XCOM: Enemy Unknown

Used but in excellent condition. Comes with game disc and manual.

Face an alien enemy powerful enough to unite all the governments on Earth against it in this strategy classic from the makers of Civilization. When an alien horde descends on our planet, every militarized nation unites to form an ultra-elite fighting force that will band together for humanity's last stand. Command the multinational force and plot the strategy to save mankind. Establish your central command base, map out combat missions, and deploy your troops on the battlefield.