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Rules PDF Print E-mail

Every Rule has a purpose!

The Missions are an exercise in creative and strategic thinking, but the Rules are your crucial guidebook to earning those all important points.

The Rules are your toolkit for success, so even a rule that may seem trivial could be the difference between successfully completing a Mission or not. Don't ignore Rules that tell your team where to stand during competition, when to touch the robot, or how to handle robots that get out control.


Red Square Gracious Professionalism

  • You are “Gracious Professionals.”  This means you are competing hard against PROBLEMS,while treating PEOPLE with respect and kindness - people from your own team as well people from other teams.
  • You build onto other people’s ideas instead of resisting or defeating them.

Read more about Gracious Professionalism


Red Square Purpose

Interest in engineering innovation…

  • FLL is a technical experience so fun, you forget it’s technical.  Soon you realize technical is fun - and want more.
  • FLL uses competition as an exciting motivator to get you to come up with ideas, solutions, processes, and inventions no one has ever seen before.

Red Square Autonomy

  • The FLL Robot Game is to be played by an “autonomous” robot.  That means you’re not supposed to influence it while it’s doing its work.
  • But most teams need to intercept their robot once or more during the match.  So you’re allowed to do that, but it always forces a restart from Base, and sometimes, there’s a penalty.

Red Square If A Detail Isn’t Mentioned, Then It Doesn’t Matter

Assuming you have read all the missions, rules, and Game Q&A carefully…

  • If no particular method is required, then any method is okay.
  • If something is not specifically required, then you don’t have to do it.
  • If there’s no restriction against something, then it’s allowed.
  • There are no hidden requirements or restrictions.
  • But there are hidden freedoms - in what the rules do not say.

Red Square 1 - Participation

  • The maximum allowable team size is ten members, not including coaches and mentors.
  • See the FIRST LEGO LeagueCoaches’ Handbook for allowable ages.
  • At the tournament, only two team members at a time are allowed right up at the competition table except during repair emergencies.
  • The rest of the team must stay back from the table, but close enough for different members to tag in or out as desired at any time.  Specific positioning is decided by the head officials running each tournament.

Red Square 2 - Parts

This rule is not only about the robot.  It also covers all of the attachments and strategic objects you bring to the competition area…

  • Everything you compete with must be made of LEGO elements in original factory condition, except LEGO string and tubing, which you may cut to length.  Exception: You can reference a paper list to keep track of programs.
  • There are no restrictions on the quantities or sources of non-electric LEGO elements, except that factory-made wind-up/pull-back “motors” are not allowed.  Pneumatics are allowed.
  • The electric elements used must be the LEGO MINDSTORMS type, and the total number of electric elements you may use in one match is limited as follows:
For RCX users:
For NXT users:
RCX controller (1)  
NXT controller (1)
motors (3)   
motors (3)
touch sensors (2)  
touch sensors (2)
light sensors (2)      
light sensors (2)
lamp (1)       
lamp (1)       
rotation sensors (3)     
rotation sensors (3 minus the number of NXT motors present)
3rd touch OR light sensor (1)     
ultrasonic sensor (1)
  • Example 1: If your robot has three motors, you may not have any other motor in the competition area, even if it’s only for weight or decoration; even if it’s in a box, off the field.
  • Example 2: If your robot has two motors, but you have multiple attachments to motorize, you must design a way to switch the 3rd motor from one attachment to the next.
  • LEGO wires and converter cables are allowed as needed.
  • Spare/alternate electrical parts are allowed in the pit area.
  • Computers are not allowed in the competition area.
  • Objects functioning as remote controls are not allowed anywhere.
  • Marker may be used for owner identification in hidden areas only.
  • Paint, tape, glue, oil, etc. are not allowed.
  • Stickers are not allowed except LEGO stickers applied per LEGO instructions.
  • You are not allowed to use more than one robot in a single match, but it’s okay to use a different robot in a different match.
  • If a robot is in violation - of this rule or the SOFTWARE rule - and cannot be corrected, the decision about exactly what to do rests with the head officials at the tournament, but that robot may not win awards.

Red Square 3 - Software
  • Your robot must be programmed using LEGO MINDSTORMS, RoboLab, or NXT software (any release).
  • Patches, add-ons, and new versions of the allowable software from the manufacturers (LEGO and National Instruments) are allowed.
  • Text-based and/or “outside” software is not allowed.
  • The point of this rule is the same as that of the MATERIALS rule: Since we can’t ensure equal coaching for all teams, we at least limit this unfairness by capping the power of the tools.

Red Square 4 - Downloading And Wireless Signals

  • Downloading programs to robots must take place in the pits only - never in the competition area.
  • Teams downloading to an RCX robot must make sure the process is shielded, that there are no other RCX robots in range, and robots should be turned off when not in use.
  • Teams downloading to an NXT robot must do so by cable. Bluetooth must be switched off at all times.

