Tennis polo
The sport is played on a grass field between 80 and 100 yards long and 50 to 65 yards wide. The goal area is a semicircular line with an 11-yard radius and the penalty mark at 13 yards from the goal. An experimental rule has a second semicircular line on the field with a 17-yard radius. Generally, a field for gridiron football or soccer can be used.
ZFOOTBALL
The official field is 25 yards wide and 64 yards long. Each end zone is seven yards deep. Games consist of two fourteen-minute halves. Teams have one time-out per game, which stops the clock. In the last minute of the game, if the difference in score is less than 10 points, a pro clock is used (stoppage on out of bounds, incomplete passes, defensive penalties, and scores). Teams have four players each on the field, and can have rosters of up to six players. Substitutions are unlimited, and can be made between plays.