[js2]

I don't understand the timed component. I can score 100% on this one:

http://www.xrite.com/online-color-test-challenge

But I ran out of time after getting 12 correct on the linked test. Edit: managed 28 after repeated attempts. I feel there is some luck of the draw here, depending upon which hues follow which previous hues, and the placement of the correct square.