Type 'easy' or 'hard' to begin the quiz. Easy is a 15-degree grid, hard is a 10-degree grid. Then, try to name the LARGEST city in each grid square which fits the category label for each square. To name a city, you must first click on the grid square to make it have a GREEN border. Then, type in the city answer for that square followed by a '.' (a period). You are given a score from 0 to 100 based on your answer's population compared to the largest city accepted in that square (100 being you named the largest city).
LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 50-100K) means the city has that range for its population.
2+ WORDS means the city name has 2 or more words (words denoted by a space or hyphen).
At the end of the quiz the largest population missed answer will show in each unanswered square, and for those answered the largest city will be listed if you didn't answer it.
Quiz Takers 
Itaberaba, Brazil is not working
fixing.
How about adding a 2,500 option (2K5H, as in ‘Two thousand, five hundred’) for those in China, USA, India, etc. so they get cities in countries other than their own and immediate neighbors (for example, someone in the Detroit area using 1k only gets the US, Canada, Mexico, Cuba and a few Caribbean countries)?
Let me put it this way: The 1k option for someone like myself in the Detroit area doesn’t quite reach Los Angeles or Tijuana (but it DOES get San Diego, oddly enough, but NOT Chula Vista!); The San Francisco Bay Area is out of range of anyone east of Fort Wayne.
2,500 would certainly get someone in my area cities in the UK, Ireland, Colombia, Venezuela and Portugal, and likely in Spain, Peru, France, Brazil and Germany.
Okay… so Chula Vista shows up part of the time… because my location tends to drift a little, even though i’m in the same place…