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If the robot did not perform the siren sound etc, so it will not get any score for mission 4, right?

Yes

In the video and guide book, it is written that can not use the string in 1261, so must use other string?

Yes, for "the cable car" ,can only be built using the components in the box #1261. The transparent plastic box (#1033) and the 2000mm STRING (R39-W85-200) can not be used.

2025 R4M Basic and Advanced Robot can use #18650 battery, right?

Yes

can a team change the design during the 6 minutes competition?

It is allowed to arrange command cards, map cards, and modify the robot's appearance or mechanism within 6 minutes competition. However, any changes to the appearance or mechanism must still comply with the size limitations.

For 8.2.2 If the robot needs to be repaired, the contestant must raise hand after receiving permission to intervene from a judge. Here should change "after" to "before"

Yes,the contestant raises their hand first. Then they wait for the judge's permission. Finally, they repair the robot.

If one of the team member said "Finish" before 2 minutes contest time, but the other member then say "not yet", so how? can they continue?

Since the judges have already paused the timer, the competition cannot continue.