Here we go again with the latest head scratcher brainy boffins have devised to test your intellect.
They reckon that people who can solve the puzzle within 13 seconds have a high IQ. So what better way to test your own grey matter during a break from work?
The teaser is the latest in a series to get the cogs turning. The puzzles are billed as a great way of challenging cognitive skills, problem solving abilities and helping folk focus.
