Who Should Play Book of Monsters?
You’ll love Book of Monsters if you’re a fan of high-volatility slots with unique mechanics and monstrous potential. This 7×7 cluster-pays game is perfect for thrill-seekers who enjoy the excitement of expanding symbols and progressive features. You’ll be captivated by the quirky monster theme and the chance to win up to 5,000x your bet. Whether you’re a seasoned player or new to slots, Book of Monsters offers an otherworldly gaming experience that’s sure to keep you entertained.

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Book of Monsters (Pragmatic Play) – Slot Information
Characteristic | Value |
---|---|
🎮 Game Type | Cluster Pays Slot |
🎲 Provider | Pragmatic Play |
📅 Release Date | March 2025 |
💰 RTP | 96.50% (Alternative versions: 95.50%, 94.50%) |
🔥 Volatility | High |
💎 Maximum Win | 5,000x bet |
🎯 Win Probability | 1 in 547,945 spins |
🎰 Grid Layout | 7×7 |
🧩 Paylines | Cluster Pays (5+ adjacent symbols) |
💵 Minimum Bet | $0.20 |
💸 Maximum Bet | $240 ($480 with Ante Bet) |
🎭 Theme | Monsters/Fantasy |
🎨 Graphics | 3D Animation |
🎧 Sound | Immersive Fantasy Soundtrack |
📱 Platforms | Mobile, Desktop, Tablet |
💻 Technology | HTML5, JS |
🎁 Bonus Features | Fat Symbols, Free Spins, Ante Bet, Feature Buy |
🎯 Hit Frequency | 23.2% |
🎪 Bonus Game Frequency | 1 in 291 spins |
🎲 Free Spins | 5-8 (triggered by 4-7 scatter symbols) |
💲 Bonus Buy Cost | 100x bet |
🔄 Ante Bet | 2x stake (7x more likely to trigger Free Spins) |
🃏 Symbols | J, Q, K, A, Purple Monster, Green Monster, Red Monster |
👁️ Scatter Symbol | Orange Eyeball |
You’ll enjoy a smooth gaming experience across all your devices with this HTML5-powered slot. The game’s high volatility means you might wait longer between wins, but when they hit, they can be substantial – especially when those quirky monsters grow to their full size!
Pros and Cons of Book of Monsters
Pros:
- You’ll experience thrilling gameplay with the innovative Fat Symbols feature that allows symbols to grow up to a massive 7×7 size, creating enormous win potential of up to 5,000x your bet.
- You’ll benefit from an above-average RTP of 96.50%, giving you better long-term winning chances compared to many other slots on the market.
- You’ll enjoy strategic depth with multiple ways to enhance your experience, including the Ante Bet option that makes triggering Free Spins 7 times more likely, and the Feature Buy for instant bonus action.
- You’ll be captivated by the cluster-pays system that eliminates traditional paylines, offering more dynamic winning possibilities through adjacent matching symbols.
Cons:
- The high volatility means wins can be less frequent, making it potentially risky if you’re playing with a smaller bankroll.
- You might find the complex features and progressive collection system during Free Spins overwhelming if you prefer simpler gameplay.
- Some casinos may offer lower RTP settings of 95.5% or 94.5%, which could reduce your potential returns over time.
- The base game can feel somewhat feature-light compared to the bonus round, with Fat Symbols appearing randomly and not as frequently as you might hope.
How to play Book of Monsters?
You can start playing Book of Monsters in just a few simple steps:
Step 1
Locate the Play for Free button on our page to launch the demo version without registration or downloads.
Step 2
Once the game loads, select your bet amount using the + and – buttons (ranging from $0.20 to $240).
Step 3
Consider activating the Ante Bet feature by clicking its button to make Free Spins 7x more likely to trigger (doubles your stake).
Step 4
Hit the Spin button to start playing on the 7×7 grid, where you’ll need 5+ matching adjacent symbols to form winning clusters.
Step 5
For real money play, click the Play in Casino button on our page, select one of our trusted casinos, create an account, and make a deposit.
Paytable
You’ll discover generous rewards in Book of Monsters’ cluster-pays system, where forming groups of 5+ matching symbols adjacent to each other horizontally or vertically creates wins. The quirky monsters offer the highest payouts, with the red monster potentially awarding a massive 5,000x your bet for a full grid cluster!
Symbol | 5 Symbols | 6 Symbols | 7 Symbols | 8 Symbols | 9-12 Symbols | Full Grid (49 Symbols) |
---|---|---|---|---|---|---|
![]() | 2x | 8x | 15x | 25x | 40x | 5,000x |
![]() | 1x | 10x | 15x | 25x | 40x | 500x |
![]() | 0.5x | 8x | 12x | 20x | 30x | 250x |
![]() | 0.4x | 12x | 20x | 30x | 50x | 200x |
![]() | 0.3x | 10x | 15x | 25x | 40x | 150x |
![]() | 0.25x | 8x | 12x | 20x | 30x | 125x |
![]() | 0.2x | 6x | 10x | 15x | 25x | 100x |
![]() | 2x (2 symbols) | 5x (3 symbols) | 15x (4 symbols) | 50x (5 symbols) | 100x (6-7 symbols) | N/A |
Book of Monsters Slot Overview
You’re in for a thrilling adventure with Book of Monsters, Pragmatic Play’s innovative 7×7 cluster-pays slot. This high-volatility game offers an exciting blend of expanding symbols, free spins, and the potential for massive wins up to 5,000x your bet. With its quirky monster theme and unique gameplay mechanics, you’ll find yourself immersed in a world of monstrous payouts and captivating features.

