Pragmatic Play

Book of Monsters

Slots Video Slots Fantasy Action & Adventure Magic Book Monsters

Fantasy Book slot where Monsters become expanding Mega Symbols

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

95.5%

return to player

Volatility

High volatility

variance

Max win

5,000×

top multiplier

Min bet

$0.20

per spin

Reels

Cluster Pays lines

Player rating

4.3 ★

10 votes

DEMO Play free, no signup

Pragmatic Play

Embed on your site

4.3 / 5

10 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP8/10

RTP 95.5% → 8.0/10

Volatility9/10

high → 9.0/10

Win Potential7.4/10

x5000.00 (5000×) → 7.4/10

Features9/10

12 features → 9.0/10

Game Mechanics6.1/10

f=12 r=6 p=n/a → 6.1/10

Context signals (tie-breakers)

Layout5/10

6x6 → 5.0/10

Bet Flexibility8/10

0.2–480 (×2400) → 8.0/10

Provider Reputation7.1/10

provider avg 7.1 → 7.1/10

Popularity6.4/10

search demand p70 + proxy blend (70/30) → 6.4/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 76 — Book of Monsters by Pragmatic Play

https://slotranker.com/pragmatic-play/book-of-monsters#score

How to cite

Slot Summary

Released on March 27, 2025, Book of Monsters gives Pragmatic Play's Cluster Pays format a supersized-symbol problem to solve. Symbols from 3x3 through 7x7 can appear in the base game, while Free Spins select one Fat symbol and enlarge it as matching symbols fill its collection meter. The 95.5% RTP and high volatility sit beneath a x5000.00 ceiling, making symbol scale, not a conventional book expansion, the title's defining idea.

How It Plays

Cluster Pays replaces fixed paylines, so at least five matching symbols must touch as a group. Large symbols can occupy several grid positions and contribute their full area to a cluster.

The base sequence can change sharply when an oversized symbol lands, since one 3x3 or larger block supplies several matching positions at once without requiring a separate trigger.

Theme & Atmosphere

Book, Fantasy, Magic, and Monsters are presented through a playful horror premise rather than an ancient-tome imitation. The creature scale directly supports the expanding-symbol mechanic.

Action and Adventure enter through the escalating size of the selected Monster, while the Book framing gives the collection meter a clear bestiary-like purpose during Free Spins.

Fantasy Action & Adventure Magic Book Monsters

Features & Win Potential

Mega Symbols may appear from 3x3 through 7x7 during base play, supplying many matching positions to Cluster Pays at once. Their arrival does not require the bonus round.

During Free Spins, Symbols collection acts as Energy for the selected symbol. Matching arrivals fill its meter, and each completed Level Up increases the symbol's occupied area.

High volatility Free Spins Scatter Symbol Cluster Pays Bonus Buy Symbols collection (Energy)Additional Free Spins RTP range 96% RTP Bonus Bet Mega Symbol (3x3)Level Up

Bonus & Free Spins

Four to seven Bonus symbols trigger five to eight Free Spins. One regular symbol is selected for the round and begins as the feature's expandable target.

As matching symbols are collected, the selected Mega Symbol grows through successive sizes up to 7x7. Each Level Up grants between one and three Additional Free Spins.

Screenshots

3 gameplay frames

Gameplay screenshot of Book of Monsters (1 of 3)

Gameplay screenshot of Book of Monsters (2 of 3)

Gameplay screenshot of Book of Monsters (3 of 3)

Spec sheet

Book of Monsters at a glance.

Identity

Slot nameBook of Monsters

StudioPragmatic Play

Released3/27/2025

Math

SlotRanker Score76

RTP95.5%

VolatilityHigh volatility

Max win5,000×

Bet range$0.20 – $480.00

Player rating4.3 / 5 · 10 votes

Format

Reels6

PaylinesCluster Pays

Layout6x6

Features

Themes

Expected average based on this slot's 95.5% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$3.60

Cost per session$3.60

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Book of Monsters? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: High

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (High). The model is calibrated so the average return equals this slot's published RTP (95.50%), with wins capped at its top multiplier (5,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Book of Monsters

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Compare Book of Monsters with other games

	Book of Monsters Score 76This game	Monsterville Secrets Score 84	The Spell Hunters Score 68	Eldritch Dungeon Score 90	Jack and the Beanstalk Score 84
Identity
Studio	Pragmatic Play	Ino Games	Spinoro	Print Studios	NetEnt
Released	3/27/2025	10/22/2024	8/8/2022	7/22/2024	11/12/2013
Math
RTP	95.5%	96.04%	94.05%	96.1%	96.3%
Volatility	High volatility	Medium/High	High volatility	High volatility	High volatility
Max win	5,000×	12,500×	20,800×	20,000×	3,000×
Format
Reels	6	5	5	7	5
Layout	6x6	5x3	5x3	7x7	5x3
Paylines	Cluster Pays	243	40	0	20
Min bet	0.2	0.2	0.4	0.1	0.2
Max bet	480	50	80	5	100
Features
Progressive	—	—	—	—	—
Wild symbol	—	✓	✓	✓	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	✓	—	✓	✓
Bonus game	—	—	✓	✓	✓
Respins	—	—	—	—	✓

Every number is shown as a delta against Book of Monsters.

Comparing against

Book of Monsters

Pragmatic Play

RTP

95.5%

Max win

5,000×

Score

+ Wild+ Multiplier+ Bonus Game

Jack and the Beanstalk

+ Wild+ Multiplier+ Bonus Game+ Respins

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01When was Book of Monsters released?

Pragmatic Play released Book of Monsters on March 27, 2025. It is a high-volatility Cluster Pays game with a x5000.00 maximum win.

02How do wins form in the base game?

A win requires a cluster of at least five matching symbols. Oversized symbols from 3x3 through 7x7 may also land during an ordinary spin.

03How are Free Spins triggered?

Landing between four and seven Bonus symbols awards between five and eight Free Spins, with one regular symbol selected for the feature's growth mechanic.

04What happens when the selected symbol grows?

Matching symbols fill a collection meter until the selected symbol increases by one size level. Each growth step also awards between one and three Additional Free Spins.

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