Based on the users' reviews of the "Sniper Gun Shooter Games 2021" app, here are three cons and pros in English, with 15 words limited for each item: **Cons:** 1. In-app purchases and ads can be overwhelming and frustrating for some users. 2. The app's graphics and sound effects can be too basic for some players. 3. The game's replay value is limited, with some users encountering repeated levels. **Pros:** 1. The app's sniper gameplay is engaging and challenging, with adjustable difficulty levels. 2. The controls are smooth, making it easy to aim and shoot in the game. 3. The app offers a variety of missions and environments to keep gameplay fresh.