Unstoppable Bison Slot Review
A timber reel frame lashed with rawhide, bull horns mounted across the top, red-rock mesas rolling away under a pale desert sky. Unstoppable Bison is one of the few slots that would rather do one thing properly than offer five half-hearted ones: strip out the bison symbol and there is barely a game left, because every feature it has routes through that single animal. That’s a bold way to build a mid-volatility slot, and it’s the reason this one is worth a closer look.
It comes from Nailed It! Games, alongside Unstoppable Wolf, Stars Bonanza and Blazing Wheel 10000. Unstoppable Bison runs on a 5×4 grid with 40 fixed paylines at 96.14% RTP, medium volatility and stakes from 0.20 to 40.00, with a wheel bonus whose top prize is a 5,000x Mega jackpot. Around 23.65% of spins return a win, so the base game ticks over while the herd gathers.
Base Game & Features
This is a five-reel, four-row game with 40 fixed paylines, and the payout rules follow the classic pattern. The essentials:
- Payline wins run left to right, starting from the first reel
- Matching symbols must land adjacent to each other on a payline
- Only the highest winning combination pays on each payline
- The overall payout adds together every winning payline from the spin
- Wins are multiplied by the total bet
Wilds appear on reels two, three and four in the base game only, substituting for every symbol except Free Spins symbols and Bison symbols when a feature is triggering. The wild carries no payout of its own; it’s purely there to complete lines between feature hits.
The symbol run above the royals is pure prairie: an eagle, a lynx, a deer and the bison itself, all drawn in the same warm, glossy 3D style as the frame around them. The reel set wears its setting well, and nothing on the board looks imported from another game.
The Bison Symbol
The bison does three jobs at once. Land four of them stacked across a reel and the RESPIN! feature fires. Bison symbols can also arrive carrying a Star, and every Star feeds the collection that can set off the wheel bonus. During free spins, the bison is the only paying symbol in existence. It’s a lot of responsibility for one animal, and the game hands it over without apology.
RESPIN!
When a full stack of four Bison symbols covers a reel, the feature begins. Every Bison on the board slides to the leftmost available position on its row and sticks there. All remaining positions then respin, and any new Bison symbols that land join the sticky herd on the left.
The respins keep coming while new bison keep landing, and stop on either of two conditions: a spin brings no new Bison symbols, or the board fills with them completely. All wins are then paid out in a single award at the end. Stakes during the feature match the triggering spin, so there’s no extra cost per respin.
Because every bison that lands migrates left and holds its ground, a full board is a genuine possibility rather than a decorative flourish. Fill all twenty positions and the feature ends on its own terms, with the accumulated herd paying out as one total. Each respin is free in stake terms, so the risk sits entirely in what triggered the feature.
Stars Collection
Bison symbols sometimes land with a Star attached, and collecting Stars raises the chance of the Bonus game triggering at random in the base game. The clever part is the bookkeeping: the collection is saved per bet level, so switching from a 1.00 stake to a 2.00 stake doesn’t wipe your progress. Each bet size remembers its own collection, and returning to a stake restores the count you left there.
That per-stake memory cuts both ways. It rewards players who settle on one bet level and stay there, since their collection builds uninterrupted. Drop down to a cheaper stake during a cold run and you’re building a fresh collection at that level, not carrying the old one with you.
Unstoppable Bison Bonus Game & Free Spins
The Wheel Bonus
The Stars collection can trigger the Bonus game at any point in the base game. It’s a wheel divided into coloured segments, each tied to a different prize, and wherever it stops decides which of the four jackpots lands. Only one jackpot pays per visit, the feature ends the moment one is awarded, and all four are multipliers of the base bet:
- Mega – 5,000x the bet
- Major – 200x the bet
- Minor – 40x the bet
- Mini – 10x the bet
The ladder is steep. Each step down from Mega cuts the prize by a wide margin, and there’s no second spin once a segment lands, so what the wheel gives is all you take from it. Stakes match the triggering spin here too.
Free Spins
Free Spins symbols appear on all five reels in the base game and pay nothing themselves. Three or more of them start the feature, with the count scaling by trigger:
- 3 symbols award 5 Free Spins
- 4 symbols award 6 Free Spins
- 5 symbols award 7 Free Spins
Inside the round the reels change character completely: only Bison symbols and blank positions exist. Every bison that lands shifts to the leftmost available spot on its row and stays sticky for the rest of the feature. Unlike the RESPIN!, wins are awarded after each spin rather than held to the end, so the total builds visibly as the herd grows.
Five to seven spins is a short leash, but a board containing nothing except bison and blanks means every spin has somewhere to go. Fill enough rows and the sticky herd does the arithmetic for you. The triggering bet carries through the whole round.
Our Honest Verdict
Overall Rating: 7.7/10
Playing Unstoppable Bison is mostly a waiting game on the open plains: the base game is steady, unremarkable spinning while a meter quietly fills somewhere behind the horns. You’d choose it for that build, though, because the payoff is one of the moreish ones – watching a board fill with nothing but bison is the sort of tension slots rarely bother to earn.
At its best, in free spins, the game is genuinely gripping. Every spin either grows the herd or wastes one of a very short count, and that simplicity is the whole attraction. The downside is the pace between features: five spins for three scatters is a lean reward, and the wheel’s lower tiers pay so little that most bonus hits won’t feel like bonus hits.
This one suits the patient – players happy to graze through a slow base game for a shot at a crowded board and a long-shot Mega. If you want constant features and instant gratification, the herd will leave you behind.
Unstoppable Bison FAQs
-
What is the RTP of Unstoppable Bison?
The RTP is 96.14%, covering the game’s total expected return. -
How does the RESPIN! feature trigger in Unstoppable Bison?
Four Bison symbols landing as a stack that covers a reel set it off. All bison move to the leftmost available position on their row, stick there, and every other position respins until no new bison arrive or the board fills. -
How many free spins do you get in Unstoppable Bison?
Three Free Spins symbols award 5 spins, four award 6, and five award 7. During the round only Bison symbols and blank positions appear on the reels. -
How does the Stars Collection work in Unstoppable Bison?
Bison symbols can land with a Star attached, and the more Stars you collect, the higher the chance of the Bonus game triggering at random. Your collection is saved separately for each bet size, so switching stakes doesn’t lose progress. -
What are the jackpot prizes in Unstoppable Bison?
The wheel bonus awards one of four jackpots as a multiple of your bet: Mega at 5,000x, Major at 200x, Minor at 40x and Mini at 10x. Only one jackpot can be awarded per bonus. -
What is the minimum and maximum bet on Unstoppable Bison?
Stakes run from 0.20 to 40.00 per spin. -
Does the wild substitute for all symbols in Unstoppable Bison?
No. The wild appears on reels two, three and four in the base game only, and it substitutes for everything except Free Spins symbols and Bison symbols when a feature is triggering. It pays nothing on its own. -
Can the free spins round be retriggered in Unstoppable Bison?
No. Free Spins symbols appear in the base game only, so the round plays out on the spins it starts with – between five and seven, set by how many symbols triggered it.
