Which psychological principle did Fortnite specifically leverage in its battle pass system to maximize player retention and spending?

The psychology behind game design has evolved significantly in the last decade, with developers using sophisticated behavioral science techniques to enhance player engagement and retention. From reward schedules to environmental storytelling, modern games are carefully crafted experiences that tap into fundamental human motivations and cognitive processes. Test your knowledge about how gaming companies leverage consumer psychology to create more compelling virtual worlds!

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The IKEA Effect - players value items more when they've invested effort to unlock them through battle pass progression
The Zeigarnik Effect - players remember uncompleted battle pass tasks better than completed ones
The Dunning-Kruger Effect - players overestimate their ability to complete the battle pass in time
The Mere Exposure Effect - players prefer battle pass items simply because they see them more frequently