The Sims 3 for Xbox 360

Global Threat – Lead your squad in fierce battles to defeat the alien threat, and rescue civilians in crowded cities and desolate outlands around the world.
Strategic Base of Operations – 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