Book of Monsters Online
Best online casinos to play Book of Monsters for real money
Book of Monsters attributes
| RTP | 96.5% | Reels | 7 |
| Volatility | Medium | Rows | 7 |
| Min bet | C$0.20 | Max bet | C$240 |
| Max win | 5000x | Paylines | |
| Wild Symbol | Yes | Scatter Symbol | Yes |
| Bonus Game | Yes | Progressive Jackpot | Yes |
| Free Spins | Yes | Autoplay | Yes |
Book of Monsters review
Today, I want to talk to you about one of my favorite new releases of 2025: the Book of Monsters slot machine from Pragmatic Play. This game, developed by a reliable developer, uses the usual cluster mechanics but also offers an interesting bonus round and excellent winning potential. Large mega symbols can fill the entire grid and form maximum clusters. I recommend you check out this slot machine, as it has enormous potential.
The game’s volatility is high, which might scare beginners. However, I don’t recommend giving up on this game immediately, even with small bets and a minimal bankroll. Wait for the bonus round to activate: all your fears will vanish instantly. But before you play, I recommend reading my review. You’ll discover all the slot machine’s features and be able to find the optimal betting strategy.
Theme and gameplay
The graphics and theme of Book of Monsters have become one of its main features. The space monsters aren’t frightening; they’re cheerful and adorable, present both on and off the game board. The slot is full of atmosphere, with high-quality animations and visual effects. I’d also like to point out that it’s one of the most stable slots I’ve tested recently. With top-notch optimization, the graphics don’t affect the game’s stability at all, even on less powerful devices.
The sound design is also cartoonish, with catchy background music creating a mystical and magical atmosphere. The sounds of the game board are well-chosen: you’ll hear not only the spinning reels, but also the sounds of special symbols, wins, bonuses, and more.
The mobile version didn’t disappoint either. Despite the large game grid, the developer optimized the mobile version, and even in portrait mode on a small smartphone screen, the game is comfortable to play. The mobile graphics quality is identical to that of the PC version.
Symbols and prices
The Book of Monsters slot machine uses a grouping system to create winning combinations. To win, you must collect a group of 5 to 49 symbols on the game board. All symbols in the group must be touching horizontally or vertically. The larger the group, the bigger the win. This system is popular with many players because it allows for big wins at any time, even with small bets.
Before the game starts and at the beginning of each round, you can adjust your bet amount between $0.20 and $240. The Ante Bet feature is also available, allowing you to increase the maximum bet to $480. This is great news for high rollers who can implement their boldest strategies. However, even beginners can play cautiously and with minimal risk, while still winning.
The highest paying symbols are represented by red, green, and purple monsters. They rarely form winning groups but offer significant multipliers, ranging from x0.5 to x5000. The lowest paying symbols are traditionally represented by playing cards from A to J. They make up the basis of regular wins but offer low multipliers, ranging from x0.2 to x150.
The yellow monster acts as the Scatter symbol and triggers the main bonus round. Furthermore, the bonus symbol offers wins ranging from x2 to x100. A unique feature of this symbol is that it doesn’t need to form a group; from 3 to 7 symbols can contribute to the win, anywhere on the board.
Features and bonuses
The bonuses in Book of Monsters are similar to those in Book of…, but are much better implemented. If you enjoy book-themed slots but want to experience something new, this is the perfect choice.
Free tours
To activate the bonus round, you must collect 4, 5, 6, or 7 Scatter symbols on the game board. You will receive 5, 6, 7, or 8 initial free spins, respectively.
Before the bonus round with free spins begins, a random symbol will be selected and a gamble feature will be triggered. You can choose to participate in the gamble feature or decline it and proceed to the bonus round. Within the gamble feature, you can increase the number of free spins, but you can also end the bonus round at any time without triggering it. You can also take a risk and replace the symbol with a higher-paying one. I advise against trying to increase the number of spins in this mini-game, and I’ll explain why below.
After triggering the bonus round, the selected symbol remains on the game board. This symbol is displayed on the right side of the board, and below it is a counter indicating the number of special symbols to collect. Filling this counter awards you 1 to 3 additional free spins. Furthermore, after filling the counter once, you can start again with a second one. This is why additional spins are inevitable; don’t risk triggering the bonus game before it begins.
The main feature of the bonus game lies in the size of the symbols. The special symbol increases in size each time it is filled. The initial size of this symbol is 1×1, then 2×2, 3×3, and up to 7×7. This guarantees you big wins by forming large groups. The chances of the symbol increasing in size are high, so you’re practically guaranteed to win.
Bonus purchase
The buy function lets you instantly activate the bonus round with free spins. By wagering 100 times, you activate the bonus game. From 4 to 7 Scatter symbols appear on the grid.
Ante Bet
This feature can be manually activated at any time during the game. You double your bet, thus significantly increasing your chances of triggering the bonus game.
RTP and Volatility
The Book of Monsters slot machine is characterized by high volatility. This means that the frequency of wins will be low, but the payouts will be large. However, during testing, I couldn’t confirm that the volatility was actually high. Admittedly, the frequency of wins isn’t very high, but even with a small bankroll, you can still profit from it.
The RTP is 96.5%, which is in line with the average value and makes long playing sessions profitable. The house edge gradually decreases to 3.5%.
Conclusion
The Book of Monsters slot machine revisits familiar mechanics. The special symbol expansion feature during the bonus round is retained, but it’s combined with clustered wins. The symbol doesn’t fill the reel, but grows and can occupy the entire grid. This feature makes the bonus round so promising in terms of winnings. That’s why the bonus buy function seems particularly relevant here.
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