Playfield 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'. Also later produced as Premier's 1984 4 player 'El Dorado City of Gold'. We have increased our confirmed production run quantity to include 16 Sample games produced in 1975 that were not part of the former quantity per handwritten documentation identified by Wayne Neyens as coming from Bob Malvasio, a draftsman for Gottlieb whose initials RHM can be found on schematics.