High Quality Content by WIKIPEDIA articles! Desktop Tower Defense (DTD) is a Flash-based browser game of the tower defense game genre created by first-time game designer Paul Preece in March 2007. The game had been played over 15.7 million times as of July 2007, and was one of Webware 100`s top ten entertainment web applications of 2007. DTD is available in an English, Spanish, German, French, or Italian interface. In May 2009, a commercial Nintendo DS version exists and is heavily based on the Flash game.