Added: Mar 23, 2026
Provider:
Play'n GO
Merlin's Grimoire by Play'n GO is a fantasy slot that reworks the classic book-style formula with split symbols, expanding reels during free spins, and a headline top win of 30,000× bet. Set around a young Merlin searching for an ancient spellbook, it mixes 243 ways to win in the base game with the…
Merlin's Grimoire is a fantasy video slot built around the early story of a young wizard searching for a powerful spellbook. The tone is darker and more atmospheric than many light magic games, with stone ruins, crackling energy, and a forest backdrop shaping the mood from the first spin. Merlin appears as the lead premium symbol, while the grimoire itself becomes the key icon that drives the slot’s biggest opportunities.
Play'n GO uses the Arthurian theme well without overloading the reels with clutter. The symbols are easy to read, the magical effects are sharp, and the interface stays clean enough for players who care most about the mechanics. Merlin's Grimoire matters because it does more than repaint an old formula. It keeps the familiar book-slot foundation but changes how the reels behave once special symbols start splitting.
The game uses 5 reels and starts on a 5x3 layout with 243 ways to win. Instead of fixed paylines, matching symbols connect from left to right across adjacent reels, which gives Merlin's Grimoire a smoother rhythm than classic line-based slots. The base setup is straightforward, so new players can understand quickly how wins are formed and why some spins suddenly become more valuable than others.
The main twist is the splitting symbol mechanic. During the base game, reels 2, 3, and 4 can randomly activate and split symbols into extra positions. When that happens, the number of ways increases immediately for that spin, and even otherwise ordinary combinations can grow into stronger payouts. It is a useful change because it alters the structure of the grid without slowing the slot down with extra menus or side meters.
This means the base game has more movement than a standard book-inspired slot. You are not only waiting for wilds or scatters; you are also watching for reels that expand the number of possible connections. That extra activity keeps regular spins from feeling too flat and gives the game a more dynamic identity before the bonus feature even arrives.
The visual direction fits the Merlin theme well. Instead of presenting the wizard as an old master, the game focuses on a younger version of the character, which makes the hunt for the grimoire feel like the beginning of a larger legend. The backdrop mixes ancient stonework, glowing magic, and muted forest tones, so the slot feels mystical without becoming too dark to read on smaller screens.
Lower-value symbols are represented by colored magical emblems, while the premium end of the paytable uses themed objects and Merlin himself. The grimoire symbol is the standout because it works as both wild and scatter, giving it value in ordinary wins and in triggering the bonus feature. That dual role keeps the key symbol relevant throughout the session instead of limiting it to one function.
The grimoire symbol is the engine of the feature set. It substitutes for other symbols as a wild during normal play, and 3 or more grimoire symbols trigger 10 free spins. That already sounds familiar if you have played book-style slots before, but Merlin's Grimoire goes further by combining the trigger with reel splitting and a selected expanding symbol inside the bonus round.
Before the free spins begin, one regular pay symbol is chosen to become a special expanding symbol for the entire feature. When that chosen symbol lands during free spins, it can expand to cover a reel and pay in a scatter-style way, so the bonus round is less dependent on strict left-to-right connections. This gives the feature a different feel from the base game because the focus shifts toward larger bursts built around the selected symbol and the enhanced reel structure.
Free spins also broaden the splitting mechanic. In the base game, only the middle reels can split, but during the bonus feature all five reels can participate. That expands the layout dramatically and raises the total potential ways to win to 7,776. Retriggers are available too, adding 10 extra free spins when enough grimoire symbols land again, up to five retriggers in total. There is no hold-and-win board, no collect trail, and no link-style meter here. The slot gets its personality from splitting reels, expanding symbols, and the way both mechanics combine during the feature.
Merlin's Grimoire is commonly listed with RTP: 96.20%, and that matters because the game places much of its long-term return in feature-driven moments rather than in a steady stream of medium wins. The slot is also shown in lower configurations across an 84.20% to 94.20% range, which underlines that the math profile is closely tied to how often the free spins and reel-splitting combinations are allowed to carry the bigger share of value.
