At first glance, this black-and-white puzzle looks simple: one large circle with four smaller circles inside it. Because of its clean symmetry, many people assume the answer is obvious—but the trick is that it tests attention, not math.
Each of the four inner circles actually contains two smaller circles stacked vertically. These are often mistaken as a single “8” shape, which leads people to undercount.
To solve it correctly, you must count everything separately:
- 1 large outer circle
- 4 medium circles inside it
- 8 small circles inside those
So the total is: 1 + 4 + 8 = 13 circles.
Most people miss this because the brain groups familiar shapes too quickly. The puzzle works by exploiting that visual shortcut, forcing you to slow down and count carefully.
Final answer: 13 circles.