Recently, a number of students on Khan Academy found a way to cheat by taking hints offline and not having them counted towards their online profile. When going through exercises on Khan Academy you answer the problems given to you and receive feedback on whether your answer was correct or incorrect. If you get stuck on a problem you are able to take hints and have that problem counted as incorrect. Check out this exercise if you want to try it yourself. The images below show the user getting a correct answer and taking a hint respectively.