Game developer Dong Nguyen released the mobile game Flappy Bird in 2013. By the end of January 2014, it had become the most popular free app in the iOS App Store. A month later Nguyen removed the game from platforms, believing it to be too addictive. The sudden removal drove up prices for cell phones with the game preinstalled. “I think it had become a problem,” said Nguyen. “To solve that problem, it’s best to take down Flappy Bird. It’s gone forever.”