Gamekit and Game Center sample from Apple

Question

For some reason, all the Apple's links to Gamekit samples are broken. I am looking for Apple's Gamekit and Game Center sample code.

Answer 1

https://developer.apple.com/library/ios/samplecode/gktapper/Introduction/Intro.html

Try out this one. It's a bit old, though.

What specifically are you interested in? I bet there are a ton of tutorials that cover it.