Based on the users' reviews of the "Riddles - Brain Teasers Quiz" app, here are three cons and three pros in English, with 15 words limited for each item: **Cons:** 1. Some puzzles are too difficult, leading to frustration and lack of engagement. 2. Limited variety in puzzle types and themes can get repetitive and boring. 3. In-app ads can be intrusive and distracting, disrupting the overall experience. **Pros:** 1. The app provides a great challenge to improve critical thinking and problem-solving skills. 2. The puzzles are cleverly designed, making them fun and entertaining to solve. 3. The app offers a fair number of free puzzles, making it accessible to casual users. Note: The reviews are a mixed bag, with some users praising the app's challenging puzzles and others criticizing its limitations and ads.