Type 'easy' or 'hard' to begin the quiz. Easy is a 15-degree grid, hard is a 10-degree grid. Then, name any 50K+ World city in each grid square which fits the category label for each square. Grid will be randomly placed each time the quiz is played.
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 250-500K) 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 square.
Quiz Takers 
What is the source for answers for Tanzania? I would imagine Iringa would be bigger then Ifakara for example.
http://citypopulation.de/en/tanzania/cities/
Um, I selected Germany and someone has a score of 29 (more than the number of letters available, but obviously also more than the number of letters in the alphabet)?
Bosnia & Herzegovina isn’t working for me. Selecting it in the drop-down menu just does nothing, and I have to refresh to choose another country.
fixed this.
Here’s an idea for a similar quiz. You’ve created one with the largest US cities for each census – how about the largest US cities for each letter of the alphabet for each census? Might be too labor intensive, but thought I’d throw it out there