Symbols and Payouts
In Book of Monsters, you’ll encounter a cast of charming yet lucrative monster symbols. The red monster reigns supreme, offering the highest payout of 5,000x your bet for a full grid. Following closely are the green and purple monsters, with payouts of 500x and 250x respectively for a full grid. The royal card symbols (A, K, Q, J) round out the paytable, offering smaller but more frequent wins.
You’ll love the unique cluster-pays system, where forming groups of 5 or more adjacent matching symbols creates wins. The larger your cluster, the bigger your payout! Keep an eye out for the orange eyeball scatter symbol, which not only awards instant wins but also triggers the exciting Free Spins feature when you land 4 or more.
Play Book of Monsters on Mobile
You’ll enjoy seamless gameplay on your mobile device with Book of Monsters. Pragmatic Play has optimized this slot for smartphones and tablets, ensuring you can chase those monstrous wins wherever you go. The 7×7 grid adapts perfectly to smaller screens, and the intuitive touch controls make spinning the reels a breeze. Whether you’re using iOS or Android, you’ll experience the same high-quality graphics and smooth animations as the desktop version.
Gameplay and Overall Experience
You’re in for an immersive experience with Book of Monsters. The game’s standout feature is the Fat Symbols mechanic, where symbols can grow up to a massive 7×7 size, potentially covering the entire grid for enormous payouts. During the base game, you’ll see these Fat Symbols appear randomly, adding an element of surprise and excitement to every spin.
The Free Spins round is where the action really heats up. You’ll start with 5 to 8 free spins, depending on the number of scatters that triggered the feature. During this bonus, you’ll collect special symbols to upgrade your monsters, making them grow larger and more valuable with each appearance. This progressive element keeps the excitement building throughout the bonus round, with the potential for truly monstrous wins by the end.
For those who love to customize their gameplay, you’ll appreciate the Ante Bet feature. By increasing your stake by 2x, you’ll make the Free Spins 7 times more likely to trigger. If you’re feeling particularly impatient, you can use the Feature Buy option to jump straight into the Free Spins round for 100x your base bet.

Book of Monsters RTP, Payout, and Volatility
You’ll find Book of Monsters offers a competitive return-to-player (RTP) rate of 96.50%, which is above average for online slots. However, be aware that some online casinos may offer lower RTP settings of 95.50% or 94.50%, so it’s always worth checking before you play.
The game’s high volatility means you might experience longer dry spells between wins, but when those wins do come, they have the potential to be substantial. With a maximum payout of 5,000x your bet, there’s always the chance for a life-changing win just around the corner.
The hit frequency of 23.2% means you’ll see winning combinations form on roughly one in every four spins, keeping the action flowing. The bonus game triggers on average once every 291 spins, but remember, you can increase this frequency with the Ante Bet feature or guarantee it with the Feature Buy option.
With its blend of innovative features, high volatility, and massive win potential, Book of Monsters offers an exhilarating gaming experience that will keep you coming back for more. Whether you’re a high roller chasing those 5,000x wins or a casual player enjoying the quirky monster theme, this slot has something to offer everyone.
Best Similar Book of Monsters Slots
If you enjoy Book of Monsters, you’ll love these other exciting Pragmatic Play titles that offer similar thrilling gameplay experiences:
Fire Portals
⭐ Cluster Pays System – Features the same 7×7 grid with cluster wins requiring 5+ connected symbols
⭐ Sticky Wilds – Enjoy roaming wilds with multipliers that increase with each win contribution
⭐ Massive Win Potential – Chase wins up to 10,000x your bet with multipliers that can reach 2,500x
Book of Golden Sands
⭐ Expanding Symbols – Collects special symbols during free spins for increased winning potential
⭐ Wild Multipliers – Features 2x and 3x wild multipliers that boost your winning combinations
⭐ High Volatility – Offers the same thrilling high-risk, high-reward gameplay you love
Gates of Olympus
⭐ Tumble Mechanic – Winning symbols disappear, allowing new ones to cascade for multiple wins per spin
⭐ Random Multipliers – Multipliers can appear randomly during spins to significantly increase prizes
⭐ 96.5% RTP – Matches Book of Monsters’ generous return-to-player percentage



Our Own Gameplay Experience
We tested Book of Monsters extensively since its March 2025 release, and you’ll be thrilled to know we hit a remarkable 1,250x win during our sessions! After activating the Ante Bet feature, we triggered Free Spins within just 41 spins. The Red Monster was selected as our Fat Symbol, growing to a massive 5×5 size by the end of the bonus round. While the base game delivered consistent small wins through the cluster-pays system, it was the Free Spins where the real magic happened. The expanding Fat Symbols mechanic truly shines when you collect enough symbols to reach those larger sizes.

Frequently Asked Questions (FAQs)
Yes, you can play Book of Monsters for free through the demo version available on our site and many online casinos. This risk-free option allows you to explore the game’s mechanics, features, and betting strategies before committing real money. You’ll get the full experience of the 7×7 grid and all special features without any financial commitment.
Your best strategy is to utilize the Ante Bet feature, which makes Free Spins 7 times more likely to trigger, though it doubles your stake. Consider using the Feature Buy option (100x your bet) to skip directly to the Free Spins where the progressive Fat Symbol mechanic offers the highest win potential. Focus on building your bankroll to withstand the high volatility while waiting for those potentially massive cluster wins.
You can win up to 5,000x your bet in Book of Monsters, which means a maximum of $1,200,000 when playing at the highest stake of $240. The probability of hitting the maximum win is approximately 1 in 547,945 spins. Your biggest wins will likely come during the Free Spins feature when the Fat Symbol grows to its maximum 7×7 size, potentially covering the entire grid.