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 
Where is Dublin – Belfast? The distance is like 150 km.
need to begin with same letter 🙂
The distances are a bit strange and inconsistent.
For #2 both cities directly border each other, so the distance must be between city centers. Which seems to work with the 21.4 km given.
For #3 the closest edges of the city limits are about 34km apart, and quite a bit further for the city centers.
yeah it’s like city centroids I think when measuring the distances, so may not be exactly where you might think the distance should exactly be.
For #20, please consider accepting the alternate (local) spelling that most of the quizzes accept.