Multiplayer integration

I'm sure all of us remember sitting down in front of our old CRT TV with a friend and loading up Super Mario 3 (blowing on the cartridge before inserting it to ensure that it works) and playing together for hours on end.

Then, the split screen multiplayer was introduced and that blew everyone's minds. "We can play together at the same time? We don't have to take turns? Awesome sauce!"

Now, we are in the age of Bluetooth/online multiplayer games. No more are we sitting down with friends in the same room to play our games; no, we are antisocial now. That's not an issue though; it does leave a smaller mess to clean up when you're done playing. This is what will integrate—multiplayer with matchmaking—and it will be so cool!

In order to do this, however, we do need to enable and integrate Game Center into our game. To start doing this, let's open up our project in Xcode. With our project selected on the left-hand side, click on the Capabilities tab in the center of the screen...