Pragmatic Play has launched Book of Monsters, a cluster-pays slot where symbols measuring up to 7×7 can randomly hit on any spin in the base game.

Landing 4-7 scatters triggers the bonus game with 5-8 free spins, where a random symbol is chosen as the FAT symbol. Before free spins commence, a gamble feature offers players the chance to increase the number of free spins and upgrade the FAT symbol to the next highest-paying symbol.

During the feature, the FAT symbol moves to a new position on each spin. Every landed symbol matching the FAT symbol is collected in a meter. As these accumulate, the FAT symbol can increase in size to 2×2, then 3×3, and so on up to 7×7, awarding 1-3 extra spins each time it grows.

Book of Monsters is the latest addition to Pragmatic Play’s award-winning slots portfolio following the release of Big Bass Return to the Races and 5 Lions Megaways 2.

“Book of Monsters is an exciting and visually rich slot that can deliver supersized symbols on any spin and wins of up to 5,000x,” said Pragmatic chief operating officer Irina Cornides.