Mahjong Fish World is a challenging and fun underwater runner game. Players control a fish as they swim through a series of levels, matching mahjong tiles to remove them from the board. As players progress, they will encounter a variety of obstacles, including sharks, jellyfish, and coral reefs. Players must use their skills to avoid these obstacles and collect as many stars as possible. The game features a variety of levels, each with its own unique challenges. Players can also compete against their friends for the highest score.