A fiendishly tricky riddle has internet users all over the world stumbling.
The brainteaser presents the viewer with a grid of nine dots arranged in a square of three lines of three.
To beat it you need to connect each point with three straight lines drawn with a pencil or pen.
The highlight is that you cannot lift your writing instrument from the page at any point.
That makes it all but impossible unless you use some cheeky (or ingenious) trick.
The riddle has been making the rounds online for years, and last year it went viral again posted on TikTok.
The puzzle cannot be completed if you stay within the limits of the grid.
However, there’s nothing stopping you from dragging outside the grid to beat it.
In User Boardsdirect’s TikTok video, the person simply draws longer lines that go well beyond the edges of the puzzle.
You can then trim back to cross the pencil through each point in the grid.
It’s simple but effective and has been driving people insane in comments below the post.
“Think outside the box,” wrote one user.
It’s not the only devilish riddle making the rounds on TikTok.
Last week we covered an emoji brain teaser that asks you to solve an equation using the solution of three equations that have been filled in for you.
It’s a simple algebraic problem that’s a lot trickier than it looks.
The riddle has been making the rounds on social media in the past and was recently shared on TikTok by a passing user @puzzlegame21.
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https://www.thesun.ie/tech/9088915/youre-genius-solve-tricky-three-line-puzzle/ You’re a genius if you can solve the tricky “three line puzzle” in 10 seconds