go into cydia, and download "Ifile"

open up Ifile,

Tap the back button until your all the way at the beginning of Ifile, [ Register or Signin to view external links. ]

once your at this screen [ Register or Signin to view external links. ]
scroll down until you see "Var" once in that folder click "mobile" and click applications

once in the applications folder you should see a bunch of folders with long numbers and letters for the names, Click this one [ Register or Signin to view external links. ]

Go into flap.app and then tap on atlas.txt and open it up with "Text viewer"

Now we should be on a page with a bunch of coding before we do anything click "Edit" in the top left corner.

Scroll down until you see "Pipe_Down" and find the number "270" highlight that number and hit the back button on your keyboard.

After the number 270 is deleted type in a very low number such as three. [ Register or Signin to view external links. ] make sure your screen looks something like that,After that's done hit "Done" on your keyboard and hit "Save" in the top right corner

completely exit out of Flappy bird by double tapping the home button and swiping up on flappy bird.

Make sure your phone looks like this [ Register or Signin to view external links. ]

Enjoy