Blitzball is a fictional underwater sport featured in the video game Final Fantasy X. It combines elements of soccer and water polo, played in a spherical arena filled with water. Two teams of six players compete to score goals by getting a ball into the opposing team's net. Players can perform various techniques, such as passing, shooting, and tackling, to outmaneuver their opponents. The game is played in two halves, and the team with the most goals at the end wins. Blitzball is a popular mini-game within Final Fantasy X, adding depth to the overall gaming experience.