Royal Flush (Extended Play Prototype)

The Royal Flush (Extended Play Prototype) is a 1957 Gottlieb prototype, designed by Wayne Neyens with art by Roy Parker, built as the Add-A-Ball counterpart to Gottlieb's standard replay game 'Royal Flush'. Extended Play (Add-A-Ball) games rewarded skilled play with additional balls rather than a cash payout, letting operators offer the game in jurisdictions that restricted payout machines.

The game carries a cards/gambling theme, fitting its name as a reference to the poker hand. A bill of materials examined by researcher Steve Young is dated January 12, 1957 — the same date as the BOM for the standard replay version — and lists a Delay Unit as the added mechanism, suggesting at least one prototype unit was built.

Beyond this documentation, little else is known about the Royal Flush prototype's specific gameplay details, but it is part of a small, documented set of 1957 Gottlieb Extended Play prototypes alongside games such as 'World Champ (Extended Play Prototype)'.