"Unfortunately, there is no good way to compare the results across computers. For example, "suppression" is weaker at low contrast, so somebody will have a weaker suppression looking at the video in a bright room than in a dark environment. Also the actual monitor frame rate will make a big difference. What can be compared is if two people look at the video under same conditions.
This provides the same info:http://www.telegraph.co.uk/science/science-video/10076355/US-scientists-unveil-new-IQ-measure-take-the-test.html
So, this is why you will need a friend. However, the results could potentially damage the friendship. I leave that dilemma to you.