First choose any US city by entering it and choosing it in the drop-down box. Then, name the largest US city in each 25 mile 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 if it is the largest city in that area.

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

For example, if you choose ‘Chicago, IL’ – you will be shown a circle of radius 25 miles centered at Chicago. Naming the largest city in this circle (Chicago in this case) will cause another ‘ring’ of radius 25 miles to appear outside that circle. You now need to name the largest US 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 25-50 miles, it will expand to be a 25-75 mile ring, then 25-100 mile and so on until a qualifying city is found within the ring.

A little too tough?
US 50 Mile Expanding Circles Challenge – Choose City