XCOM: Enemy Within is an expansion pack for the acclaimed turn-based tactical strategy game XCOM: Enemy Unknown, designed specifically for iPhone users. This full version introduces new gameplay elements such as gene modifications for soldiers, enhancing their abilities, and the creation of MECs (Mechanized Exoskeletons), which serve as formidable robotic combatants. Players can harness the resource Meld to unlock these advanced features during tactical missions, adding depth to the gameplay experience.

In addition to the new soldier enhancements, XCOM: Enemy Within also enriches the game with a variety of new maps, expanding the tactical options available to players. Multiplayer modes are included, allowing for competitive play against others. This standalone expansion not only builds on the original game’s mechanics but also introduces fresh strategies and challenges, making it a compelling addition for fans of the series.