Win XCOM: Enemy Unknown Gameplanet

THREATENED BY AN UNKNOWN ENEMY, the Earth’s governments unite to form an elite paramilitary organisation, known as XCOM, to combat this extraterrestrial attack. As the commander of XCOM, you control the global defense team in a battle against a terrifying alien invasion by creating a fully operational base, researching alien technologies, planning combat missions, and controlling soldier movement in battle.
To celebrate the launch of XCOM: Enemy Unknown, we're giving away three copies of the game on your choice of platform! To be in to win, simply answer the question above, then choose either PC, PlayStation 3 or Xbox 360. In addition to the game, every winner will receive an XCOM: Enemy Unknown t-shirt and an XCOM: Enemy Unknown keyring.