Tchoukball (pronounced Chuke-ball) is played on an indoor court measuring forty metres by twenty metres (130 feet x 65 feet). At each end there is a 'frame' (a device similar to a trampoline off which the ball bounces) which measures one square metre and a semicircular 'D' measuring three metres (10 feet) out from the frame in all directions. Each team can score on both ends on the field, and comprises twelve players, of which nine may be on the court at any one time. In order to score a point, the ball must be thrown by an attacking player, hit the frame and bounce outside the 'D' without being caught by the defending team. Physical contact is prohibited, and defenders may not attempt to intercept the attacking team's passes. Players may take three steps with the ball, hold the ball for a maximum of three seconds, and teams may not pass the ball more than three times before shooting at the frame.