Only 1 per cent of people can find the odd number out in less than 10 seconds on this blackboard – can you?

Published on August 28, 2025 at 02:53 PM
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PUZZLE fans are challenged to test their vision to the max with this mind boggling brainteaser.

Everyone can see the chalk board, but only those with the sharpest eyes can spot the odd number out in 10 seconds.

Illustration of a chalkboard filled with the number 4502.
Can you spot the odd number out?

Whether you’re trying to  improve your sight , or  test your IQ , this puzzle will prove a challenge to many readers.

Put your  observation skills  to the test and figure out whether you have what it takes to the odd number out in just a few seconds.

At first glance, it looks like all of the numbers in the image, provided by Piktochart are exactly the same.

However, those with 20/20 vision will immediately spot that this is not the case.

One of the numbers, is in fact slightly different to the rest.

Unless you’re lucky enough to spot the odd number out straight away, we recommend analysing the image very closely.

The visual deception of this puzzle will have you peeling your eyes, but the payoff is worth it.

If you need a hint, we recommend focusing on the top half of the image.

The odd number out can be found on the right hand side of the picture.

If you’re looking for more of a challenge,  this clever puzzle  asks you to find the playing card suits that are the wrong colour.

Can you spot all 10 hazards & keep your pets safe this Bank Holiday in less than 53 seconds

And only those with the eyes of a hawk will be able to  spot the two odd items out  in this  summer  themed brainteaser.

Festival fans are challenged to  spot the drummer  hidden in this festival scene.

And finally,  jewellery  fans are urged to  locate the diamond ring  hidden at the beach in this summer puzzle.

How can optical illusions and brainteasers help me?

Engaging in activities like solving optical illusions and brainteasers can have many cognitive benefits as it can stimulate various brain regions.

Some benefits include:

  • Cognitive stimulation: Engaging in these activities challenges the brain, promoting mental agility and flexibility.
  • Problem-solving skills: Regular practice enhances analytical thinking and problem-solving abilities.
  • Memory improvement: These challenges often require memory recall and can contribute to better memory function.
  • Creativity: They encourage thinking outside the box, fostering creativity and innovative thought processes.
  • Focus and attention: Working on optical illusions and brainteasers requires concentration, contributing to improved focus.
  • Stress relief: The enjoyable nature of these puzzles can act as a form of relaxation and stress relief.

Coming back to our challenge, were you able to solve it in under 45 seconds?

For those struggling to find the answer, we have marked the solution for you.

Illustration of a chalkboard with the number 4052 highlighted among many instances of 4502.
Were you able to spot it?

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