Based on the user reviews on the Apple App Store, here are three cons and three pros of the "Brain Challenge 2020" app: **Cons:** 1. **Too many ads**: Frequent and intrusive ads disrupt the gaming experience and are frustrating. 2. **Limited difficulty levels**: The game becomes too easy or too hard too quickly, leading to boredom. 3. **No social sharing**: Users cannot share their progress or brag about their scores on social media. **Pros:** 1. **Engaging puzzles and games**: The app offers a variety of challenging and entertaining puzzles and games. 2. **Improves cognitive skills**: Regular use of the app can improve cognitive skills such as memory, attention, and problem-solving. 3. **Fun and relaxing experience**: The app provides a calming and enjoyable experience, perfect for relaxing and unwinding. Note: Please keep in mind that user reviews are subjective and may not reflect the experiences of all users.