Brain N Back is an Android application developed by Quazar that focuses on exercising the brain using the N-Back technique. This application is quite similar to the popular Brain Workshop game found on Windows/Linux/Mac. The instructions are also nearly identical.

The app is designed to help users improve their working memory, attention, and focus. It offers three different modes for practicing N-Back exercises that range from easy to hard. The user interface is quite simple and easy to navigate. It also features a progress tracker to help users monitor their progress over time.

Overall, Brain N Back is a great application for anyone looking to improve their cognitive abilities and exercise their brain. It's free to download and use, making it accessible to everyone. Give it a try if you're looking for a fun and challenging way to improve your brain's performance.