Book of Monsters Slot Review
My idiot older brother used to invent monsters just to screw with me. And not your standard Boogeyman or even Godzilla types – oh no. His warped little brain cooked up horrors like The Sock Sucker and Mouthman 🤮.
Mouthman, he claimed, had mouths for hands and would eat your fingers if you picked your nose. The Sock Sucker? That thing would slither out from under the bed and suck your toes 🦶🏼if you didn’t change your socks.
Looking back, maybe my brother was just pushing personal hygiene via psychological warfare. What a saint 😇, that idiot.
Anyway, Book of Monsters slot from Pragmatic Play is here, and it’s packed with squishy blob 🍙 monsters – and those, I can deal with!
Gameplay
The game is played on a 7x7 grid, deep inside a creepy cave bubbling with cauldrons, and haunted by fanged ghost-blobs that look like half-melted candles. Poor things never stood a chance.
The symbols are equally fascinating, monster blobs, of different colors; red being the highest payer, followed by green and then purple. The lower-paying crew are card deck royals, and the Scatter symbol is a wondrous cyclopes blob.
Land enough of the one-eyed guy, and you’ll trigger up to 8 Free Spins, where a progression feature kicks in, and some monster-sized symbols take over.
The maximum payout in this game is $350,000, with the maximum multiplier climbing up to 5,000x.
Wins are based on Cluster PaysUnlike traditional paylines, Cluster Pays can award wins when a minimum number of matching symbols land adjacent to each other (vertically or horizontally), forming a cluster. – so forget fixed paylines, it’s all about clumps of the same kind of goo. The volatility is very high, the RTPRTP stands for “Return to Player.” The RTP describes the total bet amount that a game returns to players over millions of spins, and that figure is represented by a percentage. Table games, such as Roulette, typically have higher RTPs than many slots.
RTP needs to be considered in conjunction with a game’s volatility rate. is 96.5%, and the monsters are ready to rumble!
Features
FREE SPINS
The Free Spins feature can be triggered in several ways: by landing 4 or more Scatter symbols, by activating the Ante BetAn Ante Bet is an option that costs a percentage of your bet but increases your chances of landing triggering symbols that initiate a feature. (which increases your chances by 7x at 2x the cost), or by using the Buy Bonus option, which costs 100x your bet.
The number of Free Spins you receive depends on how many Scatters triggered the feature – 4 award 5 Free Spins, 5 award 6, 6 award 7, and 7 award the maximum of 8 Free Spins.
But that’s just the starting point.
Before the round begins, you’ll enter a Gamble Game that lets you upgrade your spin count and chosen Fat symbol (which can turn into a grid-dominating monster!).
That’s still not all, there’s an excellent progressive feature in Free Spins to unpack… So, let’s break those down.
FREE SPINS: GAMBLE GAME
Before starting the Free Spins round, you’ll have the chance to gamble two things separately: your chosen Fat Symbol and your Free Spins count. You can choose to gamble either one, or both.
If your Fat Symbol is already the highest-paying symbol (aka the Red Monster), or if you’ve already been awarded the maximum of 8 Free Spins, the corresponding gamble button will be disabled.
Each gamble plays out through a page-turning book animation. If the next page reveals a higher-paying symbol or a higher spin count, you win that gamble. (Heads up: the page only turns once).
You can then choose to Collect and proceed with the upgraded setup. But if the page reveals “The End,” you lose the gamble and the feature, and are sent back to the base game.
You can continue gambling as long as you haven’t lost and haven’t yet hit the cap of 8 Free Spins or the highest-value Fat Symbol (whichever comes first).
The game displays the odds of success for each gamble, right below the respective buttons – so you know what kind of risk you’re signing up for.
Once you either reach the max upgrades or decide to Collect your Fat Symbol and Free Spins count at any point, the feature begins.
FREE SPINS: PROGRESSIVE FEATURE
So, we know that before Free Spins are awarded, a mystery Fat symbol is chosen (and/or upgraded in the gamble game), and here’s where it packs a punch:
During Free Spins, your chosen Fat symbol comes with a progressive feature – growing in size up to a 7x7 giant symbol as the round unfolds.
It begins as a 1x1 symbol, appearing somewhere on the reels and moving to a new random position with every spin.
Throughout the round, each time symbols matching the one chosen as your Fat Symbol lands on the reels, and doesn’t overlap with the roaming Fat Symbol, it’s collected into a progression meter.
As this meter fills, the Fat Symbol evolves into larger versions of itself, covering more space on the grid and increasing the odds of creating winning combinations.
The meter itself, styled more like a bubbling cauldron than a standard tracker, sits on the bottom right of the reels. It also shows how many more symbols you need for the next size upgrade.
For extra clarity, your current Fat Symbol is displayed right above the meter – just in case you forget what you’re hunting.
Here’s the symbol collection breakdown:
• 30 symbols upgrades to 2x2
• 27 more symbols upgrades to 3x3
• 24 more symbols upgrades to 4x4
• 20 more symbols upgrades to 5x5
• 16 more symbols upgrades to 6x6
• 12 more symbols upgrades to 7x7
Each time the Fat Symbol grows, you’ll also be randomly awarded 1, 2, or 3 extra Free Spins. A pop-up appears and rotates until a number is selected.
Performance
As far as performance goes, this game loads fast, spins fast, and just, you know… doesn’t disappoint – just what I expect of it.
I tested it on both my mobile and MacBook and it excelled in both departments.
Maximum Win
You can win up to $350,000 and 5,000x your bet playing this game, with bet levels ranging from just $0.20, up to $70.
Conclusion
Book of Monsters slot may look like a goofy blob-fest, but don’t be fooled – it’s got serious win potential hiding under all that bizarre squish.
With a very high volatility setup, you’re not getting constant small wins; you’re playing for those big, beefy satisfying chunks that drop when the stars (and monsters) align just right.
And if that’s your thing, I can also recommend cracking open Book of Cupigs slot from GameArt. It’s got flying pigs, surreal charm, equally high volatility, and a slightly lower (but still tasty) $311,750 max win. Both games are proof that weird pays – and pays well.
Slot Details
Game Provider: Pragmatic Play
Game Type: Video Slots
PaylinesPaylines are preset lines that run across the reels, and when you land matching symbols on them, that will result in a payout. The more paylines, the more ways you can win, but also the higher your bet per spin.: Cluster PaysUnlike traditional paylines, Cluster Pays can award wins when a minimum number of matching symbols land adjacent to each other (vertically or horizontally), forming a cluster.
Volatility RateSlot games can have low, medium, high, or extremely high volatility rates (or a combination thereof).
The less volatile the game, the more often it should pay out, but the lower the amount, the less the payout, as this is in keeping with the risk you’re taking. Volatility rate should be considered in conjunction with a game’s RTP.: Very High
RTPRTP stands for “Return to Player.” The RTP describes the total bet amount that a game returns to players over millions of spins, and that figure is represented by a percentage. Table games, such as Roulette, typically have higher RTPs than many slots.
RTP needs to be considered in conjunction with a game’s volatility rate.: 96.5%
Bonus Round: No
Progressive: No
Free Rounds: Free Spins
Max Multiplier: 5,000x
Max Win: $350,000
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