Plot: Offroad Thunder is an offroad racing arcade game released in 1999. It forms part of Midway's Thunder series of racing games, which also includes Hydro Thunder, 4 Wheel Thunder, and Arctic Thunder and is itself an evolution of Off Road Challenge. Wikipedia
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