remove Game Center game

[TS6]

I upgraded to OS X Mountain Lion two days ago and logged into my game center account. I opened a game on my mac and game center added it to the list of games on my game center. I know on iOS that you can remove a game by deleting the game and a popup asking you if you want to keep or remove yourself from the game center leader boards, but the pop up doesn't show up on my mac when I try to delete the game. Any help is appreciated.