Airports in the United States - Sudden Death

Can you name all the countries that have ever been members of OPEC, the Organization of Petroleum Exporting Countries?

Guess the world's twenty most-traded currencies, and the countries or special regions that issue them.

20 random countries have been removed from the map of the world! Can you identify them in 3 minutes?

Drag the flag onto the correct state. Careful, though! One wrong move and the game ends.