Highlights
- Unique Fat symbol feature
- Cluster pays mechanic
- Free spins with scatter symbol upgrades
Contents
Book of Monsters Slot Overview
Book of Monsters, produced by Pragmatic Play, is a monster-themed video slot. Played on a 7x7 grid, the game uses a cluster pays system, forming winning symbols when five or more matching symbols connect. While the base game is relatively straightforward, the free spins round introduces the Fat symbol mechanic. Players collect symbols to upgrade the Fat symbol and unlock greater win potential, including the opportunity to win the Book of Monsters top prize of 2,500x your bet.
Although there are no wilds, the possibility of massive Fat symbols (up to 7x7) keeps things interesting.
Book of Monsters Slot Theme, Graphics & Soundtrack
The monsters in the Book of Monsters slots game are designed with exaggerated features, making them more endearing than frightening. The cave background is dark and atmospheric, with glowing eyes peeking from the shadows.
Animations & Sound
Sound effects are appropriately eerie but subtle, matching the light-hearted monster theme.

Book of Monsters RTP & Payout Potential
The RTP for the Book of Monsters is 96.5%. With its high volatility, the maximum win is 2,5000x your bet.
Essential Tips for New Players
If you’re just getting started with Book of Monsters, here are a few foundational strategies to enhance your play:
- Start with smaller stakes to get a feel for the game’s mechanics, especially during the base game which can be volatile.
- Keep an eye out for scatter symbols – four or more will trigger the all-important free spins round.
- Use the gamble feature cautiously before free spins. While it can award extra spins or better Fat symbols, a failed gamble ends the bonus round.
- Focus on symbol collection during free spins – the more symbols collected, the larger the Fat symbol becomes, increasing your chance of higher payouts.
- Take breaks during longer sessions. This game’s high volatility can lead to long dry spells, so managing your bankroll is essential.
How to Play Book of Monsters
Pragmatic Play supports responsible gaming with player protection tools like self-exclusion and timeout periods.
- Select your desired bet size. The minimum bet is 20p. Adjust your stake within your budget.
- Click the spin button to start. Form winning clusters of five or more adjacent matching symbols to win.
- Find the scatter symbol. Landing four or more scatters activates the free spins round.
How to Win at Book of Monsters
Book of Monsters uses a cluster pays system where forming clusters of matching symbols leads to payouts. Since there are no wilds, players rely on Fat symbols and scatter-triggered bonuses to maximize their winnings.
Ways to Win
- Cluster Pays: Form clusters of five or more matching symbols to win.
- Fat Symbols: Oversized symbols can expand up to 7x7 spaces for larger wins.
- Scatter Symbols: Landing four or more scatters triggers free spins.
- Free Spins Growth: Collect matching symbols to upgrade the Fat symbol and unlock additional free spins.
Understanding Game Mechanics
What makes this game unique?
Book of Monsters stands out due to its Fat symbol mechanic, which is relatively uncommon in slot games. The Fat symbol grows in size as you collect matching symbols during free spins, turning the grid into a potential win powerhouse.
Combined with the cluster pays layout, this design diverges from traditional paylines, allowing for more dynamic and visually exciting wins. The absence of wilds also pushes players to focus on strategy and symbol combinations rather than relying on traditional symbol substitution.
Additionally, the theme of comedic monsters, eerie cave setting, and stylised graphics offer a refreshing take on monster slots, combining humour and suspense in equal measure.
Free Spins and Fat Symbols
The free spins round begins when four or more scatter symbols appear. Before it starts, a random Fat symbol is selected. Players can gamble to win additional spins or upgrade to a more valuable Fat symbol, though an unsuccessful gamble ends the feature.
During free spins, the Fat symbol moves to a new position on each spin. Collecting matching symbols increases its size, starting from 2x2 and growing up to 7x7. Additional free spins are awarded as the Fat symbol grows.
Best Pragmatic Play Slots
View allBook of Monsters Overview Summary
Book of Monsters offers an entertaining experience with a monster-themed aesthetic, unique mechanics, and a 2,500x max win. The base game is relatively simple, but the Fat symbol in the bonus round adds an extra layer of excitement.
Win Potential
The game's high volatility and maximum win of 2,500x your bet mean significant rewards are possible. However, those seeking frequent smaller wins may find the base game less appealing.
There is no win multiplier, and the absence of wild symbols may feel limiting to some players. Additional bonus features in the base game could enhance the experience further.
Disclaimer: Book of Monsters trademark / license is owned by Pragmatic Play. This site is not endorsed by Pragmatic Play.
| Slot Name: | Book of Monsters |
|---|---|
| Software: | Pragmatic Play |
| RTP: | 96.5% |
| Volatility: | High volatility |
| Paylines: | 0 |
| Reels: | 7 |
| Min Bet (all lines covered): | £0.20 (GBP) |
| Max Bet: | £5 (GBP) |
| Top Win: | 2500 |
| Features: | Scatter Symbol, Free Spins, Clusters, High volatility, 7 Reels, Symbol Collection, Multi Level Bonus, Colossal Symbols |
| Themes: | Magic |
| Last Update: | 27/05/2025 |
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Yes. Pragmatic Play have a UKGC license and are allowed to offer their games at UK licensed casinos. |
FAQs
How does the cluster pays system work in Book of Monsters Slot?
The game uses a cluster pays system where wins are formed when five or more matching symbols are adjacent, either vertically or horizontally. Bigger clusters result in bigger payouts.
What is the maximum win in Book of Monsters Slot?
The maximum possible win in Book of Monsters is 2,500x your bet.
Does Book of Monsters Slot have wild symbols?
No, Book of Monsters slot does not feature traditional wild symbols. Instead, the game uses the Fat symbol, which can help increase winning potential. During the free spins round, the Fat symbol can grow in size, offering opportunities for larger payouts, especially when it covers more positions on the grid.
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