Get your feet wet in Reef Run, an underwater-themed slot from Yggdrasil Gaming. Set in a magical ocean kingdom, this 5 reel, 20 payline title comes with free spins and big multipliers. Dip your toes into the water from between 20p and £40 per spin.

The reels in Reef Run are filled with 6 high-paying fishy symbols including brightly coloured crab, lobsters, sea snails, sea horses and octopuses. The ugly green puffer fish is the most lucrative, offering payouts of 1,000 times your line bet if you manage to find 5 in a winning payline. There are no wilds to speak of.

The principal attraction in this fishy favourite is the impressive Free Spins feature. Find 3 free spin symbols and you’ll receive 10 free games. Four gives 20 free spins with five offering a mighty 60 free spins. Once the free spins round is active, you’ll notice 3 spaces on either side of the reels. Keep an eye on these as they’ll reveal some useful multipliers.

Whenever you hit a winning payline, that winning fish will offer a multiplier next time it’s part of a successful combination. The multipliers increase every time your fish is a winner. It starts at 1x then jumps to 5x then 10x and finally 20x which can give a payline a massive boost.

It’s possible to re-trigger the free spins by finding two or more scatter symbols during the feature. Two scatters gives two free spins. Three or more offer the same number as the base game.

The variance in Reef Run is on the low side of medium which is rare for Yggdrasil Gaming which usually produces more highly volatile slot.

There are plenty of aquatic themed games available to online slot players already but Reef Run is a welcome addition. The sound and visuals are excellent and they’re matched by the rapid-fire gameplay.

It may not be packed full of features but the free spins hit often enough to keep the pace high. If you manage to re-trigger the free spins and build a multiplier up to the maximum 20x, then it’s certainly possible to make a splash and net a bumper catch of coins. If you like underwater themes, Lucky Angler by NetEnt is worth playing – I also recommend Lucky Larry’s Lobster Mania by IGT which is quirky and a land-based classic.