Dr Jekyll is the wild symbol and can land on reels, two, three and four. If it will help to form a win he will expand to transform into Mr Hyde and occupy all positions on the reels.
The green potion is the scatter symbol and is the key to the free spins.
When three or more scatter symbols land anywhere on the reels the free spins begin. You can choose from two different free spins games. The Jekyll Spins offers an increasing multiplier each time that a scatter lands on the fifth reel. It will increase from 1x to 2x to 3x and finally 5x. The Hyde Spins offers extra wild symbols. Each time that a scatter symbol lands on the fifth reel one of the character symbols turns wild for the rest of the round. Furthermore, all standard symbols can land stacked. However, in both games each time that the scatter lands on the fifth reel part of the potion pot next to the reels is consumed and the free spins will end after four hits.
If you want to make it easier to trigger the free spins you can turn on the feature bet. It doubles your total bet but when on the scatters can trigger the free spins even when they are one position above or below the reels.
Jekyll & Hyde offers a top payout of 1000x for landing five of the male character symbols along a payline. The woman in red and the woman in blue can both payout up to 300x, while the hat and cane, and the notebook can both payout up to 150x.