The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Radu Ziemba:
Tubby ,a little tube wants to get his revenge on all the birds that smashed into him!Get your revenge now as Tubby is very angry!!Game features:-->12 types of badges!-->Game center included!-->Half new , "half old " graphics since everybody "loves" the Flappy bird game so much!-->Master the game till the next patches where every bird you skip and every medal you get will get stored in you profile!Instructions-->tap the screen and rocket your way up!-->avoid the endless waves of birds!