Book of Monsters

Book of Monsters is a cheeky monster-themed slot that leaves the usual book format behind. Instead of lines or ways, it uses a cluster-pays grid, where wins form when matching symbols touch in a group. A tumble mechanic removes winning symbols and drops new ones in, so one spin can produce a chain of wins.

The book idea appears as a Fat Symbol, a block that starts small and can grow to dominate a large part of the grid. In the free spins round, which opens with scatters, the Fat Symbol can grow further, and each growth step can bring extra spins. A gamble choice can also appear, shaping the round toward more spins or a better Fat Symbol payout tier.

It may suit cluster fans who like a different take on the book idea. The published RTP is 96.50%. The free demo uses play credits, no real money, and every result is random.