Ultra Stack™ – Bison Instant Trigger
About this machine
ULTRA STACK™ BISON INSTANT TRIGGER: Offers immediate feature gameplay with the highest payouts. Free game feature types are available according to play option selected. At the start of any feature, the number of bison symbols on the reels is increased for the free games regardless of play option. When playing the game at higher play options, the top symbol is further increased via a wheel spin. Choosing the highest play option, automatically triggers one of the free game features.
* Please note not all cabinets are available in all regions.
Description sourced from the manufacturer's public product page.
Looking for Ultra Stack™ – Bison Instant Trigger footage
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Below are other Aruze Gaming machines — not this one — in case you want a feel for how the manufacturer's games play.
Artwork & cabinet
Where Ultra Stack™ – Bison Instant Trigger sits in Aruze Gaming's range
Ultra Stack™ – Bison Instant Trigger is part of Aruze Gaming's Ultra Stack line, which runs to 7 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.
What's the RTP of Ultra Stack™ – Bison Instant Trigger?
There isn't one number — and any site quoting you a single figure is describing a different product.
Manufacturers ship the same title in multiple par versions, commonly spanning roughly 85% to 96%. The casino chooses which one to install, and that choice is not disclosed on the machine. Nevada regulation only sets a floor: every wager must theoretically return at least 75%.
What regulators actually publish is hold percentage — realised performance after player behaviour, aggregated by region and denomination. It is never broken out by game title. So the honest answer for any land-based machine is a range plus an unknown configuration, not a single figure.
Figures quoted elsewhere for this title are almost always taken from its online version, which is a different product with a different maths model.
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 Aruze Gaming titles. We would rather show nothing than guess.
Rest of the Ultra Stack line
All 7 Ultra Stack machines →7 titles carry this branding. They share artwork and usually a bonus structure, but each ships its own maths.
Most-filmed Aruze Gaming machines
All 432 Aruze Gaming machines →The titles from this manufacturer that slot channels actually put on camera.
