Connect 9 Dots with Four Lines

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.

You'll find the solution below.

If you can do the 4-line solution, you may be interested in trying it with 3 lines or even 1 line!

I'll be posting the 3-line version next week, and the 1-line version the week after.

This puzzle is part of my collection of icebreakers, exercises and puzzles which can be found on LearningPages.org

Solution