Book of Monsters

Book of Monsters Book of Monsters
Game information
VolatilityExtreme
Max winx5000
RTP96.5%
Release date27.03.2025
Game typeSlot
Provider Pragmatic Play
RTP range96.5%, 95.5%, 94.5%
Volatility Extreme
Hit frequency 23.2%
Bonus frequency 0.34%
Min bet0.2 EUR
Max bet240 EUR
Max win multiplierx5000
Max win value1 200 000 EUR
Layout 7*7
Lines0
FeaturesAutoplay, Bonus Buy, Cluster Pays, Expanding Symbols, Free Spins, Free Spins Retrigger, Gamble Feature, Giant Symbols, Special Bet, Turbo Spins
VersionsPC, Mobile
Progressive jackpot No
Last updated11.04.2025
Play demo
Book of Monsters
8.7
GamblerID
Score
User Rating 0/10
(0 votes)
Write a comment

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Pros
‘Buy Free Spins’ option
Extra FS
'Ante bet' option
Max win is x5,000
Cute monsters & pleasant musical accompaniment
Convenient betting range (€0.2—€240)
Beneficial Cluster Pays payment mechanics
Random giant Fat symbols supplying big wins
Bonus FS game with a sticky Fat symbol
Fat symbol gradually grows up to 7x7 during Free Spins
Cons
RTP varies from 96.5% to 94.5%
Non-frequent FS triggering
Lack of the Wild symbol
Comments

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Book of Monsters Slot Review

Book of Monsters is a New Slot recently released by Pragmatic Play. It boasts a creative duo of features that are undoubtedly a powerful tandem in terms of potential profit. These functions are the Cluster Pays mechanics and Fat symbols. Furthermore, free spins, which are always in high demand, are in place. By the way, it is a Mobile Slot, too. Hence, you can indulge in it whenever you want, regardless of whether a PC is nearby.

Book of Monsters by Pragmatic Play Slot Features

Book of Monsters Play Free Demo

By the way, there is a nice chance to try this stunning game out, thanks to the training mode that the Book of Monsters is equipped with. It implies playing with fake currency, which never ends. It's only required that the game page be refreshed to refill the balance once it is exhausted. So, this way of entertainment opens unlimited opportunities for those targeted to learn the slot, reveal its prize potential, or invent the best-working winning strategy. You can play the Free Slot on this page. Furthermore, we recommend a robust Real Money Casino to those ready to play this game with cash.

Free Demo - Book of Monsters Slot

Book of Monsters Bonus Features

This High-Volatility Slot boasts a big 7x7-sized playfield. Furthermore, it’s a Cluster Pays Slot. Let’s learn how exactly Cluster Pays mechanics work.

Cluster pays

This payment mechanic works like this: at least 5-of-a-kind paying symbols bring a payout if they form a cluster by connecting each other horizontally or vertically.

Fat Symbols

These are in play within the base and bonus game and can be of the following sizes—2x2, 3x3, 4x4, 5x5, 6x6, and 7x7. During the primary mode, the minimum Fat symbol’s size is 3x3. In the base mode, the Fat symbol appears in random rounds, whereas within Free Spins, a single Fat symbol is always on the screen.

Fat Symbols - Book of Monsters Slot

Bonus Symbol

These trigger the bonus game, featuring Free Spins:

Number of Bonus symbols

Number of starting FS

4

5

5

6

6

7

7

8

Bonus symbols also pay, yielding up to x100 for a 7-symbol winning cluster.

Bonus Symbol - Book of Monsters Slot

Free Spins (FS)

Once a bonus FS game has started, a random paying symbol is chosen to be the Fat one during FS.

Gamble round

Yet, the most risky players can try to get a higher-valued paying symbol as a Fat one instead of that chosen automatically. The chances of success are always showcased in percentage. The higher the number of free spins or the higher the value of the paying symbol you want to nab, the lower the odds of winning. The maximum number of initial Free Spins one can get this way is limited to 8 FS. Of course, you can also lose a chance to play Free Spins in this case, as any try can lead to failure.

Gamble round - Book of Monsters Slot

Gameplay

The chosen Fat symbol is always on the screen, roaming onto random positions with each new round. Initially, its size is 1x1. Yet, the Fat symbol can gradually grow due to a special meter collecting images that are identical to the Fat symbol:

Symbols’ number to collect

The size of the Fat symbol

30

2x2

27

3x3

24

4x4

20

5x5

16

6x6

12

7x7

As you can see, the bigger the Fat symbol, the simpler it is to grow further. Moreover, each time the Fat symbol gets more extensive, a random number of FS is awarded (1, 2, or 3).

Buy Free Spins

Luckily for you, it is a ‘Bonus Buy’ slot, which allows you to prompt Free Spins at any moment for the price of x100 by the current bet. However, the number of Bonus symbols triggering a bonus FS game will be random (4, 5, 6, or 7).

Ante Bet

Additionally, one can pile on their chances to activate FS by enabling the ‘Ante Bet’ option. This feature doubles your stake, yet wins are paid as if the bet is still the same. Yet, this function 7 times increases the odds of getting a bonus FS game triggering.

Our Experience Playing Book of Monsters

We’ve experienced a 300-spin playing session to understand how engaging and fruitful this slot is regarding great wins. Our starting deposit totaled €200, whereas the stake per round was €1. Finally, it was the Best RTP Slot (96.5).

