This is our own slot rating based on how popular the slot is, RTP (Return To Player) and Big Win potential.
Play the Book of Monsters free demo slot—no download required! Try Pragmatic Play’s latest game, enjoy risk-free gameplay, explore features, and learn game strategies while playing responsibly. Read our expert Book of Monsters slot review with ratings for key insights before you play.
Released:March 27 2025
Responsible Gaming
You have to be 18 years or older to play our demo games. Please confirm that you are of the legal age to proceed:
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Enter the eerie world of Book of Monsters, a thrilling cluster-pay slot by Pragmatic Play. Played on a 7x7 grid, this high-volatility game immerses players in a mysterious cave filled with quirky monsters and glowing specters. Featuring Fat Symbols, Free Spins, and a unique gamble feature, the gameplay offers dynamic and rewarding experiences. With an RTP of 96.5% and a max win of 5,000x your bet, Book of Monsters combines spine-chilling excitement with captivating visuals for an unforgettable gaming adventure.
Book of Monsters does not have the usual paylines but requires matching symbols in a cluster (a.k.a. cluster pays) instead. The game has several features including Bonus Bet, Buy Feature, Cluster Pays, Collect Symbols, Colossal Symbols, Extra Spins, Free Spins Gamble, Level Up, Special Symbols, and more. Book of Monsters also has a free spins bonus round and this is usually where you can win the big money.
The standard RTP (Return to Player) for Book of Monsters slot is 96.5% (Could be lower on some sites). This payback is good and considered to be about average for an online slot. Theoretically, this means that for every €100 put into the game, the expected payout would be €96.5. However, the RTP is calculated on millions of spins, which means that the output for each spin is always random.
The highest possible payout for this slot is 5000x your total bet which is pretty high and gives you the chance to win quite big wins. The maximum possible win is also calculated over a huge amount of spins, often one billion spins.
Book of Monsters is a volatile slot, and Pragmatic Play rates the volatility High (4/5). Volatility, in the context of slot games, refers to how often and how much a slot game pays out. Book of Monsters is designed to appeal to those who enjoy the adrenaline rush of substantial winnings that low volatility slots can't deliver, and are willing to accept the inherent risks of less frequent payouts.
Book of Monsters was released on March 27 2025.
This is our own slot rating based on how popular the slot is, RTP (Return To Player) and Big Win potential.
Yes! You can enjoy Book of Monsters in demo mode without signing up. Try our free version above to explore the features. For real money play, visit one of our recommended Pragmatic Play casinos.
To play for real money:
The slot offers a moderate max win of 5000x your stake.
Example: A €1 bet could return up to €5000.
Yes! Most of our featured Pragmatic Play casinos on this page offer welcome packages that include free spins or bonus cash usable on Book of Monsters. Always check the terms before claiming.
Absolutely. The game is fully optimized for mobile devices, including iOS and Android.
Yes, the demo mirrors the full version in gameplay, features, and visuals—just without real money payouts.
