Hmmm... This is really strange. The game runs fine on both my 2013 macbook air and my 2016 macbook pro. If you don’t mind my asking, what type of mac are you using?
If you’re talking about the model (from what I found on it) it is a ‘20-inch, early 2008’. Aside from that, I don’t really know. I’m not that great with computers lol
