I think you lose points for every one you get wrong.
This was way too hard for me - I got the West country fairly well - Cornwall, Devon, Dorset... I managed the South East coast not too bad - Essex, Suffolk, Norfolk... and some of the North, but all in all - Whew!
It was also a bit picky - you had to be pointing with your arrow exactly where you wanted, or it wouldn't take it - some ones that I was SURE of, took two or three tries before they worked.
There were some counties there I had never even heard of, much less knew where they were.