well as their answers to see which country the capital belongs to.