Players vie for the ball in the annual Swamp Soccer World Championship in Hyrynsalmi, Finland, on Saturday. Swamp soccer first emerged in Finland in 1998 when officials in the town of Hyrynsalmi decided to take advantage of their surrounding swampland with a swamp soccer tournament. The idea is believed to be derived from a military training exercise. In the six-to-six game, players go to swamps full of dirt intentionally and try to make goals in deep, dark brown mud. Xinhua/European Pressphoto Agency