This tricky optical illusion has to be one of the most fun IQ test.Most people failed to spot the hidden heart. But if you ...

Most people will only go out of their way to do an IQ test for fun, quickly finding a free online test to see how smart they really are. Then there are those who feel they are smarter than the average ...

Optical illusion: Visual illusion images are more than just entertaining — they’re clever puzzles that challenge how your eyes and brain work together. These mind-twisting images confuse your visual ...

Can you do 3D puzzles...without using your hands? Our visual-spatial intelligence test assesses your ability to mentally manipulate 3D objects, a skill that has practical significance in everyday life ...