Fishing Master follows the journey of Cocoto as he attempts to stop the magical kettle from overflowing and defeat the evil Zaron. Cocoto's quest is to wake the sleeping god Geo, and he must retrieve five pieces of bait that are necessary for this task.
The gameplay of Fishing Master revolves around catching fish. To do so, Cocoto must first find a good spot, then cast his line and move it around until the bait catches the attention of a fish. Once the fish is caught, it must be reeled in. The game features different types of fish that can be sold for diamonds, which can then be used to buy new fishing rods and bait.
Catching all five types of fish and bringing them to the hermit turtle allows Cocoto to access special bait that can catch level-specific boss fish. By defeating these boss fish, Cocoto unlocks new areas in his quest to defeat Zaron and wake Geo.