The application is a unique platform designed specifically for those who want to improve their knowledge of the Russian language and take various tests and exercises. This innovative application will help users improve their literacy, expand their vocabulary and improve their communication skills in Russian.

The entire Russian language is divided into 27 sections, each section contains 10 tests. Each new test is unlocked after completing the previous one.

List of all sections:
1. Letters and sounds (phonetics)
2. Syllables (phonetics)
3. Stress (phonetics)
4. Synonyms (vocabulary)
5. Antonyms (vocabulary)
6. Paronyms (vocabulary)
7. Homonyms (vocabulary)
8. Phraseologisms (vocabulary)
9. Root (word formation)
10. Prefix (word formation)
11. Suffix (word formation)
12. Ending (word formation)
13. Noun (morphology)
14. Adjective (morphology)
15. Numeral (morphology)
16. Pronoun (morphology)
17. Verb (morphology)
18. Participle (morphology)
19. Gerund (morphology)
20. Adverb (morphology)
21. Preposition (morphology)
22. Union (morphology)
23. particle (morphology)
24. interjection (morphology)
25. Phrase (syntax)
26. Commas (punctuation)
27. Dashes (punctuation)

The main features of the app include:

1. Diverse tests: App users will be able to choose from a wide range of tests, including spelling, grammar, punctuation, word usage, and many others. The tests will be tailored to different levels of difficulty to suit the needs and skills of each user.

2. Feedback and explanations: After each test, the app will provide detailed feedback and explanations to the user about their results. This will help them better understand their mistakes and learn the correct answers to improve their score.

3. Customization: App users will have settings available to choose tests and exercises that best suit their level of knowledge. The ability to select specific topics such as verbs, nouns, tenses, and other grammar categories will also be available.

4. Progress and achievements: The application will track the user's progress, save the results of past tests and display achievements. This will help users see their improvements and be motivated to further study the Russian language.

5. The application is completely free and works without the Internet and registration, at any time and in any place.

Overall, the mobile application will provide users with a convenient and effective way to improve their Russian language skills. With a variety of tests, feedback and additional resources, it will become an indispensable tool for anyone who wants to achieve their language goals and confidently speak, write and understand Russian.

In essence, this is a game (quiz) that not only tests knowledge of the Russian language, for example, grammar, but also allows you to learn new words and expand your vocabulary.

Each section contains unique tests, for example, you will find various simulators that allow you to better remember the rules, or study spelling, learn to identify parts of speech, understand where and why you need to insert certain letters and many other tasks!

The application is suitable:
- for beginners from scratch;
- those who already have a good command of grammar;
- to prepare for the Unified State Exam;
- for those who want to repeat the school course.

In the next updates, it will be possible to take an exam in each of the sections, and also the "Super Test" - this is a test of 50 random questions in all sections!

We wish you success in your studies, you will definitely succeed!