The challenge is to find out the Odd Number “16” in this Numerical Optical Illusion. Can you prove you have an IQ level of 169 or higher with 20/20 vision?

Only 1% can spot the hidden odd number in this ‘421’ numerical optical illusion. Test your observation, IQ, and Hawk–Eye vision in this fun brain teaser.

The Odd Number has announced new appointments, with Sinqobile Mjali appointed managing director and Thabang ‘Tipi’ Manyelo taking up the position of executive creative director.

Can you find the odd number, which is 9, and prove your visual IQ? Test your observation skills with this optical illusion featuring a sea of 8s!

Optical illusion: There is one odd word, 'lose', hidden in this grid featuring the word 'rose.' Only sharp-eyed people can find the answer in seven seconds.

Optical-illusion challenge: A 13×11 grid filled with “858” plays a trick on the eyes - only one box is different. Can you find the odd number before time runs out?

The challenge is simple yet deceptive, find the odd number out without letting your eyes trick you? Illusions such as this, trick our visual field.

Take a look at the picture given below. The image is of a board full of numbers. If you take a closer look, you will realise ...

Find the 2o2 in the grid of 202s in just 12 seconds. Only 1 in 10 people can complete this challenge. Optical illusions are spreading like wildfire on the internet.

See how sharp you are by trying this brainteaser that asks you to identify the odd one out among a pile of dice – but be ...

Benjamin Hill travels the nation collecting stories about what makes Minor League Baseball unique. This excerpt from the ...