Sadly, the first hundred spins didn’t reward us with bonus FS game triggering. Yet, we got 21 regular wins, from €0.2 to €25.2. By the way, only nine cash prizes were lower than €1 (our current stake). As a result, after the 100th spin was out, we possessed the €162.8 amount.

The following hundred spins also didn’t please us with a Free Spins activation. Instead, we reaped 23 base game rewards, ranging from €0.2 to €40. A few big wins amounted to x20, x20, and x15 to the bet. This time, only seven cash prizes appeared lower than €1. And when these hundred spins went out, our game balance was €197.15.

Fortunately, the 3rd hundred spins finally presented us with Free Spins that earned the giant sum of €406.8. That became possible due to a pair of fortunate circumstances. First, we got the highest-paying symbol chosen as the Fat symbol. Second, the Fat symbol eventually grew up to the 5x5 size. The regular prizes totaled 28, including 12 less than the stake. Also, we got three relatively large win strikes—all were x15 by the bet. We eventually possessed as much as €589.6 when the game was over. Therefore, we won precisely €389.6. Nice!

Book of Monsters Verdict

To sum up, many wins were over the current stake, which is beneficial since it allows for a refill of the game balance, even when the bonus FS game triggers infrequently. Free spins were not frequently activated, yet even a single bonus game activation has contributed much money. Frankly, it is a classic high-volatility slot-playing scenario when you must patiently await a mouthwatering prize. Of course, besides patience, you also require a bulk wad of banknotes to play this game long enough to wait for a decent reward. So, for casual punters, this playing title may seem far too volatile.

Concluding this Slot Review, it is left to summarize that the primary mode contributes its portion of thrill, thanks to numerous big wins (we got eight x10–x40 wins per 300 spins). The bonus FS game supplies a Fat symbol that quickly grows and delivers extra Free Spins, providing solid cash prizes growing parallel to the Fat symbol's size. The Fat symbol reached the 5x5 size in our case. Overall, it is a fun and thrilling game that can bring you stunning prizes during the bonus game and base one. The only challenge here is to await the bonus FS game triggering to get a real chance to snag a small fortune.

Daniel Borg
Daniel Borg
Content Writer & Slot Reviewer

Symbols and Paytable

Symbol Red Monster
Red Monster
49+x5000
40+x500
31+x200
28+x100
21+x60
17+x40
13+x25
9+x15
8x10
7x6
6x4
5x2
Symbol Green Monster
Green Monster
49+x500
40+x250
31+x100
28+x50
21+x30
17+x20
13+x12.5
9+x7.5
8x5
7x3
6x2
5x1
Symbol Purple Monster
Purple Monster
49+x250
40+x125
31+x50
28+x25
21+x15
17+x10
13+x6.25
9+x3.75
8x2.5
7x1.5
6x1
5x0.5
Symbol Ace
Ace
49+x200
40+x100
31+x40
28+x20
21+x12
17+x8
13+x5
9+x3
8x2
7x1.25
6x0.75
5x0.4
Symbol King
King
49+x150
40+x75
31+x30
28+x15
21+x9
17+x6
13+x3.75
9+x2.5
8x1.5
7x1
6x0.6
5x0.3
Symbol Queen
Queen
49+x125
40+x62.5
31+x25
28+x12.5
21+x7.5
17+x5
13+x3
9+x2
8x1.25
7x0.75
6x0.5
5x0.25
Symbol Jack
Jack
49+x100
40+x50
31+x20
28+x10
21+x6
17+x4
13+x2.5
9+x1.5
8x1
7x0.6
6x0.4
5x0.2
Symbol Bonus
Bonus
7x100
6x50
5x15
4x5
3x2

Common questions answered

Can I play Book of Monsters slot for free in demo mode?

Sure, it's possible to launch the Book of Monsters slot for free, no registration needed. This free mode allows you to explore the slot's mechanics without risking real money. It's perfect for newcomers, as it walks you through bonuses and extras.

Can I win real money on Book of Monsters slot?

You can only win actual money if you’re playing with real cash or promotional credits at a casino. Demo mode is for practice only, so it's 100% safe and for entertainment only.

What is the RTP and maximum win of the Book of Monsters slot?

The RTP of Book of Monsters is 96.5%, 95.5%, 94.5%. Greater return to player, the more favorable it is for players. The maximum win is can reach up to x5000 of your bet. The slot's volatility is marked as Extreme, which affects how often and how big you win.

Can I play Book of Monsters slot on mobile?

Yes, the Book of Monsters slot is fully compatible with phones and tablets. Thanks to HTML5 technology, you get seamless access on the go, whether you're on a smartphone or a tablet.

What is the best place to play Book of Monsters slot?

Most reliable place to play Book of Monsters with cash stakes is at an online casino that is: +Licensed, +Safe and secure, +Offers fair terms, +Pays out quickly, +Gives good rewards, and +Provides 24/7 support. You can check our reviews and pick the best one for you.

How many pay lines are in Book of Monsters?

There are no pay lines here, as the Cluster Pays mechanics are employed instead.

What features are involved in the core mode?

Within the core mode, the gigantic Fat symbol that appears in random rounds is the only bonus function.

What bonus mini-games are present in this slot?

This slot offers Free Spins. These also employ the Fat symbol, which gradually grows to a maximum size of 7x7.

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