Book of Monsters

Book of Monsters by Pragmatic Play is a video slot built on a 7×7 grid with a cluster-pays win system, meaning matches of at least five identical symbols that touch vertically or horizontally award wins. The theme is whimsical fantasy, featuring colorful monster creatures, magical books and a glowing cave backdrop that’s playful rather than dark or ominous. A standout feature in the base game is the random appearance of “Fat Symbols” – oversized versions of regular symbols that can land in sizes from 3×3 up to 7×7, creating big clusters. Free Spins are triggered when you land 4, 5, 6 or 7 Bonus (scatter) symbols; they award 5, 6, 7 or 8 free spins respectively. Before the Free Spins start, you get the choice to gamble for either more spins (up to 8) or a higher-paying Fat Symbol; failure in that gamble sometimes ends the bonus. During the Free Spins feature a randomly chosen symbol becomes the Fat Symbol, beginning at 1×1, and shifts position each spin; matching instances of that symbol are collected and after certain thresholds the Fat Symbol expands through sizes up to 7×7, with each growth also granting 1-3 additional free spins. There is an Ante Bet option that increases the chance to trigger the Free Spins feature (for example triggering with only 3 Bonus symbols instead of 4 or more) by paying a larger stake. There is also a Bonus Buy or Feature Buy feature allowing immediate access to the Free Spins round by paying a set multiple of the current bet. The maximum win potential in Book of Monsters is capped at 5,000× the bet.

You can try it for free in demo mode or play it for real money.