Sometimes, the best way to get your brain going is by solving a few simple puzzles. If you want to challenge yourself, you might find this puzzle tougher than it looks at first. It seems easy, but it’s actually confusing even some very smart people. Do you think you can solve it?

The puzzle asks: how many triangles can you find in this picture? You need to look at every shape inside the larger triangle. Think about what makes a triangle. This puzzle can be tricky the more you look at it and try to figure out the answer. Do you think you know how many there are? It might take you a few tries to get it right. Some people have tried this puzzle many times before giving up.

Many people have answered this question, but only a few got it right. Did you guess 4 or 10? Surprisingly, the correct answer is 18. How is that possible? If you look at the example above, you’ll see that the person considered every part of the triangle. It’s not just about the lines; you also need to think about the shapes that the lines create. This puzzle really tests your math skills and how well you can notice small details.