Based on the users' reviews, here are three pros and three cons of the Mahjong Alchemy app: Pros: 1. "Engaging gameplay with varying difficulty levels keeps me hooked and entertained." 2. "Beautiful graphics and intuitive interface make it easy to play and relax." 3. "High score system and daily challenges provide a sense of accomplishment and purpose." Cons: 1. "Some levels are too easy, while others are too difficult, leading to frustration." 2. "In-app purchases for hints and power-ups can be expensive and frustrating." 3. "Limited social features and no multiplayer option for users who like to compete." Please note that these are general summaries based on the user reviews, and individual opinions may vary.