XCOM: Enemy Within takes the incredible experience from XCOM: Enemy Unknown and adds an array of new abilities, upgrades, and weapons to combat new enemy threats. The expansion also provides players with all-new maps, tactical and strategic gameplay, and multiplayer content. There is no better way to experience XCOM than with the massive amount of new content added in XCOM: Enemy Within. Fans will experience an additional three to four playthroughs on average before encountering all of the new material included in XCOM: Enemy Within, providing nearly limitless replayability.
More information.
More information.