Book Of Horror Slot Review
A horned figure looms at the edge of the reels, one red eye burning through the mist, and the cobwebbed frame does the rest of the talking. The genuinely arguable thing about Book Of Horror, though, is that Spinomenal have built one of the leanest Book slots you’ll find: a 5×4 grid, 10 paylines and a single feature doing all the work, with an RTP of 93.96% that asks a fair bit of patience in return. It’s Halloween dressed up as a slot, and it keeps the costume on all year round.
Sister titles like Book Of SpinOWeen, Halloween Charms and Book Of Rampage Reloaded cover similar ground, but this one strips the formula back further than any of them.
Symbols and Pays
Ten fixed paylines carry all the base game wins across the five reels and four rows, and the symbol ladder has a clear top end. The Witch is the richest payer, and she’s the one symbol worth watching for. The Book itself works as both wild and scatter, substituting for every symbol and paying its own prizes on top of any line wins.
Pays are multiples of the total bet, not the line bet:
- Witch/Woman – 2 pays 100x, 3 pays 1,000x, 4 pays 10,000x, 5 pays 50,000x
- Pumpkin Pot – 2 pays 50x, 3 pays 400x, 4 pays 4,000x, 5 pays 20,000x
- Cauldron – 2 pays 50x, 3 pays 300x, 4 pays 1,000x, 5 pays 7,500x
- Gravestone (R.I.P.) – 2 pays 50x, 3 pays 300x, 4 pays 1,000x, 5 pays 7,500x
- A and K – 3 pays 50x, 4 pays 400x, 5 pays 1,500x
- Q, J and 10 – 3 pays 50x, 4 pays 250x, 5 pays 1,000x
- Book Wild/Scatter – 3 pays 20x, 4 pays 250x, 5 pays 2,500x
Because those multiples are against the total bet, the top of the ladder is richer than it first appears. Five Witches at 50,000x the total bet is a serious hit for a ten-line game. The royals, by contrast, are thin: five of them only reaches 1,000x.
Two other symbols sit between those extremes and are worth knowing. The Pumpkin Pot starts paying from just two on a line, as does the Witch herself, which gives the base game something to aim at between Book triggers. The Cauldron and the Gravestone share identical values, effectively doubling the count of mid-tier symbols.
Wins are evaluated across the ten paylines, with the Book paying its scatter prizes in addition to any line wins.
The Scatter Wild Book
The Book is the whole engine here, as the title suggests. It counts as any symbol for line wins, and it doesn’t lose its scatter duties while doing so. Land three or more anywhere on the reels and two things happen at once: a scatter prize drops, and the free spins round begins.
- 3 scattered Books – 20x the total bet plus 10 free spins
- 4 scattered Books – 250x the total bet plus 10 free spins
- 5 scattered Books – 2,500x the total bet plus 10 free spins
Those scatter prizes are paid in addition to any regular line wins on the same spin, so a Books-heavy result can pay twice over. A single spin that lines up Witches on a payline while also landing scattered Books collects both. That’s the quiet appeal of a dual-role symbol: it never sits there doing nothing.
The bet per line stays the same as the game that triggered the round, so the feature plays at the stake you were already comfortable with.
Free Spins and the Expanding Symbol
Triggering the round doesn’t just hand over the spins. First comes a wheel showing every symbol in the game except the scatter Wild itself. One spin of that wheel decides which symbol becomes the expanding symbol for the whole round.
The pick matters more than it might look, since the symbol the wheel stops on is the one that will expand for the whole round. One wheel, one symbol, and the round plays out with what it gives you.
The expanding symbol is where the money lives. After each free spin’s result is settled, the chosen symbol expands across its reels to form new paylines on top of the existing ones. The expansion only happens when it produces a win, so there’s no dead filler. The expanding symbol pays in all active lines regardless of whether the winning symbols sit on consecutive reels, and expanded wins count separately from the original result.
That non-consecutive rule is the generous part. Two or three expanded Witches spread across the grid pay as though they lined up neatly, and because the expanded result is assessed separately, a single spin can win on the base grid and again on the expansion.
The round retriggers as well. Free spins may re-trigger and award another 10 free spins on top of whatever remains. A long round with a well-chosen expanding symbol is where this game’s best results come from.
Buy Feature
A Buy Feature button sits alongside the reels, and it does exactly what the label promises: pays a set price and drops you straight into the free spins round, wheel spin and all. It’s the same round a natural trigger delivers, including the retrigger potential once you’re inside.
Our Honest Verdict
Overall Rating: 6.4/10
Playing Book Of Horror is mostly waiting for the Book, and the gothic Halloween paint makes that waiting easier to sit through than it has any right to be. Somebody would choose this game for exactly one reason: it’s the classic Book formula with nothing extra bolted on, wrapped in one of Spinomenal’s moodier settings.
The expanding symbol’s non-consecutive payout rule is the strength, because scattered premium symbols pay like lined-up ones and retriggers grow teeth fast on the back of it. The weakness is the maths: 93.96% RTP sits below where most UK-facing slots pitch themselves, and the lean feature set gives you nothing to fall back on while it grinds.
It suits Book-slot loyalists who want the formula distilled, and Halloween fans get a properly atmospheric version of it. Anyone after variety in the base game won’t find it here. The Witch does the haunting, the Book does the work, and the fires at the edges of the reels keep burning while both get on with it.
Book Of Horror FAQs
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What is the RTP of Book Of Horror?
Book Of Horror runs at an RTP of 93.96%. -
How many paylines does Book Of Horror have?
Book Of Horror has 10 fixed paylines. -
What is the grid size of Book Of Horror?
Book Of Horror plays on a 5×4 grid of reels and rows. -
How do you trigger free spins in Book Of Horror?
Land three or more scattered Book Wild symbols anywhere on the reels. Three Books pay 20x the total bet, four pay 250x and five pay 2,500x, and each trigger awards 10 free spins. -
How does the expanding symbol work in Book Of Horror?
When free spins trigger, a wheel spins to choose one expanding symbol for the round. After each spin’s result is settled, that symbol expands to form new paylines, but only when the expansion creates a win. It pays in all active lines regardless of whether the symbols are consecutive. -
Can free spins retrigger in Book Of Horror?
Yes. Landing three or more scattered Books during the free spins round adds a further 10 free spins, with the bet per line carried over from the triggering game. -
Can you buy the bonus on Book Of Horror?
Yes, the game includes a Buy Feature button that takes you straight into the free spins round. -
When was Book Of Horror released?
Book Of Horror’s release date is 7 October 2021.
