Based on the users' reviews of the 3-Minute Mahjong app, here are the cons and pros: **Cons:** 1. Limited tile sets: Some users complain about the limited tile sets provided, which can get repetitive. 2. Ads are intrusive: Several users find the ads annoying and intrusive, disrupting their gaming experience. 3. No customization options: Users wish for more customization options, such as the ability to create their own tile sets. **Pros:** 1. Engaging gameplay: Many users praise the app's engaging and addictive gameplay, making it hard to put down. 2. Relatively easy to learn: New players appreciate the app's straightforward instructions and ease of use. 3. Regular updates: The app's developers are commended for regularly updating the app with new features and tile sets. Note: The points are based on a summary of the users' reviews and are within the 15-word limit for each item.