Which product design innovation did Duolingo pioneer that revolutionized language learning apps by increasing user retention by over 40%?

Language learning platforms have revolutionized how people acquire new languages, moving from traditional classroom settings to interactive digital experiences. The design of these products has evolved significantly over the years, incorporating various features to enhance user engagement and learning outcomes. Test your knowledge about a groundbreaking design innovation that transformed the language learning app landscape!

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Gamification with skill trees, XP points, and streaks to create habit-forming behavior
AI-powered speech recognition that evaluates pronunciation in real-time
Peer-to-peer language exchange matching system
Immersive VR environments for conversational practice