As the first side-scrolling shooter, Defender is one of the most influential and most popular games ever created. Even though it was deemed by some as too complicated due to its unique five-button control system, it shares honors with Pac-Man as the highest grossing videogame of all time, earning more than one billion dollars in revenue. Gameplay involves piloting a ship around a mountainous alien landscape while rescuing humanoids and shooting (right and left) at landers, mutants, bombers and other enemies. The ship is equipped with smart bombs and hyperspace, and a scanner positioned at the top of the screen helps players track offscreen enemies. Colorful graphics, explosive sound effects, and intense shooting action makes Defender challenging and loads of fun.