Most addicting

Flappy Bird

Available: May 2013-February 2014 Downloads: 50 million

Flappy Bird gained traction in January 2014 when it became the #1 free app on iTunes. But by February 9, 2014, the game was gone. The creator claims to have taken the game down due to the negative impact the fame brought him and for the app’s highly addictive nature. After that, phones with the game already installed were selling for hundreds and even thousands of dollars.