title: Custom Score Challenges in Game Center
body: <p>Currently my app has a functioning leaderboard and I am trying to implement challenges but game center seems to only have challenges to "Beat my score" and that is really not that interesting. Is there any tutorials or information someone can give me to make custom challenges such as "First one to get 10,000pts" or "most points in a single day" ? Any help would be very appreciated. Thanks</p>