But with about 25,000 new apps going online every month, Flappy Bird was lost in the mix and seemed like a bust – until, eight months later, something crazy happened. The game went viral. By February, it was topping the charts in more than 100 countries and had been downloaded more than 50 million times. Nguyen was earning an estimated $50,000 a day. Not even Mark Zuckerberg became rich so fast.