The replay version of this game is Williams' 1971 'Doodle Bug'. An earlier game having a captive ball scoring feature similar to the Doodle Bug is Bally's 1938 'Paramount'. A solid-state game having this feature is Williams' 1981 'Solar Fire'. The common "Over The Top" backbox version has four actual score reels plus one dummy reel. The 100,000 digit is a silkscreened "1" that is lit from behind when earned. Pictured in this listing is an Early Production game with serial number 70580 and with an actual score reel in the 100,000 position, just like the flyer game. It has a silkscreened 1,000,000 light in place of the words "Over The Top" as does the flyer game. The backbox has a wooden box chime instead of a metal bell. It also has a replay unit with its numbered wheel removed and, although this unit is disabled by the nearby Mode option set to Add-a-Ball, we don't know if this unit would operate if the Mode was set to Replay.