Which gaming loyalty program innovation first introduced the concept of "Battle Pass" that revolutionized free-to-play monetization and player retention?

In the competitive world of gaming and virtual worlds, loyalty programs have evolved dramatically to keep players engaged. These programs now go far beyond simple point systems, incorporating complex behavioral analytics, exclusive virtual goods, and community-driven rewards that create powerful emotional connections to game worlds. Test your knowledge about one of the most innovative loyalty transformations that changed how games retain their player base.

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Fortnite's Battle Pass (2017)
Dota 2's Compendium/Battle Pass (2013)
League of Legends' Event Pass (2018)
PlayerUnknown's Battlegrounds Survivor Pass (2018)