Which innovative market research technique did Epic Games use to gather player feedback during Fortnite's early development that revolutionized their design approach?

In the competitive world of gaming and virtual worlds, understanding market research techniques can separate successful products from failures. This trivia tests your knowledge about a groundbreaking market research approach that revolutionized a major game developer's understanding of player behavior and preferences. How well do you know the innovative research methods that shape the games we play?

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Biometric response tracking during gameplay sessions
Silent data collection via gameplay telemetry without player knowledge
Paid focus groups with professional gamers only
Real-time social media sentiment analysis during beta launches