Red Square 5 - Field

  • The field is where the Robot Game takes place.
  • It consists of a field mat, on a table, with mission models arranged on top.
  • The field mat and the LEGO pieces for building the mission models are part of your Field Setup Kit.
  • The instructions for building the mission models are on a CD which comes in the same box as the LEGO pieces.
  • All other field setup instructions are on the Field Setup page.

Red Square 6 - Base

  • Base is a VOLUME. Base is not just an area on the mat.
  • Base is an imaginary box formed by vertical walls that rise from the perimeter of the Base area, including the inside surface of the border walls, and by an invisible ceiling 16 in (40 cm) high.
  • Base is where your robot is prepared and handled.
  • Base is where your robot always starts and restarts from.
  • Base is often a scoring target.

Rule 6 - Base


Red Square 7 - Variability

  • As you build and program, keep in mind that our suppliers, donors, and volunteers make every effort to ensure that all fields are correct and identical, but you should always expect some variability, such as:
    • flaws in the border walls.
    • variety in lighting conditions.
    • texture/bumps under the mat.
    • waviness in the mat itself - at many tournaments, it is impossible for the mats to be rolled out in time to lose their waviness. Location and severity of waviness varies. You are being warned here. Consider this while designing.
  • Two important building techniques you can use to limit the effects of variability are:
    • Avoid steering systems that involve something sliding on the mat.
    • Cover your light sensors from surrounding light.
  • Questions about conditions at a particular tournament should be asked of that event’s head officials.

Red Square 8 - Mission

  • A mission is defined as a result or action worth points.
  • You decide the order you want to try missions in, and you don’t have to try them all.
  • You’re allowed to re-try them, but often it’s not possible.

Red Square 9 - Match

  • At a tournament, two Robot Game fields are joined back to back, and you are paired opposite another team to compete in a match. Here’s the process:
    • You arrive at the competition table and have at least one minute to prepare your robot.
    • The match starts and you start your robot. Once started, the robot is now “active” and is understood to be working on missions.
    • The robot may get a lot done, or a little, but eventually you are likely to need/want to handle it. For example, it may become stuck, or you may want to add an attachment, or unload some cargo.
    • As soon as you touch it, no matter where it is or what it was doing, it is now “inactive” and must be carried to Base if it’s not already there.
    • While the robot is in Base, you prepare it for its next active period, and restart it.
    • These steps repeat (often with music, an announcer, and cheering in the background!), until the 2-1/2 minute match timer sounds (the timer never pauses during a match).
  • There are at least three matches at each tournament, and each one is a fresh chance for you to get your best score.
  • No match has anything to do with another, and only your best score counts specifically toward the Robot Performance Award.
  • If it is known in advance that a team will not have another team opposite them, a volunteer or “house” team should substitute. If you compete against an empty table, you get the points for any interactive missions.

Red Square 10 - Round

  • The process of cycling all teams through one match each is called a round.
  • Tournaments run at least three rounds.
  • Between your match in one round and the next, you usually have time to go to the pit area and work on your robot and its programs as needed, but this time may be limited, depending on the schedule of other proceedings.

Red Square 11 - Robot

Your robot is defined as the main body containing the NXT (or RCX) controller and anything that does not fall off when the main body is picked up, turned over (or flipped any way), and/or shaken.


Red Square 12 - Attachments

Attachments are defined as parts of your robot that are designed to be added and/or removed.


Red Square 13 - Strategic Objects

  • Strategic objects are defined as team-supplied objects which you or your robot may use as tools or aids.
  • You may touch or use strategic objects *only in Base, but your robot may touch or use them anywhere.
  • *Example: If you’re using a device to aim your robot, you need to either pull the device away or let go of it before your robot is allowed to start.

Red Square 14 - Mission Models

  • Mission models are defined as the objects that are already on a competition field when you walk up to it.
  • You may not bring duplicate mission models to the table if they could confuse scoring.
  • You may not take mission models apart, even temporarily.
  • Mission models must be separated from your team-supplied objects quickly after the match.
  • Be very careful not to leave the competition area with that field’s mission models.

Red Square 15 - Housekeeping

  • After the referee (the “ref”) inspects everything you’ve brought to the competition area, you may store it in Base and/or in a box on a stand where you can get to it quickly while operating your robot.
  • Team members other than the two at the table are not allowed to hold anything unless approved by the ref.
  • Nothing is allowed on the floor unless approved by the ref.
  • Mission models always need to stay in view of the ref.
  • In rare situations of crowding at Base, the ref allows you to store objects on the table away from Base, but only if it is obvious their placement is purely for storage.

