ULTRA STACK™ PANDA INSTANT TRIGGER: Offers immediate feature gameplay with the highest payouts. Free game feature types are available according to play option selected. At the start of any feature, a mini-game reveals a symbol that is increased on the reels for the free games regardless of play option. When playing the game at higher play options, the revealed symbol is further increased via a wheel spin. Choosing the highest play option automatically triggers one of the free game features.