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Can anybody tell me the best game that can be played on Mac through Steam? Portal 2 and Age of Empires series seem to be a no go, along with a lot of good games.

I'm looking for a game to to get addicted to so that the hours can just fly by, to maximise non-productivity.

No first person shooters. RTS would be great, but not sure I'd have the bandwidth for something like Starcraft. Sequoia 15.6 (24G84). 8 GB 2133 MHz LPDDR3.

Thanks