Based on the user reviews of the app "Sudoku 9x9", here are three pros and cons: **Pros:** 1. Easy to use interface helps new players learn and enjoy Sudoku quickly and easily. 2. Unique features like daily challenges and a statistics section keep gameplay engaging and fun. 3. Variety of difficulty levels and puzzle sizes appeal to both casual and experienced Sudoku enthusiasts. **Cons:** 1. Ads can be intrusive and disrupt gameplay, becoming annoying for some users. 2. Limited customization options for game settings and difficulty levels can be frustrating. 3. Some users have experienced crashes or freezing issues, requiring restarting the app. Please note that these are general summaries based on the user reviews, and may not reflect the full range of opinions on the app.