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Book of Monsters Slot Review
Introduction
Book of Monsters is a highly imaginative video slot from Pragmatic Play, launching players into a vibrant underworld filled with bizarre, cartoonish creatures. With a unique blend of cluster pays and expanding symbol mechanics, this game stands out from the traditional "Book of" slot formula. Built around a 7x7 grid, Book of Monsters invites players to uncover magical secrets, trigger oversized Fat Symbols, and chase thrilling win potential through dynamic free spins.
Game Features and Bonuses
Reels and Rows: 7 reels, 7 rows
Paylines: Cluster Pays (wins occur when 5 or more matching symbols connect horizontally or vertically)
Special Features:
Fat Symbols: Randomly selected symbols can expand into blocks ranging from 2x2 up to 7x7, covering more space and increasing the chance of massive wins.
Free Spins: Triggered by 4 to 7 Bonus symbols, awarding:
4 Bonus Symbols = 5 Free Spins
5 Bonus Symbols = 6 Free Spins
6 Bonus Symbols = 7 Free Spins
7 Bonus Symbols = 8 Free Spins
Fat Symbol Progression: During Free Spins, one symbol is chosen as the Fat Symbol. Collecting 25 of these symbols expands it to the next size and adds 2 extra free spins.
Ante Bet: Boosts your stake by 100% for a 7x higher chance to trigger free spins.
Feature Buy: Instantly access the Free Spins feature for 100x your current bet.
Game Statistics
Release Date: March 27, 2025
Game Type: Video Slot
Reels / Layout: 7x7 grid
Pay System: Cluster Pays
Max Win: 10,000x the bet
RTP: 96.06% (with alternative versions at 95.07% and 94.02%)
Volatility: High
Game Mechanics and Features
At the heart of Book of Monsters is the dynamic Fat Symbol mechanic. During both the base game and bonus round, one symbol may randomly expand to dominate the reels as a large block, replacing multiple symbols and significantly increasing win potential.
The Free Spins feature ramps this up. A random symbol is chosen as your Fat Symbol, and every 25 collected upgrades its size—starting at 2x2 and growing all the way to 7x7. Each expansion also awards extra free spins, keeping the feature alive and full of potential.
The Ante Bet is a valuable tool for players hunting features more frequently. When active, it boosts the likelihood of landing bonus symbols, which is helpful considering that 4 or more are needed to enter free spins.
Comparison to Other Pragmatic Play Slots
Sugar Rush: Also uses a 7x7 grid and cluster pays, with multipliers building up on winning spots. A sweeter, but less chaotic, vibe compared to Book of Monsters.
Gates of Olympus: Uses a tumble mechanic with random multipliers, but plays on a traditional 5x6 grid. Offers high volatility and big multipliers but lacks the visual flair of expanding symbols.
Book of Tut Megaways: Stays true to the “Book of” genre with expanding symbols, but operates on a more standard format with fixed paylines and a 6-reel Megaways system.
Book of Monsters is the outlier in this group — it fuses elements from cluster mechanics, evolving bonus symbols, and progressive upgrades to deliver a fresh gameplay experience.
Conclusion
Book of Monsters reinvents the "Book of" concept with humor, innovation, and a wildly dynamic 7x7 grid. The Fat Symbol mechanic is both unpredictable and rewarding, and the ability to grow these symbols through the free spins feature adds a layer of progression rarely seen in grid-based slots.
Strengths:
Unique Fat Symbol expansion system
Engaging visuals and monster theme
High volatility with a 10,000x win cap
Multiple bonus triggers and progressive free spins
Weaknesses:
High variance may not suit casual players
Base game can feel slow without feature triggers
Recommended for: Fans of cluster slots, players who enjoy progressive features, and anyone looking for something visually bold and mechanically unique.
Meta Description
Book of Monsters by Pragmatic Play is a 7x7 cluster slot featuring Fat Symbols, evolving free spins, and high volatility. Collect monsters, expand symbols, and win up to 10,000x your bet in this fantasy-themed grid slot.
