After analyzing the user reviews of the PuzzleNation Sudoku app, I found the following three cons and pros: **Cons:** 1. **Limited game variety**: Some users feel that the game selection is limited, with too much repetition. 2. **Glitches and freezes**: Users have reported experiencing technical issues, such as glitches and freezes, during gameplay. 3. **In-app purchases**: Some users feel that the app's reliance on in-app purchases can be frustrating and feel pushy. **Pros:** 1. **Engaging and addictive**: Users praise the app's ability to be engaging and addictive, making it hard to put down. 2. **Customizable difficulty**: Users appreciate the option to customize the game's difficulty level to suit their skills. 3. **Daily puzzles and rewards**: Users enjoy the daily puzzles and rewards, which provide a sense of accomplishment and progress.