Casino
Book of Monsters
Pragmatic Play, 7x7 grid, cluster pays
About Book of Monsters
Monster-themed cluster pays slot with the unique Fat Symbol mechanic, during free spins, a chosen symbol starts at 1x1 and grows by collecting matching symbols up to 7x7. Pre-Bonus Gamble lets you risk for more spins or a higher-value Fat Symbol. 4-7 scatters trigger 5-8 free spins. Hit frequency 1 in 4.31.
Book of Monsters is a video slot from Pragmatic Play that triggers its primary feature when specific symbols land on the reels. The feature awards 5-8 free spins, during which one symbol becomes selected at random for enhanced payouts. The game includes a gamble mechanic that lets players risk their current free spin total for a chance to increase the count or upgrade to a higher-paying Fat symbol variant. This risk-reward structure creates decision points throughout the feature round.
Book of Monsters: how to start
Book of Monsters runs in the browser with no download. Sign in, set a stake, and bets settle against your crypto balance at round close.
Set the bet per spin before you play; the in-game paytable lists symbol values and bonus triggers. Deposits in BTC, ETH or USDT credit after network confirmation, and withdrawals go back to your own wallet.
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Frequently Asked Questions
What does the Fat Symbol mechanic do during free spins?
During free spins, you select one symbol that starts as 1x1 and grows larger each time you land a matching symbol, expanding up to 7x7. The larger the Fat Symbol becomes, the more winning clusters it can form on the 7x7 grid.
How many free spins do I get, and what triggers them?
Landing 4 to 7 scatters triggers 5 to 8 free spins respectively. The more scatters you land, the more spins you receive.
What is the Pre-Bonus Gamble, and when can I use it?
Before your free spins begin, you can gamble to either increase your total spin count or boost the starting value of your chosen Fat Symbol. You decide whether the extra risk matches your stakes.
How often should I expect to land winning combinations with a hit frequency of 1 in 4.31?
You hit a winning cluster roughly once every 4.31 spins on average. With very high volatility, actual results vary significantly over short sessions, so expect longer dry stretches between wins.
Can the Fat Symbol reach maximum size and still grow larger during free spins?
No, the Fat Symbol caps at 7x7, which is the full grid size. Once it reaches 7x7, additional matching symbols still trigger wins but do not expand it further.
