You've probably already downloaded the demo for XCOM: Enemy Unknown. But if for some reason you haven't, a new trailer offers interactive elements to give an approximation of playing the game. It's not quite the same, but it'll do in a pinch.
The trailer takes you into a battle, letting you choose options like what type of team to bring, or what to do with the aliens once they're on the run. Check it out below, or read our hands-on preview for more details.