I definitely advise geo quiz instead of this app. Geo quiz is more expensif, but it does capitals and country locations and contrary to this app, you can see the countries much more clearly. Also, it only shows the answer once you tap on it instead of giving you multiple choice right away. And with Geo quiz you also have a "learned" and "not learned" button, so it spares you of doing over hundreds of times what you alread know (usa: Washington D.C.) so you can concentrate on what you dont know. And it also has an info tab, so you can look up basic info like (bip/habitant, population, size etc.)