For each country, type the number of a parallel that runs between its northernmost point and its southernmost point. You are shown the number of possible answer.
Extreme points of countries from wikipedia pages
If no integer parallel crosses the country, the two closest ones are accepted
At most 10 type-ins are allowed so at times you'll get away with just typing the first digit (eg if answers from 30-45 are accepted, typing 3 will do)
Countries are sorted by n. of parallels and then alphabetically. This means the quiz gets harder as you move on...