The object of this quiz is to pick a 50K+ US city to start, then name successive 50K+ cities such that the next city's first letter is the last letter of the current city and the next city is as close to the current city as possible. You must name cities in the format 'City, State' with the state abbreviation following the city.
For example, you start with 'Chicago, IL' - you are now trying to name a city starting with 'O' (the last letter of 'Chicago') which is closest to Chicago. If you answer 'Omaha, NE' - now you are trying to name the closest city to Omaha which starts with a 'A' and so on.
The quiz ends at the 25th city from the starting one. You get 100 points for naming the closest city on each step, and they decline based on the distance your city was from the closest. You get 15 minutes to complete the quiz.
Quiz Takers 
The quiz doesn’t end when you input all the answers — I think something to do with Chinatown being glitched
Just tested it and it ended fine for me.