Which mobile commerce innovation first allowed free-to-play games to become financially viable in the gaming industry?

The gaming industry has undergone massive transformation with the integration of mobile commerce. From in-app purchases to virtual economies, mobile commerce has redefined how gamers interact with virtual worlds and how developers monetize their creations. Test your knowledge about this crucial intersection of gaming and mobile commerce that drives billions in revenue annually.

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Microtransactions for cosmetic items and character skins
In-app purchases for virtual currencies and power-ups
Subscription-based gaming services on mobile platforms
Ad-supported gameplay with rewarded video advertisements