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 
surprised to see iasi on here
In their native language both Cologne and Vienna would count since their names in German are Köln and Wien, both one syllable.
Yes but I’m using English versions of names for this quiz.
What about Kielce and Trier?
Gdańsk is listed as two syllables on the Wiki page, with the audio sample in the Name section instead of in the opening paragraph.
Will add those two. I have Gdansk as one syllable in my other quizzes and native Polish speakers (I speak some myself) do pronounce it as one syllable.
I thought Lyon had two syllables.
In the French pronunciation the two parts are diphthongs, I am counting those as one syllable.
Player from Lyon here : definitely one syllable in French pronouncing.