XCOM: Enemy Unknown (No Manual)

From the makers of Civilization comes a game about Civilization's last stand.

You are our last hope. As the Commander of an elite paramilitary organization known as XCOM, you control Earth's defenses against a terrifying alien invasion.

Global Threat: Lead your squad in fierce battles against the alien threat and rescue civilians in crowded cities and desolate outlands around the world.

Strategic Base: Build and expand your XCOM headquarters, recruit and develop unique soldiers to take into battle, and research alien technology to expand your weapons and capabilities.

Tactical Multiplayer: Mix and match aliens and soldiers, and combine abilities to outsmart and overpower your opponent.