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 
This is a fun one – at a certain point I was asking myself “What country is about the same size as the Bahamas and Slovenia?” and it was like the meme with the equations in front of her face
Tough one!! Figured I was only missing island nations, but ended up leaving 3 mainland nations off my list lol.
20 Hardest data seems bugged, seems to reflect area rather than percentages of correct answers (e.g. Singapore has 728%).
this is a bug when you are the very first person to play the quiz. works after that 🙂