Based on the user reviews on the Apple App Store, here are three cons and three pros of the Gravity Stacker app, each limited to 15 words: **Cons:** 1. "Too many ads interfere with gameplay, disrupting the flow and increasing frustration." 2. "Lack of challenge diversity makes the game feel repetitive and unengaging." 3. "No option to customize levels or difficulty, restricting replay value." **Pros:** 1. "Addictive physics-based gameplay that's both challenging and rewarding to solve." 2. "Simple yet elegant graphics make the app visually appealing and easy to use." 3. "Great time-waster for short periods, perfect for breaking up daily routines." Please note that these conclusions are based on a limited set of user reviews and may not represent the experience of all users.