Game Center
Game Center has become a must-have feature for many mobile gamers across the world. You can connect and compete with friends and even meet new people who like the same games you do. And it all started with iOS 4.
Although the Game Center app wasn’t as robust as it is today, it was useful enough for developers to start adding this feature to their games – users could check leaderboards, earn achievements, and host multiplayer matches with either friends or random players from around the world.