I would suggest a few easy answers (UK, China, France, Brazil, Australia) or similar "big" countries and then users could start to pick out and understand the letters and actually read the more difficult countries once they had some point of reference.
I would suggest a few easy answers (UK, China, France, Brazil, Australia) or similar "big" countries and then users could start to pick out and understand the letters and actually read the more difficult countries once they had some point of reference.