Знаток is an Android game app developed by Dmitry Nazarenko. It features various tests on the Russian language, mathematics, and geography. The game has three levels of difficulty: easy, medium, and hard. You earn coins for completing each level, which you can use to purchase hints. To unlock the next task, you must pass the previous one. If you get a score of less than three points, the test is considered failed.

The app is user-friendly and engaging, making it an ideal choice for trivia enthusiasts. The game is well-structured, and the difficulty level increases as you progress, which keeps you engaged and motivated. The app also has a leaderboard, which allows you to compete with other players and see how you rank. Overall, Знаток is a fun and challenging trivia game that tests your knowledge and keeps you entertained for hours.