Each round drops you somewhere in the world on a street-level panorama. Look around, move along the road, and check for clues like road signs, license plates, language on shop fronts, or the style of buildings. Once you have a guess, place your pin on the map and see how close you got.
World Guesser works right in the browser on desktop or mobile, so there's nothing to install. It's a good pick if you like geography, travel, or just spotting small details other people miss.