Two factory versions of the plexiglass backglass are known to exist. One is silkscreened to allow illumination of status indicators such as Ball in play, Game Over, Match, etc. The other has no silkscreening and displays no indicators. Pictured in this listing are the reverse sides of both versions. This game is popularly considered as the largest pinball machine ever made. However, we do not know the full measurements of its electromechanical predecessor, Bally's 1977 'Bigfoot', with which to compare. Hercules was developed by Arcade Engineering (a company consisting of past Allied Leisure employees). See the Bally's 1977 'Bigfoot' listing for the story.