First choose a level by typing ’50.’, ‘100’, ‘250’ or ‘500’ – (need the period after ’50’ so 500 can be typed) then name the largest World 50K+ city in the circle/ring of that distance range (in km) as the rings expand outward from your location. You need to have your browser’s location function working or the quiz will not load.

You MUST have a city within the initial distance you choose for your level – so this quiz will not work if you are not within a 50K+ city at the distance you chose to begin with.

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 ‘250’ – you will be shown a circle of radius 250 km centered at your location. Naming the largest city in this circle will cause another ‘ring’ of radius 250 km to appear outside that circle. You now need to name the largest 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 250-500 km (assuming your level is 250 km), it will expand to be a 250-750 km ring, then 250-1000 km and so on until a city is found within the ring.