Bison Bonus Slot by Genii

The base game has a random event called the Bison Stampede. Without warning, a herd thunders across the screen kicking up dust, and when the dust settles a handful of Wild bison heads have been dropped onto random reel positions. There's no scatter trigger or symbol combo behind it, it just fires when the math says it fires, which keeps the otherwise quiet 30-line base from going stale between feature hits.

The route into Free Spins runs through a Pick round. Land 3 or more Feature symbols (a sunset bison silhouette in a wooden plaque) and you stop spinning to choose tiles, each hiding two values: the number of Free Spins you're getting and the number of Roaming Random Wilds that come with them. Once Free Spins begin, every Wild on the grid converts to a Roaming Wild, repositioning to a fresh random spot at the start of each spin. So the Wilds you walked in with stay with you for the whole round, just never in the same place twice. No retrigger, no buy option.

One detail worth knowing: the regular Scatter pays separately from any line wins, on top of whatever the paylines deliver, and it pays out as 2 to 5 coins multiplied by your total bet for 2 to 5 scatters. It only appears in the base game though, so during Free Spins those scatter coins are off the table. The Feature pick scatter also sits out the bonus round.

Visually the game leans woodland-cartoon rather than dust-bowl Western. The reels sit inside a wooden post structure wrapped in green vines, with a sunny blue sky, fluffy cumulus clouds, and a pine treeline behind. J/Q/K/A letters are carved from coloured wood. A grinning fox and a pair of prairie dogs handle the character symbols, with the bison itself reserved for Wilds and the Feature plaque. The max win sits at 4,150 coins, which works out around 46x your total bet, a deliberately low ceiling that matches the casual tone. This is a small win, frequent hit kind of build, not a chase-the-dragon machine. For anyone who wants more from the Genii catalogue, the same Pick-into-Roaming Wilds structure shows up across a few of their animal-themed titles, with Bison Bonus sitting on the calmer end of that family.