Based on the users' reviews, here are three cons and pros of the Mermaid Rush 3D app: **Pros:** 1. Engaging gameplay with challenging levels and rewards for progress. 2. Beautiful, vibrant visuals and immersive underwater world. 3. Easy to learn, fun to play, and great for all ages. **Cons:** 1. Difficulty level increases rapidly, leading to frustration and lack of progress. 2. Some levels are repetitive and feel too similar, leading to boredom. 3. Frequent ads interrupt gameplay and are difficult to close.