answer:The “galactic edition” has the same system requirements as the base version. It just has extra videos, and a poster (stuff like that makes it “galactic,” apparently). As long as your computer meets the base requirements, you should be ok. Nowadays, CDs are all written in the same format; PCs/Macs can all read them harmoniously. When they say PC/Mac, they mean that the one disk will install Spore to a PC or Mac. The galactic edition will work in your PC just the same as the regular version. Compatibility is not an issue here. Order away!