World flags & capitals quiz

This app can enjoy quizzes on flags and capitals of the nations of the world.
The more you play this app, the more you acquire your knowledge.

You can enjoy 6 kinds of quizzes
・Nation Flag → Nation name
・Nation name → Nation Flag
・Mix quiz（Flag → Nation name,Nation name→ Flag）
・Nation name → Capital name
・Nation Flag → Capital name
・Capital name → Nation Flag

There is a response time of 10 seconds per question.
You can easily switch the sound on and off.