Augmented reality applications debuted almost a year ago, shortly after the iOS 3.1 update went live. Designed only for the 3GS and above, they brought the world as the futurists envisioned one step closer to reality. The apps themselves, however, still have a long way to go. We saw a few augmented reality navigation apps and several shooting range games, though that’s about it. Until now that is! An indie developer known as int13 has recently released ARDefender – a full blown castle defence style title using augmented reality technology.