American Bison Slot Video - RETRIGGER, RETRIGGER, RETRIGGER!
American Bison is an interesting game where you win by landing the same symbol on 2 or more adjacent reels from left to right starting with the leftmost reel, depending on the symbol. To help, wild symbols may land on reels 2, 3 and 4 and may be randomly transformed into 2x or 3x wilds.
The bonus is triggered by landing 5 or more Jackpot Wheel symbols for a spin of the wheel for Credits, Free Games, Progressives or Prizes with a Bonus Wheel Spin for those wedges that have a Gold background. If you trigger a Bonus Wheel spin, you then spin a secondary wheel for a multiplier between 2x and 10x to be applied to your prior award. You may also land on an Upgrade wedge which awards you another spin of a more valuable wheel!
If you land on the Free Games wedge, you are awarded a number of free games with retriggers possible for landing as little as 2 additional bonus symbols. Presumably an alternate set of reels is used during the bonus awarding some kind of advantage, Enjoy!