Which language learning platform pioneered the gamification approach with its famous tagline 'Making language learning addictively fun'?

In the world of language and linguistics, brand recognition often hinges on clever wordplay, neologisms, and linguistic innovation. Major language learning platforms and dictionary companies have created distinct brand identities that connect deeply with their audiences. This poll tests your knowledge of how linguistic products have revolutionized their marketing through innovative brand strategies. Can you identify the correct linguistic branding breakthrough?

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Duolingo
Rosetta Stone
Babbel
Memrise