I thought they just changed the color of the pipes. Well if they did the reason is that Nintendo was threatening to sue them for copyright. The green pipes are also found in the classic Super Mario Bros by Nintendo.
A man got 99 as a score. He was aiming for 100. He committed suicide. The app artist thought that if someone killed themself, then it was WAY too addictive! The app artist is definitely a good lady, because she chose to save lives, than to get $50,000 a day! Yeah! That's how much she was making!