The Callisto Protocol: How to Unlock the Commonality Achievement - Gameranx

Duncan Cole is the result of a years-long project to make the most conspiratorial human on record. From the moment he shows up in The Callisto Protocol, he’s obviously up to something, but the game’s a little cagey about exactly what. There are a couple of secret rooms found over the course of the game …

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The Callisto Protocol: How to Unlock the Commonality Achievement - Gameranx