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 
need to allow full screen mode and also make the correct marker a different color (currently both are green if you guess close)
Kinda hard to click on phones and tablets but it’s like this everywhere so it’s not that bad
How does the quizz start ?
was a bug – fixed.
why for 0 km you still get 99 and not 100
You can always use the zoom function though admittedly it will make you lose some time zooming in/out and moving the map around. Previous locator quizzes were not timed so it adds an extra challenge.
A little hard to click precisely when places are so close (especially around Paris), but nice quiz.