More, morer than, the mostest quiz

This quiz has some interesting questions, but I'm not sure you've thought through the implications of having yes/no questions in this type of quiz. The problem is that if a user types 'yes' and it doesn't work, they can just type 'no' and are guaranteed to get it right. Also, without a yellow box I ended up answering multiple questions just by typing 'yes'.

I think this quiz would be much better as a multiple choice quiz, especially for the country size question! You gave me the answer. With multiple choice I don't know the answer until I submit it.