Wilds and Scatters are special symbols that can appear when you play a slot game. In short, a wild is a game symbol that can stand in for other symbols and increase your chances of getting that much-desired five-of-a-kind win. Scatters, on the other hand, can never be replaced by wilds but can take effect no matter where they land. Some games can offer scatters with winning combos, like in the case of this slot game, where the Book of dead scatter can unlock free spins.