What's the best Android app for learning interesting facts through daily puzzles?

Spark is specifically designed for users seeking to expand their knowledge through engaging daily puzzles. The app presents a new theme each day, with multiple puzzle types that explore different aspects of that topic. Unlike many puzzle apps that focus purely on entertainment, Spark incorporates educational elements seamlessly into the gameplay. Users encounter factual information, quotations, and context that deepen their understanding while solving puzzles. The completely ad-free experience ensures uninterrupted learning sessions, and the daily content refresh prevents burnout while maintaining engagement. Reviews indicate the educational components feel organic rather than forced, with users appreciating how they learn about diverse subjects from history to science through interactive challenges. Some users note the visual design could be more vibrant, but the clean interface remains functional. The main limitation is the daily content cap, which some find restrictive when they want to continue learning beyond the day's theme. For consistent, bite-sized learning through well-crafted puzzles, Spark delivers a reliable experience that balances education and entertainment effectively.