It does require broader similarities than green pipes. And Nintendo is on record that Flappy Bird does not violate their IP.[1] [1] http://blogs.wsj.com/digits

It does require broader similarities than green pipes. And Nintendo is on record that Flappy Bird does not violate their IP.[1] [1] http://blogs.wsj.com/digits/2014/02/10/no-complaints-about-flappy-bird-nintendo-says/ http://blogs.wsj.com/digits/2014/02/10/no-complaints-about-f...