The game is played on a field known as the "Crater", which is a 54-foot by 27-foot (16 × 8 m) carpeted rectangular field. The majority of the Crater is covered by a 50-ft by 24-ft (15 × 7 m) low-friction surface known as "Regolith". Two alliances, one red and one blue, composed of three FIRST Robotics Competition teams each, compete in each match. The object of the game is to attain a higher score than your opponent by placing the game pieces in the trailers hitched to the opposing alliance's robot. The game is made up of two scoring periods. The first 15 seconds of play is the Autonomous period, in which robots operate according to pre-programmed instructions. The next two minutes of play is the Teleoperated period. At this time, robots are radio-controlled by team operators standing at either end of the field.