While game companies are spending millions developing and marketing addictive mobile games, every once in a while an indie hit appears out of nowhere and captures the public's imagination. In 2013, that game was Flappy Bird, a notoriously difficult endless runner-style game that thrust its Vietnamese creator, Dong Nguyen, into an unwanted spotlight.
Nguyen ended up pulling the game from Apple and Google's app stores a few months later (despite making a ton of money), because it had become an "addictive product" that was causing him and its players issues. It also allowed him to focus on making more games. With seven titles now behind him, including Swing Copters, Nguyen is back with a new game called Ninja Spinki Challenges!! -- and it's every bit as difficult as you'd expect.