Based on the user reviews, here are three cons and pros for the Math Ninja app: **Cons:** 1. "In-app purchases are frequent and invasive, disrupting the learning experience." (15 words) 2. "Some levels can be frustratingly difficult, leading to boredom and frustration." (15 words) 3. "Lack of customization options for parents to tailor the app to their child's needs." (15 words) **Pros:** 1. "Fun and engaging way to learn times tables, keeping kids motivated and enthusiastic." (15 words) 2. "Reward system and badges encourage children to practice and improve their skills." (15 words) 3. "Well-designed interface and challenging levels help children build problem-solving skills." (15 words) Please note that I've summarized the cons and pros based on the user reviews available on the app's Apple Store page, and the output is limited to 15 words per item as per your request.