Large climbing rope.


  1. Tie three or more simple overhand knots in the rope.
  2. Ask all the group members to hold on to the rope.
  3. Ask the group members to untie the knots, without letting go of the rope.
  4. Sliding your hand up and down the rope is permissible.
  5. We have also asked groups to tie knots in the rope using the same format. For some reason, tieing is more difficult than untieing... Any explanations for that? :)