Flags Quiz is an Android app developed by Krzysztof Osiak. The app is a trivia game that tests the user's knowledge of flags from around the world. The game is available in six languages, including English, Polish, German, Spanish, French, and Russian.

The game is simple to play. The user is presented with a flag and has to guess which country it belongs to. If the user is unsure, they can use a coin to reveal a letter of the country's name or use a hint to display the country's location on a map. The game has different levels of difficulty, which makes it suitable for all ages and knowledge levels.

Overall, Flags Quiz is an entertaining and educational game that helps users learn about flags and countries from around the world. The app is free to download and use, making it accessible to everyone.