title: Send an object with iOS Game Center Challenge?
body: <p>I am developing an iOS game in which the player builds an object and completes a timed challenge with that object.  I want to use Game Center to allow the player to be able to challenge his friends to beat the time using the same player built object.  The time part of the challenge is easy, but how can I send the player built object with the challenge?  I know that you can send objects if the players are involved in a match, but a match doesn't really fit what I am trying to do.  If the object could be sent with the challenge as an NSDictionary (or other object), that would be the best.  Is this possible?  And if so, how?</p>