I got a zero which oddly is a good thing. It reminds me of the HIV negative test/skit Daniel Tosh did. Wish I didn't close the page before knowing to use the Http for image. Oh well, it's a learning curve. I'm going to have my cousins try this today at thanksgiving. They are both blue/green color blind and it should be interesting. Oh yeah, for those that scored high I wonder if this would help the score and reduce error. As a strategy try move all color similar to one side and the other colors to the opposite side then work towards the middle from each end. Also when working towards the middle, once you started with the obvious color, to determine the correct position of a square test by moving it one spot forward and one spot back and this should reduce the error and give a truer score.
I got zero, went to take a screenshot and pressed F5 because I'm extremely clever. I blame it on the time being nearly 4am. I've done this test before about a year ago and got zero with f.lux on, this time I turned it off and found it very easy, it didn't take me more than 10 minutes or so.
I am super blessed with awesome vision. Probably because my sense of smell and hearing sucks. I have constant sinus problems and have tinnitus. So there's that.