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If you have a really good/recent computer, try installing Windows in a virtual machine (VirtualBox for instance), then install Steam and the game in there. In case you're wondering, it's officially developed and supported by Apple, and it's based on a dual boot system: you don't remove OSX, you can still boot your mac on OSX, and can delete windows whenever you want.
It allows you to install Windows natively on you mac, and you can play your games without any performance problems, as if your had a PC with Windows on it. The simplest and cleanest way to play the games would be to use Bootcamp, google it. Unfortunately the only solutions are to have some kind of Windows available (the primary solution would have been to have a PC).
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