Arithmetic is a free educational game available on Android that aims to help users improve their addition and subtraction skills. Developed by abe3, this app provides a simple and straightforward interface that is easy to navigate.

The game consists of several levels that gradually increase in difficulty. Each level presents users with a set of addition and subtraction problems that they must solve within a specified time limit. The app provides immediate feedback, indicating whether the answer is correct or incorrect. Users can also track their progress and view their scores on a leaderboard.

Overall, Arithmetic is a useful tool for those looking to improve their mental arithmetic skills. While the app is relatively basic, it is well-designed and effective at what it sets out to do.