Everyone knows that physical exercise is essential to keeping the body in shape, but what some people don’t realize is that mental exercises are also important in keeping the brain active and in shape. This is why various types of brain teasers have become so popular, as people all over the world regularly do different types of puzzles to pass the time and keep the mind sharp.

Some people love doing Sudoku, while others like doing the crossword puzzles in the New York Times. Now, one brain teaser is going viral that is so difficult that many people are saying that it is impossible to solve. Experts say that while the test is not impossible, you need to have a very specific type of brain to find the answer to it.

Some experts say that in order to figure this out, you need to have Obsessive Compulsive Disorder (OCD). Even someone with a mild form of OCD should be able to fill in the blanks enough to read the puzzle and solve it.

Just working on this puzzle for a few minutes will do wonders to sharpen the mind, even if you can’t solve it. This test will also teach you a lot about yourself in the process based on how you do in solving it.

Statistics say that when people with OCD took the test, they were able to score 15/15. If you’re curious as to whether or not you can solve this puzzle, try your hand at the puzzle below, and let us know how it goes in the comments section!