As the toddler-focused sister company of Toca Boca, Sago Sago has produced a succession of fab apps in 2013. It’s ending the year with a splash – literally – with Sago Mini Ocean Swimmer.

It’s a bit like one of the company’s previous apps, Sago Mini Forest Flyer, except while that involved a bird flying around a forest, this is about a fish called Fins swimming through an underwater environment.

“Guide Fins through the water and discover dozens of fun surprises. Dive into sunken treasure, meet mysterious monsters and enjoy a treat at an underwater ice cream stand,” explains its App Store listing.

As with the forest app, it’s beautifully simple for young children to use: they simply drag their finger where they want Fins to go on-screen, looking for hotspots that trigger different animations. There’s no storyline other than the ones you and your children come up with, which is part of the design.

Sago Mini Ocean Swimmer costs £1.99 for iPhone and iPad on Apple’s App Store.