20+ years in the gambling industry including 13+ years playing and reviewing slots.
- Released on 27th March 2025 by Pragmatic Play
- 7x7 grid with Cluster Pays and Fat symbol feature
- Playable from 20p to £240 at top slot sites
The latest horror-themed slot from Pragmatic Play has arrived — and it’s as monstrous as the name suggests. Book of Monsters, now live at leading UK slot sites, offers a vibrant 7x7 grid experience that dials up the drama with Cluster Pays, colossal Fat symbols and win potential up to 5,000x your stake.
- RTP: 96.5%
- Max Win: 5,000x
- Volatility: Very High
- Stakes: 20p to £5
- Release Date: 27 March 2025
With a spine-tingling horror theme and colourful cartoon monsters, players must connect 5+ symbols to trigger a win. During any base spin, symbols can randomly expand in size from 3x3 up to 7x7. Landing 4 or more bonus symbols unlocks up to 8 free spins, and one symbol is chosen to become the Fat symbol — a supersized monster that can grow with collected matches.
The bonus round adds tension with a gamble feature: increase your free spins or boost the value of your chosen Fat symbol. Each level up adds more free spins as your Fat symbol bulks up to a monstrous 7x7 size. With a generous RTP of 96.5% and a very high volatility rating, the game will appeal to those who like to chase chunky cluster wins.
You can try the Book of Monsters demo slot now, or spin for real cash on the best slot games reviewed by OLBG.
Chris Taylor
The King of Slots
