Which gaming platform first introduced the 'Robux' virtual currency that became one of gaming's most successful digital payment systems, generating over $2 billion in revenue by 2021?

The gaming industry has pioneered innovative monetization strategies, particularly with virtual currencies and in-game purchases. These digital payment systems have transformed how players engage with games and how developers generate revenue. Test your knowledge about one of the most successful virtual currency systems that revolutionized free-to-play gaming and set standards for digital retail in virtual worlds.

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Roblox
Minecraft
Fortnite
Second Life