It's actually not an ADHD test. I have ADHD and have taken several medical ADHD tests before. This is a colorblindness test. While it has no bearing on what type of ADHD you have, it does relate to the different types of colorblindness. Someone with one type of colorblindness might see the X, while others might see the R. We (you and me at least) see a K because we aren't colorblind (as far as I know). Main point: This is a scam. It has nothing to do with ADHD. Anyone who isn't colorblind will see a K, regardless of weather or not they're neurodivergeant.