ABOUT
Book of Monsters tears up the rulebook—literally—and replaces it with a chaotic, creature-filled grid where the monsters aren’t hiding under the bed… they’re paying out on the reels. This 7x7 cluster pays slot from Pragmatic Play tosses you into a cavern of colorful weirdos and oversized surprises. Wins explode when five or more matching monsters huddle up, and with symbols that can swell into ridiculous 7x7 beasts, things can go from quiet to monstrous real fast. With high volatility and a 96.50% RTP, this beastly book has a 5,000x payout lurking between the pages—if you’re brave enough to crack it open.
Betting Options and Bonus Features
Book of Monsters may look playful on the surface, but it’s packed with mechanics that bring some serious heat. The chaos begins with the Fat Symbolsfeature, which randomly spawns oversized symbols during the base game. These chunky icons can grow from 3x3 to a monstrous 7x7 size, creating huge clusters that can wipe the grid clean in one go.
Triggering the Free Spins round requires 4 or more scatter symbols, which awards 5 to 8 free spins depending on how many scatters land. Before the round kicks off, one regular symbol is randomly chosen to become the Fat Symbol during the bonus. If you’re feeling gutsy, you can activate the Gamble Feature—a risky move that lets you gamble either the number of spins or the chosen symbol. Win, and you could upgrade; lose, and the entire bonus vanishes. Not for the faint of heart.
During Free Spins, the selected Fat Symbol doesn’t just sit still—it moves to a new position on every spin. The more of these symbols you collect, the bigger it gets, with the growth unfolding as follows:
- Collect 30 symbols: Grows to 2x2
- Collect 27 more: Grows to 3x3
- Collect 24 more: Grows to 4x4
- Collect 20 more: Grows to 5x5
- Collect 16 more: Grows to 6x6
- Collect 12 more: Grows to the massive 7x7
Each upgrade also adds 1 to 3 additional spins, so the deeper you go, the more monstrous the potential becomes.
For players who want to increase their odds of triggering the bonus, the Ante Bet feature boosts your chances significantly, multiplying the odds by seven. Or, if you’re not the patient type, the Bonus Buy is available at 100x your bet, launching you straight into Free Spins without any waiting around.
Rohtein’s Take
Book of Monsters caught me off guard—in the best way. The Fat Symbols mechanic adds a whole new level of tension, and when those monsters start growing, it gets wild real quick. I like that it’s not just about spinning; there’s actual buildup and progression, especially in the bonus round. The gamble feature can be brutal, but it also adds a serious edge. It’s risky, unpredictable, and when it hits, it hits hard. Definitely one of the more creative twists on the “book” formula I’ve seen—and yeah, I’ll be opening this one again.
