Which language learning app famously launched in 2011 with a gamified approach and reached over 500 million users by 2020, revolutionizing accessible language education?

In the world of language learning and linguistics, product launches can significantly impact how we learn and interact with languages. One particular language learning platform made waves with its innovative approach and rapid user adoption. Test your knowledge about this famous linguistic product launch that revolutionized language learning accessibility.

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Duolingo
Rosetta Stone Mobile
Babbel
Memrise