Which psychological principle did Fortnite brilliantly leverage to generate over $9 billion in revenue through its Battle Pass system and limited-time cosmetics?

The gaming industry has mastered the art of player engagement through sophisticated psychological techniques. From reward schedules to social proof mechanics, game designers implement strategies that keep players coming back for more. This poll tests your knowledge about one of the most powerful psychological phenomena used in modern game design that has revolutionized monetization strategies and player retention across the industry. Can you identify the correct psychological principle that has transformed how games are developed and marketed?

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The FOMO (Fear Of Missing Out) effect, creating urgency through time-limited exclusive items and events
The Zeigarnik effect, leaving narrative threads unresolved to maintain player interest between seasons
The endowed progress effect, giving players starter rewards to create artificial advancement and commitment
The mere exposure effect, repeatedly featuring cosmetics in gameplay to increase player desire for ownership