Rumble Rumble Bison
About this machine
The Curved Reel series has been a staple for Ainsworth across multiple markets. Rumble Rumble Bison can be configured as a Standard or Mystery Progressive game.
Description sourced from the manufacturer's public product page.
Rumble Rumble Bison on video
Real footage of this machine — 6 clips whose title names it. We index them; the videos live on YouTube. More on YouTube ↗
Artwork & cabinet
Where Rumble Rumble Bison sits in Ainsworth's range
Rumble Rumble Bison is part of Ainsworth's Rumble Rumble line, which runs to 4 documented titles. Manufacturers ship a hit as a family rather than one box, so entries in a series share branding and often a bonus structure while carrying different maths.
Why Rumble Rumble Bison doesn't have an RTP in the usual sense
This machine is designated HHR — historical horse racing. Despite the reels on the screen, it is not running a slot maths model at all: each play is a parimutuel wager settled against the archived result of a real horse race that has already been run, with identifying details stripped out.
That distinction is what lets these machines operate in states that never legalised slot machines — Kentucky, Virginia, New Hampshire and Wyoming among them. It also changes where the money comes from: payouts are funded from a wagering pool shared with other players, not from a fixed theoretical return set by the manufacturer.
So the honest answer is that the return depends on the pool and the takeout rate the operator applies, not on a par sheet inside this cabinet.
Reels, symbols and bonus animations on an HHR machine are a presentation layer over the race result. Ainsworth builds the cabinet and the presentation; the wagering system underneath is regulated as parimutuel racing.
Where to play
We don't yet have verified floor placements for this machine. Our casino cross-reference covers 442 properties, but only through IGT's public linked-progressive data — which doesn't reach Ainsworth titles. We would rather show nothing than guess.
Rest of the Rumble Rumble line
All 4 Rumble Rumble machines →4 titles carry this branding. They share artwork and usually a bonus structure, but each ships its own maths.
Other Class II machines from Ainsworth
Class II titles run on a shared bingo draw rather than an independent RNG — a different product category, not just a different game.
