It is an app that you can memorize national flags, country name, country place. Though the national flags are included in regions other than the country, let's remember them together. Since quizzes divide the problem for each area and the accuracy rate for each country is also preserved, You can learn efficiently while checking the part I am not good at. · About difficulty level There are normal and hard. Normal mode is country names are displayed. Hard mode is only the national flag is displayed. · About clearing Solving the problem to the end will result in clear. If you make 10 mistakes, the problem ends. Since Rank is decided by clear time, please aim at the master.