Based on the user reviews, here are three pros and cons of the app: **Pros:** 1. "Challenging and addictive puzzles that improve logical thinking and problem-solving skills." 2. "Variety of game modes, including classic Sudoku, Killer Sudoku, and irregular-shaped boards." 3. "Beautiful graphics and smooth gameplay make it a pleasure to play for hours." **Cons:** 1. "Some levels are too easy or too hard, leading to frustration and boredom." 2. "No option to undo moves, forcing players to start over if they make a mistake." 3. "Occasional freezing or crashing issues on lower-end devices or during complex puzzles."