Business Insider: Flappy Bird, the latest mobile craze, launched less than one year ago. At its peak, it was generating about $50,000 per day. It was run by one man, Dong Nguyen, an indie game developer in Vietnam.
If you've never played, Flappy Bird is simple: You tap your smart phone's screen to keep the bird afloat, and you steer him through a maze of pipes. Each pipe you successfully pass through gives you one point. If you hit a pipe, you die. The bird is very hard to navigate, so the game is frustrating to many players.