A series of mind-boggling puzzles have been sweeping the web - but the latest might be the toughest yet. The tricky test features three main images - two triangles and a hexagon. Each shape is divided ...

A fiendishly tricky optical illusion challenging people to find all of the triangles in the image is the latest puzzle driving the internet to distraction. The drawing - which was shared on the ...

A brainteaser has swept social media and left many confused - as the optical illusion image asks if you can count 18 triangles in a simple black and white drawing. According to experts, only those ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An unusual triangle ...