What is Reddit's opinion of National flags quiz?

From 3.5 billion Reddit comments

Thank you! I really like it. I'm a big fan of flags. I don't say it usually I feel like it could strange be for others. I even created an app: https://play.google.com/store/apps/details?id=com.mary.jeanphilippe.drapeau Sorry for my bad english ;)

If you like flags quiz, you can try this app: https://play.google.com/store/apps/details?id=com.mary.jeanphilippe.drapeau

18/20 at the challenge mode :)

I scored 20 at the challenge mode: https://play.google.com/store/apps/details?id=com.mary.jeanphilippe.drapeau

They should have played this app: https://play.google.com/store/apps/details?id=com.mary.jeanphilippe.drapeau