Bullshark Games has not built a huge Merlin universe, and that is exactly why the line feels focused rather than padded out. The studio, founded in 2023, has spoken openly about wanting each release to bring a fresh mechanic instead of just repainting an old one. In that broader catalogue, the Merlin’s titles stand out because they became Bullshark’s main scatter pays experiments, built around 6x5 grids, mystery symbols, global multipliers and free spins that can suddenly turn a quiet round into something much heavier. The result is a small series, but not a throwaway one. It already has a clear identity, and it shows how the developer likes to build pressure first and then let the feature work do the real talking.
What makes the Merlin’s line worth separating from the rest of the Bullshark library is not simply the wizard theme. Plenty of studios borrow familiar fantasy material and end up with another interchangeable magic slot. Bullshark took a different route. In both Merlin’s Alchemy and Merlin’s Mania, the key engine is not a standard reel set with a token bonus stapled on top. Each game at unionjackpots.org.uk is built around symbols that transform, multipliers that either grow or apply in layers, and bonus rounds that feel like extensions of the base logic rather than a separate machine. That internal consistency gives the line a bit of backbone. It also helps explain why these two releases are usually the first Bullshark titles mentioned when the studio’s more ambitious mechanics come up.
Merlin’s Alchemy turns arcane theory into a hard-edged feature chase
Merlin’s Alchemy arrived on 30 January 2024 and immediately planted its flag as the sterner, more exacting entry in the line. Officially it runs on a 6x5 grid with scatter pays, which means there are no standard paylines at all. A win lands when at least eight matching symbols appear anywhere on the screen. Bullshark rates it at 4 out of 5 for volatility, with a default RTP of 96.25 per cent, a hit rate of 24.84 per cent, and a maximum win of 10,000 times the stake. Those numbers already tell the story pretty well. This is not the breezier half of the series. It is the one that asks for a quiet spell, then tries to hit with a much sharper swing once its mechanics line up.
The plot is simple, but it works because the game sticks to it without overcomplicating things. Merlin is not treated here as a generic robe-and-staff figure wheeled out for fantasy wallpaper. He is framed as an alchemist, someone trying to turn raw material into something richer and stranger. That feeds directly into the symbol set and the feature design. The game is built around transformation, not just decoration. Mystery symbols do not exist as filler. They are the heart of the slot, the unstable ingredient that can reveal regular paying symbols, wilds, activator wilds, sticky activator wilds during the bonus, or the potion effects that start pushing the global multiplier into serious territory.
The bonus structure is where Merlin’s Alchemy starts to show its teeth. Green potions add values to the global multiplier, from 1x all the way to 100x. Red potions multiply that global figure, from x2 up to x10. Activator Wilds then use the current multiplier when they contribute to a win, which creates a clean but nasty bit of arithmetic: first the multiplier grows, then the right wild has to arrive in the right moment to convert that number into an actual payout. In practice, that means the slot spends a lot of time building expectation around the idea that the next reveal could be the one that flips the whole sequence. It is a neat bit of design, because the tension comes from combination rather than from any single symbol doing all the heavy lifting.
The free spins round, titled Spellbook Free Spins, keeps the same logic but removes one of the brakes. Three, four or five scatter symbols trigger 8, 10 or 12 free spins respectively, and the odds of landing mystery symbols increase during the feature. The big twist is that the global multiplier starts at 1x and does not reset between the cascading sequences of the bonus. That one rule change alters the whole temperament of the game. In the base mode, multiplier growth can feel temporary and fragile. In the feature, it becomes cumulative pressure. Sticky Activator Wilds also enter the picture here, staying in place until the end of the bonus and repeatedly applying the multiplier when they take part in wins. That is the point where Merlin’s Alchemy stops feeling like a tidy scatter pays slot and starts behaving like a full-on compounding machine.
Another small but important part of Merlin’s Alchemy is its pacing. The game does not flood the player with noise every round. It prefers to make the mystery symbol the event. Because of that, every reveal matters more than it would in a busier slot. A bag turning into a wild is useful. A bag turning into an activator wild after the multiplier has already been inflated is where the game really starts grinning. That measured rhythm suits the theme well. It gives the feeling of a process unfolding in stages, like an experiment that could either fizzle out or suddenly produce a very expensive result. In the context of Bullshark’s early catalogue, it was a smart second release and a strong declaration that the studio was willing to push structural mechanics, not just surface ideas.
Merlin’s Mania makes the same wizard far less restrained
If Merlin’s Alchemy is the controlled laboratory, Merlin’s Mania is the same spellbook after somebody has kicked the door open. Released on 26 November 2024, the second Merlin slot keeps the 6x5 scatter pays layout but shifts the balance of the experience. Official figures put it at 3 out of 5 for volatility, with a default RTP of 96.31 per cent, a hit rate of 35.77 per cent, and a maximum win of 12,000 times the stake. That profile matters. The sequel is technically less volatile than Alchemy, yet its top prize climbs higher. It is built to be more active, more generous with visible movement, and a touch less severe before the real damage arrives.
The narrative set-up is looser and more playful. Merlin returns with stronger magic, but the core appeal again comes from what the mechanics do with that idea rather than from any broad fantasy dressing. Every spin can bring between 2 and 30 mystery symbols, and all revealed paying symbols match. That already gives the slot a more immediate sense of volatility in motion, because the screen can suddenly turn from ordinary to loaded in a single reveal. During the base game those mystery symbols may become standard payers, regular wilds, adder wilds or activator wilds. In the free spins they can also reveal sticky activator wilds, which is where the feature begins to stack its pressure.
Merlin’s Mania simplifies part of the formula while making another part more explosive. The global multiplier begins at 1x in the base game and resets with each new spin, so there is less of the long-burn accumulation that defines Merlin’s Alchemy. Instead, the slot leans harder on immediate feature interaction. Adder Wilds raise the global multiplier before the win is calculated, with possible additive values from 1x up to 100x. Activator Wilds then apply the current global multiplier to the wins they touch, and if several activator types appear in the same sequence, their effects stack together. The design is not subtle, but it does not need to be. Merlin’s Mania wants each winning event to feel as if it might suddenly break wider open than expected.
Its two bonus rounds are also cleaner and more readable than the Alchemy feature set, which is one reason the sequel feels broader and more accessible. Wizard’s Favor starts with 3 scatters and awards 8 spins. Merlin’s Insanity starts with 4 scatters and awards 10 spins, but with a starting global multiplier of 5x instead of 1x. In both cases the multiplier keeps growing through the entire feature, and every extra scatter adds another spin. That makes retriggers more meaningful than a routine top-up. They do not just extend screen time. They extend the life of a multiplier that is already in motion, and that can be a huge difference in a game where activator wilds and sticky activator wilds are waiting to convert that build-up into actual cash value.
There is also a tonal difference between the two Merlin titles that matters more than it first appears. Merlin’s Alchemy feels like a slot where the player watches a system slowly assemble itself. Merlin’s Mania feels like a slot where the system is already live and just needs one clean shove. Its higher hit rate supports that impression. Things happen more often, the mystery reveal volume is larger, and the free spin ladder is easier to grasp at a glance. Yet it still carries a 12,000x ceiling, which keeps it from drifting into lightweight territory. In simple terms, it is the more sociable game of the pair, but it still has enough bite to avoid feeling soft.