
This game is rated ESRB: Everyone.
River King: Mystic Valley is a fishing-focused role-playing game developed by Marvelous Entertainment and released for the Nintendo DS in 2008. The player takes on the role of a sibling searching for a mythical being known as the River King, whose power is needed to rouse a younger sister from an unexplained coma. The search takes players across a variety of aquatic environments, including rivers, swamps, ponds, and concealed fishing locations scattered throughout the game's world. Alongside fishing as the central mechanic, players can form bonds with the magical creatures inhabiting Mystic Valley, each of which offers distinct abilities that aid progression. The game blends sports-style fishing gameplay with RPG elements, making the mastery of casting and catching central to advancing the story and ultimately tracking down the elusive River King.