nordic countries

Name all 50 states in the USA. Easy, right?

In 90 seconds, make every country disappear from the map by typing both its first 2 letters and its last 2 letters.

With the help of a map, can you name the countries which existed during the Revolution of 1848?

Click on every square of the world map which contains an urban agglomeration with a population of at least 10 million.