Every The Doobie Brothers song that hit the Billboard hot 100

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

We made a list of the 20 countries that have the largest economies. 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.

Drag the pin onto the correct country. Careful, though! Three wrong moves and the game ends.