Book of Monsters (Pragmatic Play) – Review & Demo Play

The Book of Monsters Slot Game

I went into Book of Monsters expecting a spooky read, but Pragmatic Play serves a light, playful grid slot. It runs on a 7x7 board with cluster pays, so wins land when at least five matching symbols touch horizontally or vertically. The cave backdrop pulses blue, then shifts to orange in free spins, while a floating book cues the action on the right. There are no cascades and no wilds, so the rhythm stays clean and spin focused, with clusters doing the heavy lifting.

Base play is stripped back, which I liked for its clarity, and the game throws in random Fat symbols sized 3x3 up to 7x7 to shake things up. Those oversized tiles can swing a round when they drop in the right place across the grid. The book’s Bonus symbol is your route to free spins, and you can grind, switch on the Ante Bet for a higher trigger chance, or pay the 100x fee to buy in. I tried all three routes while testing.

Symbols and Payouts in Book of Monsters

Seven regulars appear, split into low and high. The low side uses card ranks etched in stone: Jack of Diamonds, Queen of Clubs, King of Hearts, and Ace of Spades. On this cluster setup you need five or more connected to get paid, with those four worth 0.2 to 100x, 0.25 to 125x, 0.3 to 150x, and 0.4 to 200x the stake for five or more of a kind up to 49 in a block on the grid.

Premiums are the Purple, Green, and Red Monsters. They scale from 0.5 to 250x, 1 to 500x, and 2 to 5,000x the bet for clusters of five or more up to 49 in a group, with the cap matching the game’s 5,000x top prize. The only special is the Bonus symbol, an orange eye that can pay 2 to 100x for three to seven and also triggers free spins when enough land together. There are no wilds filling gaps in this setup.

Random Fat symbols can drop at any time in base play at sizes 3x3, 4x4, 5x5, 6x6, or 7x7. When a large tile lines up with matching neighbours, the payout climbs fast, and that is where the grid format shines brightest. I found the chunky pieces most helpful when they landed alongside a spread of the same rank rather than sitting isolated. In the bonus, a chosen paying symbol takes the Fat role and becomes the centre of a collection mechanic.

Book of Monsters Symbols and Paytable

Symbol	Quantity	Payout
	49+	x5000
	40+	x500
	7	x6
	6	x4
	5	x2
	49+	x500
	40+	x250
	7	x3
	6	x2
	5	x1
	49+	x250
	40+	x125
	7	x1.5
	6	x1
	5	x0.5
	49+	x200
	40+	x100
	7	x1.25
	6	x0.75
	5	x0.4
	49+	x150
	40+	x75
	7	x1
	6	x0.6
	5	x0.3
	49+	x125
	40+	x62.5
	7	x0.75
	6	x0.5
	5	x0.25
	49+	x100
	40+	x50
	7	x0.6
	6	x0.4
	5	x0.2
	Scatter

Book of Monsters Slot Bonus Features

Hit four to seven Bonus symbols to start five to eight free spins, or if Ante Bet is on, three to seven will award four to eight spins. Before the round, the book picks a paying symbol to act as the Fat symbol. You can gamble to step up the Fat symbol to a higher one, or gamble for more spins. If The End appears, the feature is lost. Successful gambles can take you to the highest symbol and up to eight free spins extra.

During free spins a roaming 1x1 Fat symbol moves to a new spot each spin. Any instances of the selected symbol that land and are not overlapped get collected to a meter. The Fat symbol grows at thresholds of 30, then +27, +24, +20, +16, and +12 collected, reaching 2x2 to 7x7, and each upgrade awards one to three extra spins. You can also buy the bonus for 100x, while Ante Bet doubles the stake, makes triggers seven times likelier, and disables buying.

Bonus Buy Feature

Free Spins Round FREE SPINS round can be purchased for 100x of the total bet. When buying a round, 4, 5, 6 or 7 BONUS symbols can appear randomly.
Feature Cost:	x100 Bet
RTP:	96.50%
Volatility:	-

How to Win at Book of Monsters Slot

In practice I chase connected blocks rather than single big tiles. Aim for boards where the chosen Fat symbol has plenty of presence, since every match feeds growth during the feature. Wins come from five or more adjacents anywhere on the 7x7, and stacked premiums are where the serious pays sit. Stakes range from 0.20 to 240 per spin, so I tweak bets, use Autoplay sparingly, and switch between normal and Quickspin depending on session goals and bankroll flow.

Book of Monsters Slot RTP & Volatility

Book of Monsters runs on high volatility with RTP up to 96.50% depending on configuration. The max win sits at 5,000x, tied to a 7x7 blackout of the top symbol, with a quoted top prize rate near one in 547,945 spins. The bonus appears around one in 291 spins on average. Base stakes span 0.20 to 240, and the Ante Bet increases trigger chance seven-fold by doubling the stake, while the Bonus Buy costs 100x from the main game.

The Final Verdict on Book of Monsters

I expected a classic Book setup with expanding specials on five reels, yet this one flips the script with a 7x7 cluster engine. The lack of cascades keeps the pace tidy, and the base game rides on the odd Fat symbol dropping in. It is a clean loop that suits longer sessions, though dry spells can bite given the volatility. When the book lights up, the gamble choices add a proper sweat without dragging out the flow.

The free spins round is where it sings for me. A roaming Fat symbol that grows through collections gives you a clear target, and the upgrade steps feel fair when the grid cooperates. I’ve levelled it part way on five spins and pushed deeper when luck allowed, and the ceiling at 5,000x feels realistic for this monster setup. If cluster games are your thing, Book of Monsters earns a spot in the rotation.