Red Square 16 - Robot Preparation and Handling

  • Before the match, and whenever else your robot is inactive, you are allowed to handle it and prepare it by hand for its next active period.
  • Typical preparations include repairs, switching attachments, loading and unloading objects, selecting programs, resetting features, and manipulating, arranging, and aiming the robot and any objects it will be moving or using.
  • This work should be done in or near Base to avoid messing up the field.
  • Once your robot and its objects are ready to start, the last thing you must do is to let go of it all.

Red Square 17 - Muscle Actions

  • You may not cause things to extend, leave, or be placed out of Base, even partially, except as described in the START PROCEDURE and HOUSEKEEPING RULES.
  • You may not move or “adjust” anything outside of Base.
  • In Base, you are allowed to manipulate any objects that have reached Base, even to produce scoring conditions.
  • You may place objects completely in Base for an active robot to interact with, but only if you have obviously let go of them before your robot touches them.
  • As soon as your robot or anything it’s strategically controlling reaches Base, you may take it all (robot plus objects) into Base.
  • Dropping something on your active robot is treated as an active robot touch.

Red Square 18 - Start Position

  • For all starts beginning and during the match, every bit of your robot including its attachments and any objects it is about to move or use must fit completely in Base.
  • Nothing is allowed to be poking through the imaginary box.
  • Your robot is allowed, but not required, to touch objects it is about to move or use.
  • You must not be touching your robot or anything it is about to move or use.
  • Everything must be motionless.

Rule 18 - Start Position


Red Square 19 - Start Procedure

  • When it’s obvious to the ref that starting position is correct…
    • For the start of the match…
      • The ref asks you if you’re ready, then signal your readiness to the announcer.
      • As the countdown starts, you reach in with one hand, ready to either touch a button, or signal a sensor, to start or resume your robot’s program.
      • When you hear the sound, you start your robot.
    • For all other starts (restarts)…
      • There’s no countdown. The ref sees that you’re ready, and you start your robot.
  • You may not handle your robot, or anything it’s about to move or use, during or after the countdown. If you do, the ref has you restart. The point of this rule is to ensure that your only influence on your robot is to get its program running.
  • The exact time to start is at the beginning of the last word in the countdown, such as “Ready, set, GO!”
  • If a different signal is used, the start is at the beginning of that signal.

Red Square 20 - Active Robot <> Inactive Robot

  • At the moment your robot is started, it becomes “active” and remains so until the next time you touch it, or anything it is strategically controlling.
  • At the moment of that touch, the robot becomes inactive again, and must be carried to Base unless it’s already there. There may be additional **consequences.
  • The inactive robot in Base may then be handled/prepared and restarted.

Red Square 21 - Active Robot Touched COMPLETELY Out Of Base

If the robot and every object in its strategic control are completely out of Base…

  • a “touch penalty object” is taken out of play if one is available, as described in the missions.
  • objects that were with the robot the last time it left Base go to Base, for scoring or continued use.
  • objects that were not with the robot the last time it left Base are taken out of play (may not be used again).

Red Square 22 - Active Robot Touched In Base

If the robot or any objects in its strategic control are at least partially in Base…

  • there is no “touch penalty.”
  • those objects are placed in Base for scoring or continued use.

Red Square 23 - Tethers/Leashes

If the only part of your robot in Base at the time of an active robot touch is a cord, hose, wire, tube, chain or string, the robot is treated as if it were completely out of Base.


Red Square 24 - Loss Of Contact

If an untouched robot loses contact with an object, that object stays where it is unless/until the robot regains contact with it. Such objects may not be recovered by hand.

For exceptions, see the STRAY OBJECTS and ROBOT DAMAGE rules.


Red Square 25 - Stray Objects

  • Objects caused by any robot to be in a non-scoring position may be taken out of play by the ref upon request, or by you if the ref is too far away to act in time. Objects “taken out of play” may not be used again.
  • Objects in their original “setup” positions are never considered stray.
  • Objects in scoring position are never considered stray.

Red Square 26 - Robot Damage

At any time, you may recover robot parts that come off as a result of obviously unintentional damage.

  • You may do this by hand or request help from the ref.
  • Parts planned or designed to come off are strategic objects, and are covered under the LOSS OF CONTACT rule.

Red Square 27 - Field Damage

  • Field damage is defined as:
    • whenever a mission model is broken or malfunctioning.
    • whenever a Dual Lock connection is separated.
    • any change to your field that is not caused by your robot.
    • any change to your field that is caused by an inactive robot.
    • any change to your field that violates a rule or Game Q&A ruling.
  • When field damage occurs, the ref is placed in the difficult position of having to recall the field’s condition right before the damage, and restore it to that condition.
  • Field damage too severe to reverse is left as is or swept away.
  • If scoring is in question after field damage that was mostly due to faulty model design, construction, or setup, you get the points.
  • If scoring is in question after field damage that was mostly due to your robot acting with too much force and/or not enough accuracy (messing up), you are more likely to get the a “benefit of the doubt” call, along with a warning, in Round 1 than in later rounds.
  • It is not field damage and the field does not get restored when your robot simply does things you don’t like.

