How to share data among multiple iphone devices using Game Center?

NSObjects are pointers, so if you try and send it you will just send the pointer rather than the object. My suggestion is that you implement a -serialize method for your subclass, which converts your object to either a string or to numbers. Then implement a -deserialize method to do the reverse.

I can't help you with the nature of these methods, as I do not know what your NSObject contains, but only send the bare minimum of data.

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