FIRST Lego League Challenge

At the beginning of the competition season, FIRST sends a set of official competition materials to each registered team, consisting of a 'challenge mat', LEGO electronic and mechanical components, and instructions for building the items for the mat (collectively known as the Challenge Set, formerly the Field Setup Kit). The teams also receive a list of tasks, called 'missions', to complete involving each model on the mat (e.g. taking a loose piece from one model and placing it inside another). The FIRST LEGO League Challenge gives teams complete freedom on how to complete the missions, providing that they are completed by a programmed LEGO Education robot with no outside assistance. The robot has two and a half minutes to complete the missions; called the Robot Game. Each team has a minimum build period of 8 weeks to analyze the challenge mat, design and build a LEGO Education robot, and program it to fulfill the given missions in any manner they see fit. The robot must be autonomous, and may contain only one LEGO Education programmable block and no more than four motors. In addition to the live robot run, or Robot Game, the competition has three additional judged sections with the purpose of providing teams with feedback on their achievement of the FIRST LEGO League Challenge learning objectives. The first judging session, Core Values, Table performance playing field. When the official competition convenes, each team brings their robot to compete on an official challenge mat identical to their own. Two to four team members are allowed at the board during a match; however, they can switch out with others in the team. In the case of a serious problem, such as the entire robot breaking down, the entire team is allowed at the board for as long as the problem persists. Members are not permitted to bring additional robots or any other items to the board during the competition. The robot starts in one of two areas marked as 'base', a white area in each bottom corner of the mat. While at base, two team members are allowed to touch the robot and start programs. If the team touches the robot outside of base (an 'interruption'), the referee will issue a penalty, resulting in the removal of a Precision Token. These are stationary LEGO models that increase the final score if they remain until the end, providing an incentive to not interrupt the robot. The robot is not required to return to base; some teams have completed all their missions without returning to base during the time allowed to complete the missions. In fact, in the 2008–09, 2009–10, 2011-13 and 2021 challenges, points were awarded if the robot was in one of two specified areas, not including base, at the end of the two and a half minute match. Parts and Robotic platforms FIRST LEGO League Challenge teams may use "any LEGO-made building parts in their original factory condition" to construct their robots. The robots are programmed using any language allowing autonomous movement. Many teams opt for a block-based programming environment such as the official EV3 software, the official NXT-G software (now outdated), or Robolab. All these are built around Labview. The robots used are Lego Education units. Until 2021, the platform of choice was the Lego Mindstorm EV3. While the EV3 will still be permitted in FLL competitions, starting in August 2022, the Guided Mission will only be available for SPIKE Prime. ==Events==