Does the Game Center feature in Mountain Lion just support games purchased in the Mac App Store? I imagine games must also need to be coded to make use of its features. So currently there probably is not much working with it? I do have some games bought in the App Store but unless they get updates I don't expect any of them will work with Game Center. I guess I can hope developers might add support but I wonder how inclined they might be to do that for existing titles versus upcoming ones. Lastly, most of my Mac native games are on Steam. I don't suppose there is any support of those in Game Center is there? Thanks for any info. I am interested in this new feature but pretty in the dark about what it actually does and works with.