Test your observation skills with this tricky optical illusion! Only those with perfect 6/6 vision can spot the hidden star ...

To the untrained eye, the frog seems to vanish into the greenery. Yet, with enough patience and a sharp focus, some users ...

Test your observation skills with this fun optical illusion! Spot the odd Mario with a 'W' on his cap in just 5 seconds and ...

HERE’S a puzzling brain teaser that will test your eyesight and intelligence. Everyone can see the pearls, but you will need ...

Optical illusions have always intrigued the internet, captivating audiences with visual puzzles that test perception, pattern ...

Test your observational skills with this quick brainteaser! Can you spot the beggar who's secretly well-off in just five ...

ONLY 15% of of millennials can spot the correct hidden image in this blurred optical illusion – but can you do it in less ...

A mind-bending brainteaser challenges viewers to spot a critical error in judgment. The puzzle depicts four men perched on ...

This fun optical illusion tests your ability to focus. The cluster of related words conceals a word. Task: Within 7 seconds, ...

An optical illusion has been circulating online that claims to be able to tell you something about your personality based on ...

This fun optical illusion tests your ability to focus! The cluster of related numbers conceals a number. Within 5 seconds, ...

When the new book Champions of Illusion: The Science Behind Mind-Boggling Images and Mystifying Brain Puzzles arrived at the Mental Floss offices, we couldn't flip through it—and flip our brains ...