Boulder Bucks Slot Review
by Light & WonderReleased Apr 27, 2016
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Boulder Bucks is a Barcrest stake-threshold slot where 3 scatters open the UPick bonus, letting you choose between Mammoth full-reel wilds, Pterodactyl side-expanding wilds or Sabre-Tooth persistent wilds. Egg picks and a Big Bet assist round it out.

Specifications
| Game Type | Slots |
|---|---|
| RTP | 94.09% |
| RTP Range | 94.09-98.00 |
| Volatility | Medium-High |
| Max Win | 500x |
| Grid | 5x3 |
| Paylines | 10 lines |
| Min Bet | $0.1 |
| Max Bet | $500 |
Boulder Bucks Slot Overview
A cartoon stone-age slot in which the player's own decisions are worth more than in almost any other game on the shelf. The bonus asks you to choose, and choosing badly gets expensive. Boulder Bucks is unusually blunt about how expensive, because it publishes six return figures instead of one.
Played well it returns 94.09% below a 2.00 stake, 96.13% at 2.00 or above and 98.00% in Big Bet mode. Played at random, those same three modes return 86.00%, 81.28% and 77.91%. That is nearly fifteen points of return at ordinary stakes and twenty points in Big Bet, handed back for clicking through the bonus without thinking. Barely any slot makes a player's choices worth that much. Fewer still print the number where anyone can read it. What the game never prints is the rule for getting it right, and the decision carrying all of that weight is the collect-or-reject inside the free spins.
There is a cliff in the stake ladder too. Bet 1.90 and the game runs at 94.09%; bet 2.00 and it runs at 96.13%. One penny for two points of return, signposted nowhere in the game. The default stake is 0.10, so it opens every session on the wrong side of that line.
Theme & Design
Turquoise sky, red rock buttes, a volcano smoking on the horizon, palm fronds hanging into both top corners and a strip of green grass along the bottom. The interface is stacked orange sandstone all the way through: the button surrounds, the plaques holding stake and lines, the frame around the reels. Royals are chiselled rock standing on little bases, a yellow J, a magenta 10, a green Q, a red A, and they read cleanly at a glance, which matters on a ten-line game where wins are easy to miss.
The picture symbols are broader. A cavewoman in a spotted fur dress waving at nobody in particular, a caveman shouldering a club, a purple long-necked dinosaur posing under a moonlit sky, a cracked white egg sitting in a gold ring. This is old cabinet art and it looks it, the bright plasticky 3D that Light & Wonder inherited from the Barcrest catalogue rather than drew fresh. Charming in a dated way. The Barcrest badge parked between BALANCE and TOTAL WIN on the bottom bar tells you exactly which lineage this comes from.
Symbols & Paytable
| Symbol | Payout |
|---|---|
| Lowest royal band (two symbols) | 0.5x / 1x / 5x for 3/4/5 below a 2.00 stake; 0.5x / 1x / 4x at 2.00 and aboveAll figures are multiples of the total bet. The whole table shrinks once you cross the 2.00 threshold, even though the return climbs. |
| Middle royal band (two symbols) | 1x / 2x / 10x below 2.00; 1x / 1.5x / 5x at 2.00 and aboveThe five-of-a-kind halves above the threshold. |
| Top royal | 2x / 4x / 15x below 2.00; 1.5x / 2x / 7.5x at 2.00 and above |
| Lower picture symbol | 3x / 5x / 20x below 2.00; 2x / 2.5x / 10x at 2.00 and aboveThe game never prints which artwork sits on which row, so these are pay bands rather than named characters. |
| Middle picture symbol | 3x / 10x / 40x below 2.00; 2x / 5x / 20x at 2.00 and above |
| Top picture symbol | 5x / 20x / 50x below 2.00; 2.5x / 10x / 25x at 2.00 and aboveTop award halved above the threshold, three-of-a-kind halved too, and the return still goes up two points. The extra comes from features arriving more often, not from the reels paying more. |
| Wild | No award of its own; substitutes for everything except the two feature symbolsReels 2, 3 and 4 only, so it cannot start a line or complete a five-of-a-kind. |
| Boulder Bucks | No line award; three of them start the UPick free spinsReels 1, 3 and 5 only. |
| Egg Hunt symbol | No line award; scattered eggs start the Egg Hunt Pick MeReels 2, 3 and 4. |
Features & How They Work
Wilds that live on the middle reels only
The wild lands on reels 2, 3 and 4 and nowhere else, substituting for everything except the two feature symbols. Lines pay left to right from reel 1, so no wild can ever start a win. Reel 5 is closed to it as well, so no wild can finish a five-of-a-kind either. It patches the middle of a line and that is the whole of its job.
