Page Tools.Welcome to the XCOM: Enemy Unknown Starter Guide! This page contains everything you need to know to get started playing XCOM and should help introduce the many in-depth sections of the XCOM: Enemy Unknown Wiki in the order they are presented in the first stages of the game.Description of XCOM: Enemy Unknown XCOM is a turn-based squad tactical strategy game fused with a real-time strategic operations simulator.The tactical game takes place on a variety of small battlefields.