Flappy Bird, the immensely popular app on iOS and Android has been taken down by the developer for reasons unknown yet. So, I’d recommend you to not delete the app in case you’ve already have it.
But, if you haven’t downloaded the app when it was available in the Google Play Store there is a way because one of the best features of Android is that users can side-load apps which are not available in the Play Store.
The instructions are simple, download Flappy Bird for Android .apk file onto your Android phone and install it.
If you’re on iOS, you’re out of luck.
Remember, Flappy Bird is still frustrating. Although with the update for the game a few days ago the frame rate had been increased for a smoother game play.