Based on the users' reviews of Chain Balls app, here are 3 cons and 3 pros in English, with each item limited to 15 words: **Pros:** 1. "Innovative gameplay keeps me engaged for hours, perfect for brain training and relaxation." 2. "Simple yet addictive design, love the combination of puzzle-solving and chain reactions." 3. "Excellent mobile performance, no lag or glitches experienced, smooth gameplay overall." **Cons:** 1. "Some levels are frustratingly difficult, requiring too much repetition and frustration." 2. "No option to turn off sound effects, annoying for those who prefer quiet gaming." 3. "Limited level selection, could use more variety and challenges to keep players interested." Please note that these conclusions are based on a summary of the users' reviews and may not reflect the opinions of all users.