Some viral posts on Facebook refuse to die -- especially when they challenge users' intelligence. For the past couple of years, this quiz has been periodically popping up on the social media service to test the mental muscles of more than three million users. Apparently, solving the puzzle proves you have a higher IQ than the average person. Have a plug and see how you go!
I don't claim to be the sharpest knife in the cutlery drawer -- I once recorded an entire phone interview with my microphone in the wrong ear. Nevertheless, it took me about 10 seconds to work out this puzzle. Either I'm way smarter than I give myself credit for, or whoever created it was motivated by maximum shares.
The solution is dead easy once you've worked out the pattern. Let me know how long it took you to work out in the comments section below.
If you're completely stumped, the video below contains a detailed breakdown from puzzle enthusiast Presh Talwalkar. (Note: You need to CLICK on the BOX with your LEFT MOUSE BUTTON to make it play.)