A new quiz App called "Rank Master" is now available for iOS and Android. The simple but addictive idea is, that the player has to rank countries according to certain facts, a little like the “Fastest Finger” of “Who Wants to Be a Millionaire?”.
Rank Master combines fun with learning

and surprises with unexpected facts about different countries: Is Canada bigger than China? Does Brazil have more internet users than Germany? Does the huge South Africa or maybe the populous United Kingdom have more kilometres of roadways? Do people in the United States or in New Zealand have a higher life expectancy?
The country data and facts are loaded directly from the CIA World Factbook. With more than 200 countries there are millions of possible combinations and therefore almost no constellation will occur twice.
App Store Link:
https://itunes.apple.com/app/id661308172?mt=8&at=10l3Vy
Developer Blog:
Rank Master – Country Ranking Quiz released for iOS and Android | DonkeyCat