The Retina display offers rich detail, vibrant colors, and razor-sharp text. To ensure that your iOS and Mac apps look their best, you’ll need to optimize icons, custom controls, and other artwork. When you submit your app, you should also include high resolution assets for the App Store. Learn more .
Game Center is Apple’s new social gaming network that allows your users to invite friends to play a game, start a multiplayer game through auto-matching, track their achievements, and compare their best scores on a leaderboard. Learn everything you need to know about developing your apps for Game Center, from understanding the fundamentals to updating your Game Center app once it’s on the App Store. Log in to the iOS Dev Center