Based on the users' reviews, here are three pros and three cons of the "Emoji Challenge" app: Pros: 1. "Fun and engaging way to learn new emojis and their meanings." (15 words) 2. "Love the daily challenges and the variety of emoji puzzles." (15 words) 3. "User-friendly interface and creative emoji designs make it enjoyable." (15 words) Cons: 1. "Some emojis are hard to recognize, leading to frustration and errors." (15 words) 2. "Limited game modes and lack of variety in challenges is disappointing." (15 words) 3. "In-app purchases for extra lives and hints felt too expensive and greedy." (15 words) Note: The reviews are based on the Apple App Store ratings and may not be representative of all users' opinions.