Goalball is a game played by two teams of three players with a maximum of three substitutions on each team. It is open to both male and female visually impaired athletes, and sighted players can also play domestically. It has three main distinguishing features:
- All players wear eyeshades so that they are totally blindfolded
- Goalball is played on an indoor court that is 18m long and 9m wide. The court has tactile markings (string that is taped to the floor), which helps players determine where they are
- The ball contains internal bells, which help players locate it during play.
The object of the game is to score a goal by bowling the ball along the floor so that it crosses the goal line of the opposing team. The defending team has to prevent the ball going in to their goal by stopping it while remaining in their team area. They must then try to control the ball and attack by bowling the ball back again thereby trying to score in the other goal.