A mind-boggling new brainteaser, created by Feel Good Contacts, is leaving people scratching their heads, as they race against time to spot an odd number in a sea of letters in just 15 seconds.

In today's optical illusion, we challenge viewers to find the hidden number 99 among a sea of 7s and 6s. This brain teaser tests observation skills and visual perception, sparking curiosity and ...

The odd number is 15, and you’ll find it in the second-to-last row, sixth circle from the left (or fourth from the right). It’s in a green circle, among other circles showing “12.” ...

This brainteaser asks you to find the odd number out in just 12 seconds. In the image above are a sea of 8831s and 883s, your task is to find the 8881 in under 12 seconds.

This number game optical illusion will keep you busy and engaged for a long time. The image comprises the number 775 and the challenge is to find one odd number in this image.

Here's a new challenge for you. In this colorful image you have to find out the odd number in 5 seconds. Can you solve this? This image has the number 41 in rows and columns in various colors.

Spot the odd number in under nine seconds. The image shows a sea of number nines - but there is an odd digit sneakily hiding in between. And your job is to find it as quickly as possible.

If you can spot the odd one out number sequence in just 40 seconds, you have the eyes of a hawk Credit: Tombola. Whether you're trying to improve your sight, or test your IQ, this puzzle will ...