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I've got an Air with Intel HD 5000 and it runs ok. The framerate is a bit low, but for a simulation it's fine.

That's good to know. I bought it for my pc but wouldn't mind getting a copy for my mb air.

copy? unless you want to play on two machines at the same time, you don't need it, it's steam after all

Good point. I've never played a steam game on anything but my pc so I wasn't aware I could just log into my steam account on a different computer.