One exception, and it is the sharpest idea in the game. Pterodactyl Spins runs side-expanding wilds, which turn every position to the left of the wild wild as well: land one on reel 2 and reel 1 goes wild, land one on reel 4 and reels 1, 2 and 3 all go with it. That variant is the only route in the entire game to a wild on the reel every win has to begin on. Reel 5 stays shut in all three variants.
UPick free spins, and the reject button
Boulder Bucks symbols turn up on reels 1, 3 and 5 only, and all three landing together award 1, 2 or 3 selections. Each selection buys a pick from three free-spins games. The one you pick plays out in full, and then you either collect the win or reject it and spend another selection on a different game. Each of the three can only be chosen once per entry.
Mammoth Spins gives 20 free spins with expanding wilds that fill their whole reel. Pterodactyl Spins gives 10 with the side-expanding version. Sabre-Toothed Tiger Spins gives 6, and its expanding wilds stay locked in place for the rest of the round. Twenty spins against six, three different wild behaviours, and a button that throws a finished win away. That is the decision those published return figures are really measuring.
Egg Hunt Pick Me
Scattered eggs on reels 2, 3 and 4 open a short pick round that pays either a multiplier or a way into the free spins. There is a trap in it worth knowing before you touch Big Bet: in the standard game that multiplier is a multiple of the total stake, but in Big Bet it is a multiple of the stake per line. Same multiplier, a tenth of the money.
Big Bet, Boulder Smash and Mega Boulder Smash
Big Bet is a package of five linked spins bought for 20.00 or 30.00. Wins accumulate across the five and land in one lump at the end, all ten lines run on every spin, and the free spins can trigger on any of them.
The 20.00 version adds Boulder Smash: if Boulder Bucks land on reels 1 and 3 but miss reel 5, a pick round hands you a shot at the bonus anyway. The 30.00 version adds Mega Boulder Smash, which fires on any two of the three scatter reels and puts the pick on whichever reel missed. Both are near-miss insurance, and the dearer one is strictly broader, covering three near-miss shapes where the cheap one covers a single specific pair.
Screenshots

How Boulder Bucks Plays
The base game is thin and it knows it. Ten lines on a 5x3 grid, carved letters most of the way down, and a wild that can only ever patch the middle means plenty of spins end with three matching symbols and a shrug. Dry stretches are the norm. That is the price of a game keeping most of its return locked inside a bonus.
What changes the rhythm is that the bonus is not a cutscene. Most slots hand over free spins and you sit and watch. This one hands you a choice, then hands you a second choice after you have already seen what the first one paid, and the reject button can feel like a mistake the moment a decent Mammoth run gets binned in the hope of something better. That tension is rare, and it probably carries the game further than the reels ever do.
Big Bet plays like something else entirely. Five spins, no pauses, everything settled at the end. A 20.00 stake gone in about fifteen seconds of reel time. It is a pub-machine format transplanted into an online game, and if you have never fed a Barcrest cabinet in an arcade, the pacing takes some getting used to.
Pros & Cons
Pros
- Both award tables and all six return figures are published, so nothing about the maths has to be guessed at
- The UPick bonus asks the player to decide something, with a reject button and three free-spins games that behave differently
- Side-expanding wilds in the Pterodactyl round are the one place a wild can reach reel 1, and a smart bit of design in a game that otherwise plays it safe
- 98.00% in Big Bet played well is a high number for any format
Cons
- Nothing in the game flags the 2.00 stake threshold, and the default 0.10 stake opens you on the worse table
- The base game is thin, and a wild locked to reels 2, 3 and 4 can neither start a line nor finish one
- Big Bet quietly switches the Egg Hunt multiplier from a total-stake base to a per-line base
- Art and presentation are a good decade behind current releases
Is Boulder Bucks Worth Playing?
The maths disclosure is the reason to look at this one. A game that tells you what careless play costs, in points, and puts twenty of them on the table in Big Bet mode, is doing something almost nothing else on the shelf bothers to do. It just never tells you what good play looks like. That gap is the game's biggest weakness and its most interesting quality at the same time.
The rest is ordinary Barcrest. A 5x3 grid, ten fixed lines, stakes running from 0.10 up to 500.00, art from another era, and a base game that mostly waits. The ceiling wants a flag too: the top prize is a flat cash cap of 250,000 rather than a multiple of the bet, which at the 500.00 maximum stake works out at only 500x. That is a weak ceiling on the biggest bet the game will take. Lower down the cap is so far away it never comes into play at all.
Worth the time for the bonus decision and for the rare honesty of a published number. Set the stake to at least 2.00 before the first spin.
Frequently Asked Questions
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Reviewed by Arina, PR & Content Manager
PR & Content Manager at SlotsReach
Published 12 Aug 2026 · Updated 12 Aug 2026