Are you ready to test yourself with another brainteaser?

These puzzles are known to increase your memory power, boost brain activity, and improve concentration, so give it a try.

If you have trouble with this brain teaser, it simply means you need to give your brain a workout more often.

In this teaser, you are challenged to find all the hidden faces in the "National Leaders Tree."

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No one is certain when this optical illusion first came around, but it makes its rounds on the internet every few years.

While some people don't find it a struggle at all, others can only see a few of the hidden faces.

The number of faces you see says something important about your memory. So find all the faces that you can, count them up, and scroll down to see what your number says about your brain.

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Did you see two to four faces? The first two large illustrations are fairly obvious, but if you can only see one or two of the hidden faces, it could mean that you suffer from a memory disorder.

Did you spot five to six faces? If so, you may be at risk of dementia or Alzheimer's disease. Did you find seven or eight faces?

Your memory is good, but not great. Keep working at this type of puzzles to strengthen your cognitive skills.

Were you able to county nine or more faces? If you were able to see almost all the faces, then you have excellent facial recognition skills and a great memory.

Here's what the faces are hiding.

If you found the challenge to be easy, challenge yourself even more to name all the famous faces.

Some people claim to have seen Gandhi, Margaret Thatcher, Stalin, and Teddy Roosevelt.

Which famous people do you see? Share this puzzle challenge with your family and friends and see how many faces they see.

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