I play EB, M2TW all with max video settings etc on a 2 year old 24" iMac using a bootcamp partition with windows xp. For everything else I use MacOS. I have had windows pcs and will never buy another if I can help it.
Anyway, to the OP, you can indeed play games on a Mac (and they look great) but you need to bootcamp windows. For this, you need a windows install disk: the bootcamp part is free with the MAc OS. The process is fairly easy to follow.
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