Desktop Tower Defense is a Flash-based browser game of the tower defense game genre created by first-time game designer Paul Preece in March of 2007. In the span of a few months, the game had been played over 15.7 million times as of July 2007. The game was among one of Webware 100's top ten entertainment web applications of 2007.

Wikipedia : http://en.wikipedia.org/wiki/Desktop_Tower_DefenseGame Game : http://www.handdrawngames.com/DesktopTD/game.asp