Based on the user reviews on the apple app store, here are three cons and pros of the Mahjong Solitaire Challenge app: **Pros:** 1. Addictive gameplay: Users praise the app's engaging and challenging mahjong solitaire experience. 2. Unique features: The app's special features, such as the ability to earn rewards and compete with friends, are highly praised. 3. Excellent graphics: Users appreciate the app's visually appealing graphics and animations. **Cons:** 1. In-app purchases: Some users feel that the app's in-app purchases are aggressive and annoying. 2. Limited levels: Users have reported that the app's level selection is limited, leading to boredom and repetition. 3. Ads interference: A few users have complained that the ads in the app interfere with their gaming experience.