Questions & Answers2021-08-30T15:16:03+02:00

Questions & Answers

At this page we will publish frequently asked and important questions related to the WRO® 2020 games. The answers on this page should be seen as additions to the rules and will be used for the WRO International Final. Be aware that in your country local competitions may follow slightly different rules. Always use the rules provided by your National Organizer.

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Regular Category

All age groups

Can the robot move barriers/fences and put them back in the right place?2021-08-20T15:19:51+02:00

“not moved or damaged” in the scoring table means: at the end of the run the barrier/fence is in the starting position

In WRO it is always the end-situation that is scored. This means that the robot can lift or move any barrier or fence during the run and then put it back.


How should the solar cell be placed on the robot at the start of the run?2021-08-20T15:20:27+02:00

“There is one solar cell that should be placed on the robot at the start of the run.”

What does this mean?

  • The team can choose how the robot brings the solar cell to the correct area.
  • They can put the cell on the robot, under the robot, in front of the robot or in any other position touching the robot.
  • They can even put the cell inside of the robot, but only if this does not delay the starting process.
    Meaning: During the start process they cannot remove pieces of LEGO from their robot, put the panel in and then put the pieces back.
  • The team cannot touch the solar cell anymore after the start.
  • Whatever option they choose: the solar cell cannot stick out of the start area.
    Meaning the projection of the cell and the robot need to be inside the start area.


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The wind turbine has fallen over but still only touches the relevant area.2021-08-20T15:23:56+02:00

The wind turbine could have fallen over during the run (is on its side) but still be only touching the relevant area.

In this case the wind turbine would count as ‘not moved or damaged’, because not moved in WRO means that it is still inside the designated area in the end situation.

The team is lucky and will get the bonus points.

When are Energy Units completely in house or storage battery?2021-08-20T15:23:15+02:00

Unfortunately there is an error in the calculation of one of the examples. This can lead to confusion.

An Energy Unit is completely in the house or storage battery if it only touches the area (= the field).

Units that are on top of another unit, or that are in any way supported by another unit or the fence of the storage battery will get no points.

See the corrected example for the house. (24 instead of 44 points.) And the extra example added. (Only points for the yellow unit in this case.)

To avoid further confusion:
“only touching” refers to how the unit is supported. It is OK if units that are fully supported by the field are just touching each other because they are next to each other.

wrong calculation


What is meant with: “the omni wheel components of a single wheel must be on one position on an axle”?2021-08-20T15:25:44+02:00

This means that the wheel cannot be devided over both sides of the motor.

See image for clarification.

How many wheels can I use?2021-08-20T15:24:37+02:00

Rule 8.9 for Football can cause some confusion, because it specifically mentions omni wheels.
It was written this way because almost all robot designs use omni wheels. But the intention of the rule is that each robot can have a maximum of three driven wheels in total.

Therefore the rule should be read as follows:

8.9 A maximum of three driven wheels – built of only LEGO branded components – can be used on a single robot. Use of a reciprocating kicker in the remaining EV3 output port is strongly recommended.

Open Category

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Future Engineers

The rules says that the color of the red sign has the following color “PANTONE 1795 C, RGB (238, 39, 55)” but RGB (238, 39, 55) does not corresponds to PANTONE 1795 C. Which color is correct?2021-08-20T15:30:31+02:00

The actual difference of these two colors is insignificant for the camera because the data get from the camera will really depends on the ambient light conditions. But in order to get rid of ambiguity in the rule statement, the recommended color is RGB (238, 39, 55).

Is it possible to prepare lesser number of red and green parallelepipeds rather than stated in the section 8.3?2021-08-20T15:29:57+02:00

Correct. Although the section 8.3 states that 8 red and 8 green signs must be prepared in advance to keep needs of the drawing procedure for the final round, actually, 5 red and 5 green parallelepipeds are enough – there will be no such variant of the colored objects combination that requires more than 5 objects of the same color.

Is it allowed to use two motors connected to one axel on the vehicle (it is not a differentiated wheelbase)?2021-08-20T15:29:27+02:00

The paragraph 9.2.3 of the rules says “the vehicle must be a 4 wheeled vehicle with one driving motor and one steering actuator of any type.”. So, if two motors connected to one axel are for driving, it is not allowed. If this approach is used by somehow for steering purposes, it could be considered as a steering actuator.

It seems that the sizes were not updated in the table of the “Appendix B. Game field for national/regional finals”, doesn’t it?2021-08-20T15:29:00+02:00

Yes, the proper table must look like the following, see photo.

Will the number of teams be reduced in the WRO 2021 International Final after the qualification round?2021-08-20T15:27:50+02:00

In general, the qualification round could be used to reduce the number of teams participating in the competition. But since WRO Future Engineers is the pilot in the season 2021, the qualification round will be used to allow teams get more points.

Should the match be stopped if the vehicle touches the sign?2021-08-20T15:27:13+02:00

As soon as the sign is pushed completely by the vehicle from the circle it is located initially the match will be stopped.