German States - Flags, Capitals and Map of Germany is a free trivia app developed by Andrey Solovyev that helps users learn all 16 federal states of Germany. This app provides a comprehensive learning experience by covering different aspects of the states such as names, locations on the map of Germany, capitals, flags, and German coats of arms.

The app offers four different game modes to choose from:

1) Spelling quizzes (easy and hard)

2) Multiple-choice questions (with 4 or 6 answer options)

3) Time game (give as many answers as you can in 1 minute) - you should give more than 25 correct answers to get a star

4) New game mode: Identify capital cities on the map.

In addition to the game modes, there are two learning tools: flashcards and a table of all 16 federal states. The app is available in 9 different languages, including English, German, and French, making it accessible to a wider audience.

Overall, German States - Flags, Capitals and Map of Germany is an excellent app for anyone looking to learn more about the geography and history of Germany. The only downside is the presence of advertisements, but they can be removed through an in-app purchase.