Which unique subscription model feature did Brilliant.org pioneer that revolutionized how interactive mathematics problems are presented to users?

Educational technology has revolutionized how we learn mathematics, with subscription-based platforms offering specialized content. These platforms employ various strategies to engage users and promote mathematical thinking. This poll tests your knowledge about one of the most successful mathematics subscription services and its innovative approach to teaching complex concepts.

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Progressive problem sets that adapt to user skill level using machine learning algorithms
Gamified monthly mathematics competitions with cash prizes for subscribers
Virtual reality geometry modules requiring special headsets included in premium subscriptions
Blockchain-verified mathematics credentials that employers can access via subscription API