Which psychological principle was primarily responsible for the massive success of the 2016 Pokémon GO phenomenon that had millions of people walking around catching virtual creatures?

Pop culture products don't become sensations by accident! Behind many viral products are carefully crafted psychological triggers designed to create emotional connections and drive consumer behavior. This trivia question explores a fascinating consumer psychology technique that helped create one of the most memorable product crazes in recent pop culture history. Test your knowledge about what really drives our purchasing decisions!

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The FOMO (Fear Of Missing Out) effect, as limited-time special events and region-specific Pokémon created urgency and social comparison
The endowed progress effect, where players felt they'd already made progress toward collection goals from the moment they started
The nostalgia factor, leveraging emotional connections to the brand from childhood combined with new technology
The reciprocity principle, as the free-to-play model created feelings of obligation to make in-app purchases