Type 'easy' or 'hard' to begin the quiz. Easy is a 5-degree grid, hard is a 2.5-degree grid. Then, try to name the LARGEST city in each grid square which fits the category label for each square. Grid squares are placed randomly each time the quiz is played. 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).
AK and HI are NOT included in this quiz as they often have grid squares with only one answer for this quiz.
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 
Issue with Aleutian islands grids not registering should be good now.
Cool, thanks! Just curious, do you mind sharing what the issue was?
Was not calculating the grid square correctly when it crossed over 180 degrees line
Ah, interesting. I had that intuition, but there was a Hawaii cell right below it that didn’t seem to have the problem. I wonder if it’s because the Hawaii cell didn’t have population west of 180?
This format has been such a terrific addition to the site! Probably my favorite quiz format now. Looking forward to seeing how it works for other geographies. Thanks for such a great site.