Jett Tailfin is an underwater racing game that tells the story of a lovable fish who, accompanied by his friends, competes to win a quirky underwater competition. The game allows players a full range of control with multiple shortcuts and additional landscapes as racers attempt to find the best route to the finish line. Players have the option of challenging friends and choosing from a large variety of different types of fish to race, each mimicking true-to-life attributes of real fish.

Racers will speed through a variety of environments set up as exotic ecosystems, such as Atlantis Metropolis, Hawaiian Islands, Ship Graveyard, Pirate's Island, and more. Sea-loving friends such as electric eels and octopuses will attempt to prevent fish from finishing each race, and are utilized by players to gain advantage over their opponents.