Which language learning product launch introduced the concept of 'gamified language acquisition' that revolutionized the industry in 2011 and gained over 500 million users worldwide?

Test your knowledge about famous product launches that significantly impacted language and linguistics! The retail world occasionally introduces products, services, or platforms that transform how we communicate or learn languages. From revolutionary translation services to language learning platforms that changed the educational landscape, these product launches have shaped linguistic accessibility and language acquisition methods worldwide.

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Duolingo
Rosetta Stone Mobile
Babbel
Google Translate's Neural Machine Translation