The Scatter symbol acts as a Wild, and substitutes for all other symbols. 3 or more Scatter symbols trigger Free Spins. An initial 8 free spins are awarded.
1 regular symbol (except Scatter) is chosen at random to become a special Expanding Symbol in Free Spins. When enough of the respective symbol lands, they expand to cover all reel positions. These symbols do not need to appear adjacent to result in extra wins.
3 or more Scatter symbols re-trigger Free Spins. An additional 8 free spins are awarded. An additional special Expanding Symbol is chosen at random.