XCOM: Enemy Unknown is a turn-based tactical strategy game that incorporates role-playing elements and it is a reimagined remake of X-COM: UFO Defense. The game is set in the near future when Earth is invaded by aliens. The player is put at the head of the elite multinational military organization XCOM (Extraterrestrial Combat Unit) tasked to defend Earth against the invaders as regularly military actions remain without result. This is done through a series of missions where the player commands a small troop. Between missions the larger management aspect is tackled through research and development to create new technologies and weapons using captured aliens and technology recovered from the missions. That way, the underground HQ is expanded to have a larger reach with new structures and the player is also responsible for the management of finances and monitoring alien activity. Players also need to keep panic under control. If a certain region of country is left unattended for too long, the local government will cut back its contributions to the XCOM funding, slowing down the overall progress. There are also often cut-scenes that further an overall story.

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