Seeing as other people sounded like they had a hard time, I took a long time taking the test. My eyes hurt after a while (I think it's because the light cones get saturated) so I'm taking a break. After ten minutes of taking this, I literally couldn't see straight; the lines on the page looked like squiggles.

Update: got 19 (best is 0). Small problems across the map, in yellows, cyans, light purples, and pinks.

http://i35.tinypic.com/2lm6mi1.jpg