XCOM: Enemy Within turns your agents into undercover spies | Polygon

Polygon: "In August, 2K announced XCOM: Enemy Within, a 'Firaxis-style' expansion loaded with new weapons, items, maps and ways for players to ramp up the tactical aspects of last year's XCOM: Enemy Unknown. In a recent hands-on demo, the company revealed more additions to the game's strategy, including more resources and new mission types — along with a perilous new enemy."

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