Swimming away with chests full of underwater treasure is the goal in Dolphins, a 5 reel, 30 payline slot from Ainsworth. The likeliest way to do that is via the bonus round which awards up to 15 free spins with stacked wilds that can land on the middle 3 reels. Play on your PC, tablet or mobile device from between £1.20 or £48 per spin.

Ainsworth has kept things very simple in Dolphins. There’s a no frills feel to the design. Set against the deep blue of the sea the plain white reels include A to 9 symbols plus a selection of objects relating to the ocean theme. They include shells, pearls, tropical fish and treasure chests.

The golden galleon is the most rewarding standard symbol. You’ll receive an award of 1.67, 3.33 or 33.3 times your total stake if you land 3, 4 or 5 of them on the same payline. Appearing on reels 3, 4 and 5 only in the base game, the dolphin is the wild. It doesn’t offer any pays in its own right but it does replace all other symbols bar the scatter and can land in full stacks.

Landing 3, 4 or 5 of the coin scatter will get you a payout of 2, 10 or 100 times your total stake as well as triggering the game’s Free Games feature. On offer are 10 free spins. The slight difference here is that the stacked wilds can appear on the middle 3 reels rather than reels 3, 4 or 5. You can re-trigger more free spins here too. Landing 3 scatters adds 5 extra free spins to your total.

Ainsworth slots are often stripped back affairs but Dolphins is especially simple. The sound and visuals are pretty basic and the gameplay offers few flourishes. It’s not an especially volatile game either. The variance is in the medium range.

We found Dolphins to be a rather dull take on the classic underwater themed slot. The design is average and the features offer little in the way of excitement. Dolphins is a slot for Ainsworth fans only. Novomatic’s Dolphin’s Pearl Deluxe or Iron Dog Studio’s Siren’s Kingdom offer better underwater adventures.