In practical play, the return is not distributed evenly between the base game and the bonus feature. The base game can produce useful hits through random splitting on reels 2, 3, and 4, and the wild scatter can help complete standard combinations, but the strongest value path is clearly the free spins round. That is where the selected expanding symbol, the wider reel participation, and the larger way count combine to create the kinds of payouts most players will associate with the slot’s headline potential.
The result is a play pattern with noticeable swings. You can see stretches of modest activity, then a single spin changes shape because split symbols create extra positions and turn a marginal setup into a stronger payout. Once free spins are active, that effect becomes more pronounced. Expanded reels, reel-covering symbol expansions, and retrigger potential all increase the chance of sharp momentum shifts, so the slot feels built around sudden surges rather than smooth accumulation.
Volatility is generally described as high, which fits the way Merlin's Grimoire behaves. The base game offers enough movement to stay interesting, but the top end is not designed to arrive often. The main advertised ceiling is 30,000× bet, and that places the slot in the category of games where patience matters more than constant hit frequency. There is no progressive jackpot attached to that headline figure; the attraction is a fixed top payout delivered through the existing features.
That also explains why the slot can feel more intense than a simpler 243-ways game. You are not relying on cascading chains, rising multipliers, or a separate jackpot meter to build value over time. Instead, Merlin's Grimoire puts most of its pressure on whether the right symbol is chosen for free spins, whether the reels split in the right places, and whether retriggers extend the bonus long enough to let the layout fully open up.
Merlin's Grimoire works well on mobile because the grid is simple at the start and the important effects are easy to read when the screen size drops. The symbols stay clear on phones, the split mechanic is visually obvious, and the interface does not crowd the reel area with unnecessary extras. That matters in a slot like this because reel transformations are central to the appeal and need to remain readable during quick sessions.
The sound design supports the theme without becoming tiring. Magical crackles, darker ambient tones, and clear trigger cues help the game feel responsive, especially when a free spins entry lands. On desktop, the artwork has more room to breathe, but the mobile version still carries the atmosphere well. For players who switch between devices, the feature set remains easy to follow with no real learning gap.
A demo is especially useful here because the mechanics make more sense when you see them happen. Watching reels 2, 3, and 4 split in the base game, then seeing all five reels take part during free spins, makes the structure of Merlin's Grimoire much easier to understand. The free version also helps you judge how often the slot gives smaller base hits compared with how much of the excitement is reserved for the feature round.
You can play the Merlin's Grimoire slot online at casinos that offer Play'n GO games. Starting with a demo first is still the better route for many players because it lets you test the rhythm, inspect the symbol behavior, and decide whether the higher-risk profile suits your taste. After trying the demo, some players decide to continue for real money because they already understand the pace and the kind of bankroll swings the slot is built around.
more games from Play'n GO can also help if you want to compare this title with other fantasy releases from the same studio. Merlin's Grimoire stands out because it keeps the familiar book trigger but adds splitting reels as a meaningful structural upgrade. That makes the demo worthwhile even for experienced players who already know the general format.
Merlin's Grimoire succeeds because it does not abandon the strengths of the classic book-slot format. It keeps the recognizable wild scatter trigger, the chosen symbol in free spins, and the fantasy storytelling, but it adds a splitting mechanic that changes the geometry of the reels and gives the slot its own personality. That is a stronger approach than piling on unrelated features just to seem busy.
Players who want a calm, low-risk slot with frequent small wins may find the pacing too sharp over a longer session. Players who enjoy waiting for stronger feature rounds, however, have good reason to pay attention. The combination of 243 starting ways, up to 7,776 ways in free spins, retriggers, and a 30,000× ceiling gives the game enough upside to feel ambitious without becoming hard to understand.
Overall, this is a good choice for anyone who likes fantasy slots with a bit more structure than a basic reskin. The theme is solid, the mechanics are easy to learn, the bonus round has real punch, and the mobile performance is reliable. Try the demo on this page first, learn how the splitting reels influence the pay pattern, and then decide whether you want to take Merlin's Grimoire into real-money play with a clearer idea of where the stronger winning moments come from.