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If you like challenging educational style games, give GeoMaster a try. It is .99 on the iTunes app store and is a lot of fun! You can get it for both your iPhone and iPad! You get to test your geography knowledge with world capitals, european countries, cities, states, flags, seas, etc. It is good for adults and children and you can change the level of difficulty as you get better and better at the game!
Image Source: http://itunes.apple.com/us/app/geomaster/id331747091?mt=8