Few will be able to find the extra number in the picture
What does solving puzzles give us?
First, it increases self-esteem, you can feel good about the feeling of successfully overcoming the task.
Second, it trains the brain. Third, it develops intelligence.
This time we suggest you to take an alertness test by looking at the picture below. It shows the exact same numbers.
However, another number is still hidden among the eights. You have to find him in 5 seconds.
If everything works out, you can consider yourself the owner of perfect vision and excellent intelligence.