Adjustable for either Replay, Add-a-ball, or Novelty operation. The add-a-ball only version of this game is Williams' 1970 '3 Jokers'. The backglass is silkscreened to show 1,000,000 points above the score reels. The backbox insert is equipped with two lamps to illuminate this score. However, the lamp sockets are not wired from the factory, nor is there a 'One Million Relay' installed to light them, therefore this feature does not operate. Only the electrical return path is present, factory-wired from these sockets to a nearby score reel socket. The schematic diagram shows the missing wiring represented by a dashed line for both lamp and relay, and shows an End-Of-Stroke Switch on the 100,000 score reel to have operated the relay via the 9th Position switch. (Williams used the term "drum unit" in place of "score reel".) The game we investigated had no EOSS on that drum unit. The manual does not mention a 'One Million Relay'. Because we know that other models such as Williams' 1970 'Gay 90's' used dash lines on the schematic to represent an optional "Extra ball wiring kit" consisting of a relay cabled to a connector plug, we might have assumed Williams offered this "One Million" feature as a kit, although it seems unlikely that the operator would have been expected to install not only the EOSS but also the wiring to this switch and to the lamps, instead of everything pre-wired to a convenient factory-installed cable connector jack. More information is needed to understand why Williams would acknowledge on the schematic this feature that is only partially installed in the game. We note that 1969-1971 was a period of transition for Williams from games with just four score reels to games showing five or six reels, with 'Straight Flush' being one of only four games during this transition that had six reels, until Williams finally settled on five reels in 1971. Williams did not return to six score reels until Williams' 1976 'Aztec'. Interestingly, a Sample 'Straight Flush' backbox insert was found on a '3 Jokers' game, and this insert never had lamp sockets for 1,000,000 points.