Well, here's a great hack for all Game Center players, this hack will allow you to send any score you want to any game in Game Center, this hack called "Hack Center", it will be available at Cydia soon, in the below embedded video you will see how to use HackCenter to submit a fake score for "Fruit Ninja".
  *** UPDATE   ***
As much as I appreciate the personal attacks, with everyone calling me a douchebag and whatnot, I decided that due to the overwhelmingly negative response to this video I will NOT be releasing HackCenter to ANYONE. Just to be clear, this was not meant in any way to hurt the jailbreaking community, or to spur a cheating rampage. It was just made for FUN. JUST FOR FUN. That is all.