Based on the users' reviews of the Marble Ball Run 3D app, here are three cons and pros: **Cons:** 1. "Difficulty completing levels due to too much repetition and not enough puzzle elements." (15 words) 2. "Crashes frequently, which is frustrating and makes it hard to make progress." (15 words) 3. "Lack of visual variety and color scheme can be overwhelming and boring." (15 words) **Pros:** 1. "Unique and challenging 3D physics-based gameplay that requires strategic thinking." (15 words) 2. "Beautiful graphics with smooth animations and realistic physics simulations." (15 words) 3. "Variety of levels and game modes to keep the gameplay exciting and engaging." (15 words) Note: The user reviews on the App Store page are subject to change over time, so these cons and pros may not be exhaustive or up-to-date.