Turning base metal into gold is the name of the game in Secret Elixir, a 5 reel, 10 payline slot from Novomatic. This alchemy-themed title comes with a free games round that offers multipliers of up to 20x. Enter the lab from between 10p and £100 per spin.

The first thing to notice about Secret Elixir is the slightly unusual set-up of the reels. Reels 1 to 4 are standard offerings but the 5th reel is filled with a selection of multiplier symbols ranging from 2x, 3x and 5x. If the multiplier appears in a winning payline, the win will be boosted by the amount shown.

The bespectacled scientist is the wild and substitutes for all other symbols apart from the scatter. It’s also the biggest payer, offering 1,000 times your line bet if you find a 4 symbol combination. The other two scientists will pay 200 times your line bet. Throw in the multiplier in reel 5 and results can be very impressive.

Secret Elixir also comes with a Free Spins feature which is triggered when 3 or more gemstone scatter symbols appear anywhere on the reels – you’ll be awarded 12 free spins. What makes the feature so interesting is the 5th reel. The multipliers on offer in the feature are much larger than the figures on show in the base game. They will boost winning paylines by 2x, 3x, 5x, 10x right up to 20x! That’s a potential 20x boost to your win on every free spin.

Like most Novomatic slots, Secret Elixir is pretty volatile with the variance on the high side of medium. The free spins don’t hit all that often but can be very rewarding when they do arrive, especially if you manage to find winning combos with the big multipliers.

Secret Elixir won’t win any awards for its visuals (which are okay) or sound (which will have you clicking the mute button) though. The fast-paced play and big multipliers make it worth a closer look though. Get lucky with the magic potions and the results can be explosive. It’s a decent addition to the Novomatic online slots portfolio but I prefer other titles such as Lord of the Ocean or Lucky Lady’s Charm Deluxe.