Giant Mammoth Overlay × GIANT PRIZES! Giant Mammoth™ is part of the “Voltage Vault™” game series. The combination of a pre-historic, ice-age feel and new features and bonuses will have Giant Mammoth players surely winning giant prizes! Wild symbols substitute for all symbols (except bonus) Reels 2, 3, and 4 randomly selected for Wild Reel Reward! Wild symbol triggers entire reel becoming WILD! 3 or more bonus symbols trigger free spin bonus Win up to 2X multipliers and 12 free spins!