To activate Free Spin Mode, simply land 3 Free Spin Symbols. To start with, you'll be given a total of 3 free spins. However, every time you land a winning symbol, you'll receive an additional 3 free spins. Within the round you'll discover symbols which are completely unique to the bonus game.
Each of these carry several multiplier possibilities. Meaning they could multiply your prize by several different amounts. These symbols include Cranky Cat, Epic Cranky Cat, Sketchy Skull, and the Epic Sketchy Skull.