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 European 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 
Swidnice and Povoa de Varzim didn’t work for me. They may be spelled wrong.
fixed Povoa – not seeing Swidnice listed as one, maybe it was recently added since I made the quiz, or a former FUA?
Hmm whats the Ruhr area called here? I tried the various big cities, Ruhr, Ruhr area, Ruhr valley, Lower Rhine, Rhine Ruhr, Rhein Ruhr but none of those worked. I think Ruhr / Ruhr area / Ruhr valley are pretty common.
was under ‘Ruhrgebiet’ – fixing now.
will get these added
Birmingham should probably be accepted for West Midlands, and “Lisbon” as an alt spelling to “Lisboa.” Couldn’t get Ljubljana either, not sure if I had misspelled it twice or if I’m missing an alt spelling?
fixed Lisbon and the Slovenian ones. Leaving West Midlands as that is the name of the county area, the area is not just Birmingham.
I tried several in Romania and none seemed to work.
this is fixed.