Yes you can, there are just different steps to install it.
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The Sims 3 is on PC, Mac, IPone/Ipod Touch, and Console (PS3, XBOX 360, Wii, DS, 3DS).
As Sims 3 requires a Mac with an Intel processor it will not run on a Mac with a G5 processor.
Sims 3 is available for Mac OS X. You will have to buy a mac specific disc though.
You can't. You can only use cheats in The Sims 3 for PC or Mac.
Yes. But you have to get the mac version. PC obviously doesn't work on a mac. Yeah pretty much it...