Much like WRO, FIRST LEGO League (FLL) is a mission-based competition that changes yearly, but on a more mechanically complex scale.
FLL presents multiple missions for robots to tackle, often involving interactive field elements. Successful completion of a specific mission awards points. However, teams are allowed to change robot attachments in the starting base an unlimited number of times throughout the 150 second run time, which incorporates the need to strategise which mission to prioritise in order to score the maximum number of points within the time limit.
Teams will also have to conduct presentations that demonstrate the FLL core values such as research and community outreach etc., which will be counted towards the final overall rankings.