Visual test: only the cleverest solved this test in under 15 seconds!


This test is designed to stimulate your neurons and challenge your mind. It offers much more than numbers and equations. By noting this challengeyou’re on your way to solving complex problems.

The difficulty of this puzzle lies not only in the search for answers, but also in how to exercise strategic thinking and mathematical creativity.

Know that beyond the numbers lies an opportunity to become smarter, more astute, and hone your mind for the intellectual puzzles to come.

How does the challenge work?

In this mathematical challenge, your mental agility will be put to the test. The puzzle consists in finding a number from those surrounding a square, in under 15 seconds.

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The complexity lies in the need to combine these numbers as quickly as possible in a clever way to discover the missing digit.

The challenge tests your numeracy skills, but it also demands quick, strategic thinking. Time limits add extra pressure. This test puts your ability to solve problems under stress to the test.

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Get ready to push your limits and take on a challenge that will reveal the true level of your intelligence.

Some practical tips

Look for numbers that follow on from each other or that have a particular logic.

Find patterns of multiplication, division, addition or subtraction between numbers.

Consider the position of the numbers inside and outside the box.

If an operation is performed (such as multiplication), try to think of its inverse (division) to check whether it gives a plausible result.

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Quickly test obvious combinations to see if they give the answer you’re looking for.

Compare the numbers around the box to detect trends or patterns.

Numbers that have no direct correspondence with others can often be important in finding the answer.

The answer

Congratulations to all those who managed to solve the mystery by finding the number you were looking for. It was 18! Your perspicacity and speed in solving this challenge are simply impressive.

Here’s the solution: In the given puzzle,

5 × 8 = 40

5 × 6 = 30

8 × 3 = 24

6 × 3 = 18

The missing number is therefore 18.


You’ve demonstrated a remarkable mastery of mathematical tricks and outstanding mental agility.

For those who didn’t succeed this time, don’t be discouraged! These challenges are designed to stimulate thinking and learning.

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Every attempt is an opportunity to improve, and the simple act of participating already brings you closer to success. Keep practicing, exploring new strategies, and remember that every challenge you overcome strengthens your skills.

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