This is HackCenter, which will be launching soon on the Cydia store. We don't know exactly why anyone would want it, but someone out there will. The bummer is that some users will start creating fake scores that will be displayed on the leaderboards for these games.
Not only will it ruin how Game Center's leader boards work, as one commenter points out on 9to5Mac, it will only cause Apple to be that much more aggressive with patching jailbreaks. There's not much use for it other than ruining the experience for the rest of the folks on Game Center.