This was the last pin produced by Mylstar and production was continued by Premier. It is also the last game designed by Ed Krynski for Gottlieb/Mylstar. The models for the explorers on the backglass were two Gottlieb employees, Jeri Knighton and Jeff Lee (Gottlieb video game artist). In the 1970's, this playfield layout was produced by Gottlieb as a 1 player replay version called 'El Dorado', an Add-A-Ball version called 'Gold Strike', an Add-A-Ball version for Italy called 'Lucky Strike', a 4 player replay called 'Target Alpha', a 4 player replay game made only for France called 'Canada Dry', and a 2 player replay called 'Solar City'. Unlike the above list of EM games, this SS version used a 3-inch flipper bat for its upper left flipper instead of a 2-inch flipper bat.