Riddle me this: when is a trailer no longer a trailer? The answer, as it turns out, is not now. If you want to get up-close-and-personal with XCOM: Enemy Unknown‘s extraterrestrial antics, the demo’s still (mostly) your best bet. But if, for some reason, you can’t play it (say, because you find it intimidating, don’t currently have a functional gaming PC, or recently became a horse), this is probably the next best thing. It’s basically a “choose your own tutorial,” but it does a solid, easily understandable job of breaking down the basics. Click some buttons and watch things happen after the break.