Rack ‘n’ Roll was the game for the 2007 FIRST Robotics Competition season, announced on January 6, 2007. In it, two alliances of three teams each compete to arrange toroidal game pieces on a central arena element known as ‘The Rack’.
The Rack ‘n Roll field is dominated by ‘The Rack’, a large metal contraption with three levels of hanging metal bars, with each level having 8 arms evenly spaced in an octagonal manner. Each arm (known as a ‘spider leg’) has space for two game pieces. Any more pieces placed on a spider leg beyond the first two are ignored for scoring purposes. At the beginning of the match, the rack is arbitrarily translated or rotated within three feet of the center of the field in order to give some randomness and to encourage autonomous modes that do not depend on dead-reckoning. At the top of the Rack are four green-colored lights above the 1, 3, 5, and 7 legs to aid in autonomous-mode tracking.
More information can be found on Wikipedia.Game Revel Animation