The 2-player version of this game is Gottlieb's 1974 'Duotron'. We previously showed a date for this game of August 1974. The new date is per Gottlieb documentation. Pictured in this listing is an exported Sample game with serial number 01154 S. It does not have inserts at the top three rollover lanes or at the flipper inlanes to represent A-B-C, instead using painted red letters. The copyright notice is below the left flipper and not in the blue area above the bonus ladder, and the outlane B and C inserts have nearby text entirely on a blue background instead of half blue and half red. This Sample game also was never equipped at the factory with a chime unit and having no mounting holes in the cabinet wall prove this. The owner, located in the UK, recalls he got the game from either Holland or Germany. For more information about factory non-installation of bells and chimes in USA games exported to Europe, see our Notes for Bally's 1969 'Cosmos'.