Beast Below: Slot Overview

Anyone with thalassophobia may want to keep a safe distance, because developer Hacksaw Gaming is heading into the vast ocean depths with Beast Below. Even calling it “blue” feels generous—this is a gloomy, murk-filled underwater realm where who knows what’s hiding in the darkness. What we do know is that sirens and divers play key roles, tying directly into Beast Below’s feature set, which includes expanding wilds and plenty of multiplier potential, among other mechanics.

As for the “beasts” themselves, the sea life occupying Beast Below’s reels might be harmless—or not—but they certainly look sharp enough to avoid. You wouldn’t want to step on one while snorkelling and end up bleeding in shark territory. The atmosphere is distinctive: shadowy, slightly cartoonish, and faintly sinister. It’s definitely not a Canny the Can-style romp, yet it’s also not one of Hacksaw Gaming’s outright nightmares, even with that constant sense of something lurking nearby. With that in mind, let’s move carefully—will the depths deliver danger, or treasure? Time to find out.

One of the worst things a diver can do is panic and shoot up to the surface, risking the bends—hardly an enjoyable outcome. Beast Below can call for a similarly steady approach thanks to its medium-high volatile math model (rated 4 out of 5), although volatility can vary depending on which bonus buy is selected. Beast Below offers four separate feature buys, and the betting range runs from 10 p/c to $/€100 per spin. In regular play, the maximum RTP players can expect is 96.29%, though this can shift when a bonus is purchased.

Those prickly ocean dwellers appear on a 5-reel, 4-row layout with 14 fixed paylines. The aim is to connect matching symbols along a payline from the leftmost reel, landing at least 3 adjacent reels. The paytable combines 10 to A card ranks as low symbols and 5 deep-sea creatures as the premium ones. A 5-of-a-kind win pays 2 to 3 times the bet for the royals or 5 to 10 times the bet for the fishy high pays. Anchors act as wild symbols and can appear on any reel. Wilds substitute for any regular pay symbol, or they pay 20 times the bet for a 5-wild line.

Beast Below: Slot Features

Feature-wise, Beast Below shares a fair bit of DNA with several earlier Hacksaw Gaming releases. That said, there are fresh touches too, and the main additions to note are Expanding Sirens, the Siren’s Call Bonus Game, the Down Below Bonus Game, and the bonus buy options.

Expanding Sirens

Sirens are wild symbols that expand upwards to the top of their reel, provided the expansion would make the enlarged symbol part of a winning combination. Expanded Sirens show a multiplier value of 2x to 200x, which is applied to any win they contribute to. If multiple Expanded Sirens are involved in the same win, their multipliers are added together before being applied. Only one Siren can land on a reel at any given time.

The Siren’s Call Bonus Game

Hitting 3 FS scatter symbols in the base game activates this round and awards 10 free spins. While the feature is running, there’s a greater chance of landing Siren symbols compared to the base game. A Pink Siren symbol can also appear. Once expanded, Pink Sirens remain on their reel but nudge up one row on every following free spin. Pink Sirens can carry values of x2 to x200. Landing 2 FS symbols grants +2 free spins, while landing 3 FS symbols grants +4 free spins.

Down Below Bonus Game

Landing 4 FS scatter symbols in the base game starts this feature with 10 free spins. This is where the Diver symbol can show up. When it lands, it expands into a full Diver reel, acting as a wild multiplier with a value of x2 to x200. Diver reels begin with 3 Oxygen Charges and, at the start of a spin, can move to an adjacent reel by spending 1 Charge. Once charges hit 0, the Diver is removed. Up to 3 Divers may be present on the grid at the same time, and if more than one is used in a win, their values are added together. Landing 2 FS symbols awards +2 free spins, or landing 3 FS symbols awards +4 free spins.

Buy Bonus

The bonus buy menu allows players to choose from the following ways to play Beast Below:

• BonusHunt FeatureSpins – 3x the bet where each spin is 5 times more likely to trigger a bonus game. Very highly volatile with a max RTP of 96.29%.
• Siren FeatureSpins – 50x the bet for a spin guaranteeing at least 2 Sirens land. Very highly volatile with a max RTP of 96.32%.
• The Siren’s Call Bonus Round – 120x the bet. Very highly volatile with a max RTP of 96.27%.
• Down Below – 200x the bet. Highly violative with a max RTP of 96.31%.

Beast Below: Slot Verdict

Beast Below sits alongside earlier Hacksaw Gaming titles such as Stormforged, Temple of Torment, and Cursed Seas. Each of these plays with expanding wild multipliers in its own way. The studio is well known for taking a core concept, reshaping it from different angles, stretching it, and experimenting until it either feels refreshed or evolves into something else entirely. To stop that process from becoming predictable, Hacksaw Gaming also excels at building striking game worlds that highlight its imagination and knack for feature design.

Beast Below feels like a trip into a less explored corner of the world—exactly the kind of place where Cthulhu might emerge from the depths, much like in H P Lovecraft’s classic The Call of Cthulhu. ‘We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far.’ That mood fits well here, and players who prefer Hacksaw Gaming’s darker flavour over its more cartoon-forward slots should enjoy the pelagic setting Beast Below offers. It should also appeal to anyone who liked the expanding wild gameplay found in the three titles mentioned above, since that’s largely what Beast Below focuses on too. As with its relatives, strong multiplier moments can happen here—either from single wild multipliers or when multiple wild multipliers stack their power within a win. The Diver mechanic is also one of Beast Below’s more distinctive ideas, and it’s worth checking out if you enjoyed what came before. The Divers’ ability to roam can genuinely change outcomes—helpfully when a Diver Reel shifts toward a win, and less helpfully when it looks like it’s drifting away from them.

That kind of unpredictability is exactly what online slots thrive on, and Hacksaw Gaming knows how to lean into it. With Beast Below, the studio has done so effectively: it may not be the most groundbreaking release on a purely mechanical level, but between the excellent presentation, newer touches like the Diver and the nudging Pink Siren, fans of Hacksaw Gaming get another well-crafted, slick-scaled slot to put to the test.