Plot: Flash Element TD is a Flash-based tower defense browser game created by American developer David Scott and launched in January 2007. The game had been played over 140 million times as of March 2009. Wikipedia
Plot: Desktop Tower Defense is a Flash-based tower defense browser game created by 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. Wikipedia