Free Games Feature 

10 free games are triggered by any 3 or more scattered ‘Twice the Diamonds’. ‘Vault’ substitutes for all symbols except scatters and ‘Key’ and appears on reels 2 and 4 only during the free games. When ‘Vault’ appears, it is held in that position until the completion of the feature. During the free games, ‘Key’ appears on reel 3 only and substitutes for all symbols except scatters and ‘Vault’.  If ‘Key’ substitutes in a winning combination, the pay for that win is multiplied by the ‘Key’ multiplier.