There used to be a feature where you could play with Game Center friends. Is that still possible?
No, Dave removed it when Apple went through a prolonged period of breaking it at regular intervals, because the game wasn’t being updated enough to keep up, and he was busy with Sapiens.
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You can still play with your friends if they’re on the same network as you though. 
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There are some alternative methods…
Yeah, like PARSEC
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there’s some others as well.