What's the best Android app for improving problem-solving skills with fun challenges?

Clever is a comprehensive brain training app that effectively blends entertainment with cognitive development, making it a strong choice for users aiming to sharpen problem-solving abilities. The app features a wide array of games, including pattern recognition puzzles, mathematical challenges, and spatial reasoning tasks, which are designed to simulate real-world problem-solving scenarios. For instance, professionals can use it for quick mental warm-ups before work, while students might integrate it into study breaks to maintain focus. Specific features like timed challenges and adaptive difficulty levels help users progressively build skills, and the inclusion of IQ tests offers benchmarks for tracking improvement over time. Reviews indicate that many users appreciate the variety, with one noting that the puzzles prevented mental stagnation during daily commutes. However, some feedback points to occasional advertisements interrupting gameplay, which can detract from immersion. Additionally, while the free version is robust, advanced features require in-app purchases, which might not suit all budgets. Despite these minor drawbacks, Clever's structured approach and engaging content make it a reliable tool for consistent mental exercise. Regular updates introduce new puzzles, keeping the experience fresh and aligned with user expectations for long-term use.