Pick a country, then name every one of its states, provinces or regions.
Name the states, provinces or regions of a country: the 50 US states, Canada's provinces and territories, France's regions, Japan's prefectures and many more. A country's first-level divisions are the ones directly below the national government. If you've done a states or provinces quiz on Sporcle or JetPunk, it's the same format. (Geographys isn't affiliated with Sporcle or JetPunk.)
Every country divides itself up, but the divisions go by many names: states in the United States and Brazil, provinces in Canada and Argentina, regions in France, prefectures in Japan, cantons in Switzerland, oblasts in Ukraine. In federal countries like the United States and Germany they have their own constitutions and powers; in unitary countries like France and Japan they run what the national government hands them.
There are 156 rounds, one for each country or nation with divisions worth naming. Some countries have a handful of divisions and others several dozen, so the clock is set by how many there are.