Gottlieb introduced Neptune at a time when Solid State games were becoming all the rage. Even though it is an electro-mechanical pinball machine, the mechanical reels are black with red letters. This was Gottlieb's attempt to give the EM machine a Solid State Look. Very few, 270, Neptunes were produced. It is the Add-A-Ball version of Gottlieb's "Hit The Deck". There is also an Italian version that features nudity that was produced by Giuliano Lodola.