Red Square 28 - Interference

  • Your robot is not allowed to have any effect on the other team’s robot, field, or strategy, except by directly meeting the scoring requirements of missions in areas that are shared between the two sides by design of the Robot Game.
  • There is always at least one mission where you and the opposing team are set up to interact in some way, either competitively or cooperatively.
  • As a matter of luck, that team may be able to out perform you on that mission or may fail to cooperate with you there. This is not considered interference.

Red Square 29 - Final Field Condition

  • To minimize controversy about what happened during a match, the score is determined at the end of the match, by the SNAPSHOT condition of the field at that EXACT time only.
  • This means that points are not given for results your robot gets but then trashes before the match ends.
  • This is also why actions that are not allowed (rule violations) are either stopped or reversed as they happen.

Red Square 30 - IN

  • A is “in” area B if any bit of A is over area B.
  • Barely “in” is considered “in” unless the word “completely” is used.
  • Direct contact (touching) is not part of the definition of “in.”
  • Objects in a container are ruled on individually, and independent of their container.
  • Exception: Objects returning to Base with your robot are considered IN as soon as the robot reaches Base.

Rule 30 - In


Red Square 31 - TOUCHING

  • A is “touching” B only if A is making direct contact with B.
  • Any amount of direct contact counts as touching.

Rule 31 - Touching


Red Square 32 - Benefit of the Doubt

  • You get the benefit of the doubt when:
    • a split-second or the thickness of a (thin) line is a factor.
    • a situation could “go either way” due to confusing, conflicting, or missing information.
    • anyone other than the challenge designer claims to know the “intent” of a requirement or constraint.
  • If you (kids, not coach) disagree with the ref and can respectfully raise sufficient doubt in his/her mind, the ref meets with the head ref, and the resultant decision is final.
  • This rule is not an order for the refs to be lenient, but it is a license for them to make judgment calls in your favor when it’s reasonable to do so.

Red Square 33 - Precedence

  • When there is conflict between pictures/videos and text, the text takes precedence.
  • When there is conflict between a mission and a rule, the mission takes precedence, but the current Game Q&A page on the web takes overall precedence. MAKE SURE TO CHECK BACK THERE OFTEN.
  • The head ref is not obligated to consider calls made at previous tournaments unless those calls have been added to the latest Game Q&A.

Red Square 34 - After The Match

  • No one is allowed to touch anything on the field yet…
  • The ref first needs time to record the condition of the field, and come to agreement with you (kids) about what points were scored or missed and why (and to be sure you’re not walking away with any of that field’s mission models!). Data is marked on a sheet which you initial.
  • The scores are tallied by computer, with ties being broken using 2nd and then 3rd highest scores.

Red Square Challenge Support

  • Official Robot Game support is available through This e-mail address is being protected from spambots. You need JavaScript enabled to view it (usual response in 1-2 business days).
  • Before you e-mail, be sure you’ve read the Field Setup, the Missions, these Rules, and the updated Game Q&A, since flltech refers to these and only these, exactly as you and the refs are supposed to.
  • E-mail replies you get are only to guide you. Refs are not obligated to read them.
  • When e-mailing, please state your role on the team (member, coach, parent, mentor).
  • flltech can help you construct rule-based paths of reason for assessing special strategies or situations.
  • flltech may share the answer to your question on the Game Q&A if the question is popular, reveals missing or confusing text, reveals a flaw in the game, reveals an unresolvable conflict, or is amazing or entertaining.
  • No new Game Q&A entries are be posted after 3PM (eastern U.S.) on Fridays.
  • flltech does not answer questions about building or programming the robot (that’s your challenge).
  • flltech can not support LEGO product (RIS, RoboLab, NXT). Instead call 1-866-349-5346.
  • flltech does not respond to questions posted in the discussion forum. The forum is great for sharing ideas and getting tips from other teams, but it is NOT AN OFFICIAL SOURCE OF ANSWERS about anything.

Red Square Coaches’ Meeting

  • If a question does come up right before the tournament, your last chance to ask it is at the “Coaches’ Meeting” (if there is one) the morning of the tournament.
  • The head ref and coaches meet to identify and settle any differences before any matches start.
  • For the rest of the day, the ref’s calls are final when you leave the table.

Red Square Summary Of Significant Content Changes For 2009

A - The restriction against attaching things to mission models has been removed.

B - The robot and everything it has, can now be pulled into Base as soon as any of it reaches Base.

C - Stray objects must now be taken off the table if they’re going to be moved at all. Shifting is not allowed.

D - A tethering rule allows tethering while preventing teams from using it to avoid a touch penalty.

E - The definition of ON has been removed.