But Flappy Bird took off several months after its launch with such ferocity that at one point Nguyen was said to be earning $50,000 per day from the app--an annualized rate of over $18 million.

Like Flappy Bird, players must keep the ball afloat by tapping the screen. But here’s the twist: Players can only pass through sections of the obstacle that match the color of your ball.

Flappy Bird features a small bird that users must propel through a series of tubes by tapping on the screen. If the bird touches any surface, it dies and the game ends. The point is to earn the ...

When Nguyen released the game in 2013, he had no visions of it becoming a viral gaming success.It only took him a few days to make. But Flappy Bird took off several months after its launch with ...