Random Landmark to Country

Name the twenty countries whose residents have the lowest median age.

The Sahara Desert touches 10 countries. How many can you name?

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

You will be shown 10 random numbers between 1 and 100 without knowing what's next. Your task is to put them in order! But beware, if a number cannot be placed, the quiz ends...