Head to Dolphin’s Island for some underwater adventure and try and hit a jackpot of 1,000 times your stake. That’s the chief attraction in this fishy-themed, 5 reel, 243 ways to win slot from iSoftBet. The big payout is on offer in the spin the wheel bonus feature. Look out too for the other feature that offers 15 free spins. Get swimming from 25p to £125 per spin.

Dolphin’s Island comes with a pair of features – first up is the Free Spins feature which is triggered when the dolphin logo symbol appears on reel 3. Once active, you’ll be given 15 free spins. Look out here for the fish which jump out from the sea and onto the reels and in the process turn multiple symbols wild. Some impressive payouts are possible here. We’ve managed to bag 140 times our stake after one especially lucky run.

Equally intriguing is the Bonus feature which is activated by landing 3 or more Bonus symbols anywhere on the reels. You’ll be taken to a new screen and given the chance to spin a wheel – the number of spins is determined by the number of Bonus symbol that triggered the feature.

The wheel is divided into segments that offer either a cash prize or a multiplier of up to 10x. Land on a multiplier and it will be applied to your previous cash prize – you’ll also be awarded another spin if you land on a multiplier. All told, prizes of up to 1,000 times your total stake are on offer here.

The visuals in Dolphin’s Island are simple but very nicely done. Set against an island backdrop the reels include a trio of brightly coloured fish alongside playing card symbols from A to 9. The puffer fish is the one to hope for here. It pays out 20 times your total stake if you land a five symbol combination. The smiling dolphin is the wild. It doesn’t offer any cash payouts but does substitute for all other symbols apart from the dolphin logo and bonus.

There are plenty of aquatic themed slots on the market – Dolphin’s Island doesn’t immediately stand out in that crowded field but it’s well worth further investigation thanks to the 2 feature rounds. The free spins especially is a cracker thanks to the added wilds. They’re not the easiest to trigger but when they do arrive, they can make a trip to Dolphin’s Island well worth your while. If you like dolphins, Dolphin’s Pearl Deluxe from Novomatic and Pearl Lagoon from Play ‘N Go are good options.