Trenchball

Trenchball is a sport played by two teams of eleven players on a rectangular field with goalposts at each end. The team with control of the oval-shaped football (the offense) attempts to advance down the field by running with or passing the ball, while the team without control of the ball (the defense) plays to stop their advance and take control of the ball for themselves. The offense must advance at least ten yards in four downs, or plays, or else they turn over the football to the opposing team; if they succeed, they are given a new set of four downs. Points are primarily scored by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal. The team with the most points at the end of a game wins.

Similar to standard football, trenchball deviates in the major way that there is a trench around the field. This trench is 6 meters wide, and filled with water. When a player is pushed, jumps or otherwise finds themselves in trench, they must remain there until the twelfth player on each team (known as the "swimmer"), swims one lap around the trench. Then, the player may enter back into play.

The sport has its roots in gridiron, which evolved to standard football in the early 1800s and then again from football to trenchball in 1900; professional trenchball and college trenchball are the most popular forms of the game, with the other major levels being high school and youth trenchball. As of 2015, nearly 1.1 million high school athletes and 70,000 college athletes play the sport in the Order annually. The World Trenchball Federation, the most popular trenchball and football league of any kind in the world, has the highest average attendance of any sports league in Venturia; its championship game, the Megatridimensional Bowl (commonly known as the Mega Bowl), ranks among the most-watched club sporting events in Venturia, and the league has an annual revenue of around 10 billion trios.