One of the online industry’s quickest-developing mobile and desktop casino game providers, Pragmatic Play, has hit the refresh button with Book of Monsters, a new cluster-paying grid slot. 

The new release does not follow the standard “Book of” path from the creator of Bow of Artemis, Gates of Olympus, and Wisdom of Athena, where special symbols are seen expanding and taking over the reels. 

Instead, the publisher took a different approach, creating a slot where books can flip open to showcase free spins and random symbols that can later expand in the bonus round. 

Book of Monsters Metrics Overview

Rows: 7

Reels: 7

Paylines: Cluster Pays

Volatility: High

Max win: 5,000x

RTP: up to 96.50%

Min/Max Bet: 0.20-480

Release date: March 27, 2025

Join the Spooky Adventure and Win Up to 5,000x

The colorful, charismatic monsters look charming and are always ready to trigger juicy cluster pays action, making the game one of the studio’s quirkiest releases so far.

The light-hearted soundtrack nicely complements the feel-good vibe of the colorful graphics and symbols, maintaining Pragmatic Play’s tradition of quality games that look phenomenal.

The game features generous wins of up to 5,000x. To score a win, you must match at least five symbols. 

The game counts seven regular paying symbols, both low-paying Royals that pay 0.2x to 150x for clusters of 5-49 matching symbols and three high-paying Monsters that pay 0.5x to 5,000x for clusters 5-49 clusters.

Compared to the majority of classic cluster pays games, Book of Monsters will not use winning combinations to trigger cascading symbols. Also, no Wild symbol is included in the gameplay. 

During tandem vase game rounds, symbols of 3×3, 4×4, 5×5, 6×6, or 7×7 sizes can, however, randomly show up during each new spin. 

Landing between four and seven bonus symbols will activate a free spins feature with five to eight free spins. 

The Bold symbol will be randomly chosen from all the symbols. Prior to the start of the bonus round, you can try to get your hands on up to eight more free spins or a Bold symbol with a more generous value. 

During the free spins round, the Bold symbol will be seen expanding to up to 7×7 once a sufficient number of matching symbols will show up on the reels. 

This means the game will award an extra one to three free spins every time.