Enter a whimsical yet mysterious world in Book of Monsters, where enchanting creatures guard ancient secrets within a shadowy forest. This 5x3 slot operates on 10 fixed paylines, featuring a magical Book symbol that serves as both the wild and scatter, completing combinations and unlocking bonus features. Landing three or more Book symbols triggers the highly sought-after Free Spins round, which begins with a randomly selected special expanding symbol. This symbol expands to cover entire reels when enough instances land, leading to potential screen-filling wins in this high-volatility, "Book of" style adventure.