Math Challenge - Brain Workout is an Android app developed by Paridae that allows users to test their math skills and exercise their brain. The app is designed for both kids and adults and offers 12 levels with increasing difficulty. Each level has 20 questions, except for the last level which has 50 questions. Users can practice addition, subtraction, multiplication, and division on positive and negative numbers with operations on two and three arguments.

In addition to improving math skills, Math Challenge - Brain Workout also offers brain training exercises. The app has a ranking system that allows users to compete with other players and an online multiplayer game mode. Users can also earn achievements throughout the game.

Overall, Math Challenge - Brain Workout is a great app for anyone looking to improve their math skills or exercise their brain. With its fun and engaging gameplay, users of all ages can benefit from this app.