2204-大井川鐡道の駅

There are 78 different names for the currencies used by the different countries of the world. How many can you name?

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.

Which countries have received a Level 4 "Do Not Travel" advisory from the U.S. State Department since the beginning of 2023?