Biggest and Smallest A-Z Countries in 90 seconds, with a Map
To complete the map you have to type the largest and smallest country for each initial letter. When you type a country, all the ones that are smaller than it and have the same initial letter will get filled in, except the very smallest. This means that wrong answers can still be of help to see what you're missing.
Suggestion: click 'show missing' countries' before starting the quiz!