Flappo Bird.

Games As per usual because I don't have a smart phone, I didn't discover Flappy Bird until it was taken down. Lucky I can still play, albeit in the Atari 2600 version:

"With the introduction of the mobile app "Flappy Bird", a simple game of keeping a bird flapping through obstacles grew into a worldwide phenomenon, earning upwards of $50,000 a day in ad streaming during the game. The developer, Nguyen Ha Dong, surprised the world when he announced that he was pulling the application down, citing discomfort with the addictive nature of the game. In its wake, a variety of clone games arrived, and this Atari 2600 port serves as another one, albeit with a completely different approach and on a much simpler system."

I am a leaf on the ... ack ....