I don't play that much games on my Mac Pro. Most of my game playing is now on Xbox, especially Halo 2 on Xbox Live. But last week Iconfactory and ARTIS released Frenzic, a cross between the classic Tetris and Bejeweled. I paid for the Guru Bundle license after just 5 minutes of play time. It is that addictive!
The scores are uploaded to Frenzic's web site along with all the other players. I am ranked 66th as of this moment. I really can't imagine how other people can get score higher than 2000, let alone 6654!
I dare you to try it out. Just beware the time you will be spent playing it!