You may have seen this puzzle where you have to connect 9 dots with 4 straight lines without lifting the pen from the paper or going back on yourself — it’s a traditional ‘thinking outside the box’ puzzle.
If you can do the 4-line solution, you may be interested in trying the 9 dots, 3 lines version that I posted last Wednesday.
This week's challenge is to connect 9 dots with 1 line!
Next week's puzzle will be to connect 16 dots with 6 lines.
This puzzle is part of my collection of icebreakers, exercises and puzzles which can be found on LearningPages.org
Solution
The 1-line solution shown below involves placing the dots on the surface of the earth with a single line going around the planet three times!
If you object to this solution, the alternative is to use one very thick line.