Book of Monsters
Certified by the HGC (HGC-028710-TM)
Data source: iGaming Tools (11 June 2026)
Free play · rotates to fullscreen
Demos are only available to people aged 21 and over.
Demo provided by the game studio via iGaming Tools. Free play only, no real money.
How it playsHow Book of Monsters plays
This page is compiled from the provider’s published data and the HGC register. It is not a review: we have not tested Book of Monsters yet, so it has no score.
Book of Monsters is a Pragmatic Play slot, paying for clusters instead of lines. It was released in March 2025. It is themed around horror.
It is certified by the HGC for online play in Greece, certificate HGC-028710-TM; last updated in the register on 11 April 2025.
Book of Monsters combines free spins, cluster pays and bonus buy. 1 other slot of the 593 with data in our catalogue has exactly the same combination.
RTP 96.5%: what it means
The RTP (return to player) of Book of Monsters is 96.5%. Over a very large number of spins the game theoretically pays back €96.50 for every €100 staked; the remaining €3.50 (3.5%) is the house edge. It is not a forecast for one session: over a few spins everything is chance, and over time the edge stays with the casino.
That equals the median RTP (96.5%) of the 593 slots with data in our catalogue. Across the 507 Pragmatic Play slots we track, the median RTP is 96.5%. 96.5% is the default value published by Pragmatic Play; a casino may offer Book of Monsters in a version with a different RTP, so check the game’s info screen.
Volatility: high
The provider rates the volatility of Book of Monsters as “high”. Wins are rarer and concentrated in the bonus rounds. Long losing stretches are expected, so a balance can run out quickly.
Of the other 506 Pragmatic Play slots in our catalogue, 434 share this level with Book of Monsters.
Max win: 5,000×
The top prize on Book of Monsters is 5,000× the stake, i.e. €5,000 at a €1 stake. It is a ceiling reached extremely rarely — not a win anyone should expect. That is below the median (7,500×) of the 544 slots in our catalogue that publish a max win; 296 are higher.
Bet range
The provider does not publish a bet range for Book of Monsters in our data source; the minimum and maximum stake are shown in the game’s info screen at the casino.
Bonus features
Free spins
A round of spins you are not charged for, usually triggered by scatter symbols. Anything won in the round is added to your balance. In Book of Monsters it comes together with cluster pays and bonus buy. Found in 489 of the 593 slots with data in our catalogue and in 416 of Pragmatic Play’s 507.
Cluster pays
Groups of matching symbols that touch each other win, instead of symbols on paylines. In Book of Monsters it comes together with free spins and bonus buy. Found in 66 of the 593 slots with data in our catalogue and in 53 of Pragmatic Play’s 507.
Bonus buy
Lets you buy the bonus round directly, at a cost of many times your stake — often tens or hundreds of times. It raises the amount you play very quickly; whether it is offered depends on the casino. In Book of Monsters it comes together with free spins and cluster pays. Found in 450 of the 593 slots with data in our catalogue and in 394 of Pragmatic Play’s 507.
Frequently asked questions
What is the RTP of Book of Monsters?
The RTP of Book of Monsters is 96.5%, according to the provider (Pragmatic Play). That is a house edge of 3.5% over the long run; a single session can differ a lot.
Is Book of Monsters certified in Greece?
Yes. The HGC has certified Book of Monsters for online play, certificate HGC-028710-TM (last updated in the register on 11 April 2025). You can check it with the “Is this slot certified in Greece?” search on frut.gr or in the HGC’s public register.
What is the max win on Book of Monsters?
5,000× the stake, according to the provider. It is a theoretical ceiling that is reached very rarely.
How volatile is Book of Monsters?
“High”, according to the provider. Wins are rarer and concentrated in the bonus rounds.
What bonus features does Book of Monsters have?
According to the provider: free spins, cluster pays and bonus buy.
Can I play Book of Monsters for free?
Yes, in the demo on this page, with play money and only after confirming you are 21+.
Similar slots
Book of Monsters compared
The most closely related slots in our catalogue, by provider, volatility, theme and features:
| Slot | RTP | Volatility | Max win | Grid |
|---|---|---|---|---|
| Book of Monsters | 96.5% | high | 5,000× | — |
| Beware The Deep Megaways | 96.52% | high | 10,000× | — |
| Blade & Fangs | 96.05% | high | 5,000× | 5×3 |
| Bloody Dawn | 96.5% | high | 5,000× | 5×4 |
Compared with Beware The Deep Megaways (Pragmatic Play), Book of Monsters has an RTP 0.02 points lower, the same volatility and half the max win. Both have free spins and bonus buy. Only Beware The Deep Megaways has multipliers, cascades and Megaways. Only Book of Monsters has cluster pays.
Compared with Blade & Fangs (Pragmatic Play), Book of Monsters has an RTP 0.45 points higher, the same volatility and the same max win. Both have free spins and bonus buy. Only Book of Monsters has cluster pays.
Compared with Bloody Dawn (Pragmatic Play), Book of Monsters has the same RTP, the same volatility and the same max win. Both have free spins and bonus buy. Only Bloody Dawn has cascades. Only Book of Monsters has cluster pays.