Based on the users' reviews of the "Mathematical N-Back" app, here are three pros and three cons: **Pros:** 1. Many users praise the app's ability to improve working memory and attention span. 2. The game-like interface makes math practice enjoyable and engaging. 3. The app provides a sense of accomplishment and progress with each level completed. **Cons:** 1. Some users find the app's math problems difficult and frustrating to solve. 2. The app lacks clear explanations or tutorials on how to play and understand the game. 3. The free version has limited levels and features, prompting some users to upgrade to premium. Note: The language used is concise and within the 15-word limit for each item. The conclusions are based on the overall sentiment and opinions expressed in the user reviews.