There are many different tests in this site and the goal is to frustrate the diliberate thinking. They call this type 1 thinking. By moving quickly it gets at the point where our "knee-jerk" reflexes are exposed. There is a body of work about this project and it is not just Harvard (is that a prejudice?) involved. The tests start off rather simply but then a second round splits or jumbles up what associations you may hold in your mind. Yes you will make errors and not all your results will be meaningful. I totally blew a couple of them. It happens, but overall I find this very interesting and revealing.