I followed this tutorial in order to test my game on the Xcode iOS simulator with Ejecta...
scirra.com/tutorials/627/how-to-export-to-ios-with-ejecta
but when I start my game inside Xcode it says:
?This game is not recognized by game center.?
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Had a similar problem. Is required switch to the sandbox mode in the settings of gamecenter on your device