Type 'easy' or 'hard' to begin the quiz. Easy is a 2-degree grid, hard is a 1-degree grid. Then, try to name the largest UK 1K+ cities in each square IN ORDER. 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).
The squares will start with '0/5' (or maybe fewer cities if less exist in that square). Click on a square and enter the largest city in that square not yet answered (so, the largest city if you have yet to answer a city in that square). You will then have '1/5' and need to click on that square to name the 2nd largest city, and so on until you complete all the cities up to 5 (or less if less exist). If you name an incorrect city in a square it becomes 'locked' and turns red and you can no longer accumulate cities in that square.
You receive 1 point for the largest city in a square, 2 for the 2nd largest, and so on.
At the end of the quiz the largest remaining city you haven't named will be shown in each square.
Quiz Takers 
9841/9921
With the recent number of cities, it is impossible to get a high score on the beginner level (9899 cities vs 9901 cities previously).
Yes it is constantly being updated as city-population.de updates – so soon it should be back above 9899.
When you’re back on the site, it’s currently impossible to get a high score, because the top scorers have 9468 cities and only 9462 are currently available.
I’m almost sure the previous version of the quiz (and the longitude one too) had a countries remaining counter which failed to be included in these updated versions. I think that counter is more or less a giving on coverage quizzes. It’s especially useful on higher levels where gaps are very small and I don’t have a clue on what countries I’m still missing. I think a 5/10 remaining countries would be enough.
Ah, the counter is there (though it reads States rather than Countries), but once we choose the level it’s gone so it’s all a matter of tweaking the quiz.