Introversion's strategic "genocide-'em-up" Defcon is now available to buy off the Internet or in one of those boxes, and you can download a demo to celebrate. Or: to discover if you feel like buying it.
You can buy the game via Steam or Introversion's website, and you can grab the demo from Valve's download service or just use the regular Internet. It's only 58MB - and if you buy it that's how big the full download is, too.
According to them wot know, the demo consists of a rolling demonstration of the game, a tutorial, and a playable multiplayer bit with support for two players. The full game supports up to six of you humans.
For more info, check out our preview, interview, videos and so forth elsewhere on the site, and watch out for a review very soon.