If you spot the crystal symbol, keep a close eye on it. This is the slot’s bonus symbol, and it only shows up on the first and fifth reels. Hit four of these in each of the corners, and you’ll trigger the game’s free spins round. Before this feature starts, a re-spin feature activates, which then resets to 3 respins with every new bonus symbol. Hit additional crystals during this feature, and you’ll receive extra free spins, sticky wilds, mystery symbols or win multipliers.