Book of Monsters

Book of Monsters Book of Monsters
Game information
VolatilityExtreme
Max winx5000
RTP96.5%
Release date27.03.2025
Game typeSlot
ProviderPragmatic Play
RTP range96.5%, 95.5%, 94.5%
VolatilityExtreme
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 Purchase, Cluster Pays, Expanding Symbols, Free Spins, Free Spins Retrigger, Gamble Feature, Giant Symbols, Special Bet, Turbo Spins
VersionsPC, Mobile
Progressive jackpotNo
Last updated11.04.2025
Play demo
Book of Monsters
8.7
GamblerID
Score
User Rating 0/10
(0 votes)
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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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Where can I play this game
JoyCasino JoyCasino
200% up to $2 000 + 200 FS
Payout24-120 hours
Min deposit EUR
More info
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100% up to $100 + 100 FS
Payout2-120 hours
Min deposit EUR
More info
Casumo Casino Casumo Casino
100% up to $300 + 20 FS
Payout24-72 hours
Min deposit EUR
More info
LeoVegas Casino LeoVegas Casino
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Payout24-168 hours
Min deposit EUR
More info
Guts Casino Guts Casino
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Payout24-72 hours
Min deposit EUR
More info
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Payout24-120 hours
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More info
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Get 100 FS
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More info
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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.

Symbols and Paytable

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

Common questions answered

Can I play Book of Monsters slot Free Demo?

Yes, truly, no one is excluded from taking part Book of Monsters costless preview mode, no account needed. The costless sneak peek enables you to test drive the slot beforehand Circumventing authentic pecuniary stakes and helps you discover all of its features.

Can I win real money on Book of Monsters slot?

Please note that real money can only be won while playing in the casino with real or bonus funds. Utilizing a practice account or mode prevents earning actual funds or incurring any losses.

What is the RTP and Maximum Win of the Book of Monsters slot?  

The Book of Monsters slot comes with an RTP: 96.5%, 95.5%, 94.5%%. The higher the projected return ratio, higher potential for a triumphant spin on the reels. The greatest sum you can win is delimited to x5000 of the bet, and the Risk is specified as Extreme.

Can I play Book of Monsters slot on mobile phone? 

Yes, you can activate the Book of Monsters slot on your mobile device as it utilizes HTML5 technology, which allows for enabling trial play without the need for prior downloading.

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

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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.