BRAIN teaser fans have been left baffled by this mind-bending optical illusion. Puzzlers have been challenged to count how many triangles are hidden in the picture - but it's harder than you think.

THE infuriating thing about optical illusions is that either you can see through them straight away - or you're just never going to get it. And the latest brainteaser dividing the internet is no ...

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 ...