An optical illusion of four kiwis hidden among a group of kiwi birds has left a mystery.
The search and finding Challenge has frustrated even those with 20/20 vision.
The Mind Breaker requires tremendous concentration on even the smallest details of the illustration as it puts his powers of observation to the ultimate test.
Gergely Dudás, also known as Dudolf, is known for creating some of the most difficult brain teasers on the internet.
The German author recorded it Facebookwhere he has over 168,000 followers sharing the challenge.
There is a 20-second record to be broken, with the puzzlers aiming to be the fastest to discover all four kiwis.
Dudolf cleverly uses similar colors and shapes to make it difficult for even the most astute challengers to solve the problem.
At first glance, it’s hard to decide which area of the image is the best place to start searching.
The birds appear to be looking in different directions and there is no obvious pattern in the way they are drawn.
Have you already discovered kiwis?
Anyone who has difficulty distinguishing between kiwis and birds should take a closer look at their beaks.
Dudolf fans have admitted they had difficulty finding all four Kiwis.
One person commented: “I always enjoy finding a new puzzle from you!
“These Kiwis are shy little rascals, aren’t they?! I loved it as always! Thank you for the smiles and conversation today!”
Another wrote: “The fourth one took surprisingly long as always, thanks for the fun!”
A third added: “I had found three and I’m still looking for number four.”
The puzzle is more difficult to solve than it first seems.
Note: Try to focus on the birds on the right side of the image.
If you still can’t spot the four kiwis, scroll down to find the solution below.