Based on the user reviews, here are three pros and three cons of the app: Pros: 1. **Engaging and challenging questions**: Users praise the app's ability to keep them engaged with its diverse and challenging questions. 2. **Adding friends and competing**: Many users enjoy the social aspect of the app, competing with friends and tracking their progress. 3. **Rewarding and fun experience**: Reviewers praise the app for its rewarding and fun experience, with many indicating they look forward to playing every day. Cons: 1. **Limited customization options**: Some users find the app's lack of customization options, such as difficulty levels, frustrating. 2. **Notification overload**: A few reviewers complain about receiving too many notifications, disrupting their daily routine. 3. **Inconsistent question quality**: A few users criticize the app for having inconsistent question quality, with some being too easy or too hard. Please note that these summaries are based on a limited sample of user reviews and may not represent the opinions of all users.