Optical illusions like this one to find a hidden number exploit your visual processing system and brain's ability to make assumptions in the absence of complete information. But if you possess sharp ...

Spot the hidden number 3 in a 9-second brain teaser optical illusion that tests observation, IQ, and visual perception skills ...

Test your observation skills with a challenging optical illusion! You have just 8 seconds to find hidden inverted numbers "35" and "85" within a grid of "35"s. This quick brain exercise sharpens your ...

There are several different ways to test observation skills withan IQ test. But, solving the brain teaser challenge ...