“Pyatachok in the Underwater Kingdom” is a sequel to the series of educational games by “Buka” Company. The former pirate Silver decides to build a Marine Water Park. But there is one problem: this requires real marine inhabitants. So Silver asks Pyatachok to set out for a world tour full of striking adventures in order to find marine inhabitants for the Park.

Pyatachok needs your help to gain new skills from the ship's log of Silver, answer many interesting questions and persuade marine inhabitants to move to the Water Park.