Sudoku: Train Your Brain is a free puzzle game developed by Andrey Rebrik for Android devices. It is a classic game that has been around for years, but this app has some new features that make it stand out from the rest.

The game has four levels of difficulty – easy, normal, hard, and very hard – to suit players of different skill levels. It also has a menu of game statistics that allows you to keep track of your progress at various levels of difficulty. The user-friendly interface allows two separate keyboards at the same time to enter values in the cell and put your notes, which will help solve the challenging puzzles of the game. The level of complexity "Very hard" contains a total of 17 cells in the puzzle, and for those who like complex puzzles, there are more than 50,000 different tasks.

The game provides system prompts and error checking to help you get out of highly complicated situations, and it also supports offline mode, allowing you to play Sudoku online or offline. This app is a great way to keep your brain active and improve your logical thinking skills.