Cubadebate

offers you the following challenge.

Since there are many numbers in the illustration, finding 9 is not easy.

But you have something in your favor: there is no time limit here.

That means you can search calmly.

Nobody rushes you in this test.

Let's go!

Let us know in the comments if you were able to solve the challenge.

See also:

Viral challenge: You are able to solve the mathematical puzzle of cups in just 15 seconds