The bonus is triggered when all 5 reels land 'clumped' symbols (3 of the same symbol).

Stop a flashing reel at random and this reel (and any with the same symbol) are held whilst all remaining reels are re-spun to either 1, 2 or 3 of that symbol, creating a guaranteed win! The bonus can be triggered simultaneously with normal reel wins. Landing a full house will therefore award x2, even for the Jackpot!

If the reels are symmetrical when the bonus is awarded, the Symmetry^® bonus is awarded, which guarantees a full-house!