First choose any World 50K+ city by entering it and choosing it in the drop-down box. Then, name ANY World 50K+ city in each 100km circle/ring as the rings expand outward from your city of choice. The first circle will include your city of choice as a possible answer.

When you run out of time or end the quiz, you will see the current ring’s largest correct answer at right (under ‘Answer Stats’ by your coordinates).

For example, if you choose ‘Paris, France’ – you will be shown a circle of radius 100km centered at Paris. Naming any 50K+ city in this circle (including Paris) will cause another ‘ring’ of radius 100km to appear outside that circle. You now need to name the any World 50K+ city in that ring (but not within any previous circles/rings). If a city is not within the next ring of that distance, the ring will keep expanding by that distance until a city falls within it. So if a city doesn’t fall within 200-300km, it will expand to be a 200-400km ring, then 200-500km and so on until a qualifying city is found within the ring.

Want to name the largest city in each ring, or more of a challenge with smaller rings?
World 100 Km Expanding Circles Challenge – Choose City | World 50 Km Expanding Circles Any City Challenge – Choose City