Forget Fortnite! A 16-year-old's simple Roblox game, 'Grow a Garden', just shattered gaming records with 21.3 million players. This wasn't luck, learn how it mastered human psychology, built a cooperative community, embraced radical simplicity, and carved out a 'blue ocean' market. It proves authentic, user-centric design beats big budgets for viral, sustained engagement. A blueprint for modern marketers.