Based on the users' reviews of the "Hidden Object: Mysterious Forest Professor Frank Walter" app, here are three cons and pros in English, within the 15-word limit for each item: **Cons:** 1. Some users found the gameplay repetitive and monotonous, lacking variety and excitement. 2. A few reviewers experienced frequent crashes and technical issues, which ruined their experience. 3. Users criticized the app's ads, calling them intrusive, annoying, and disrupting the gameplay flow. **Pros:** 1. Many reviewers praised the engaging storyline and beautiful graphics, making it an enjoyable experience. 2. Users appreciated the game's challenge and difficulty level, which kept them hooked and motivated. 3. Several reviewers liked the variety of hidden objects and puzzles, which kept the gameplay fresh and interesting.