Showa Shinzan International Yukigassen, the de facto world snowball-fight championship, takes place yearly in Sobetsucho, Japan. Sebastian Moffett profiles the tournament on the front page of today’s Wall Street Journal. Players wear white jumpsuits and strap on a helmet for protection from the regulation snowballs between 2.56 and 2.76 inches in diameter. The game is combination dodge ball and capture the flag. Some teams practice year-round.