Which innovative market research technique did Fortnite developer Epic Games primarily use to rapidly iterate on battle royale features during its early development phase?

In the competitive gaming industry, understanding how companies gather player insights can reveal their product development strategies. This trivia tests your knowledge of innovative market research techniques used by major gaming companies to shape their virtual worlds and experiences. Do you know how the industry's leaders truly learn what gamers want?

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Telemetry data analysis with heat maps showing player movement and engagement patterns
Traditional focus groups with casual gamers from different demographics
Sentiment analysis of game reviews across multiple gaming journalism sites
Eye-tracking studies to determine visual attention during gameplay sessions