It's not time to check your observation, and the game DifFriends will be the best simulator. You will both rest and practice visual perception. At five levels, you will see pairs of identical pictures before you, but they seem identical only to inattentive observers, you do not belong to their number and the rhythm will begin to notice the differences. There are seven in each level. It can be anything: an extra strip of shadow, a modified length of the sleeve, an object located in the mirror image. If you could not find the difference, use the hint button, it will transfer you to a new page where all the searched items are marked.