[snogglethorpe]

I got 23.

I know I'm a typical "partially color blind" male, e.g. I always fail those tests where they show you an image made of a bunch of colored dots and ask what number you see, but on this test, I found I could find the outlier much more easily by using my peripheral vision: staring directly at it the grid, all the squares would look the same, but by looking to the side and sort of scanning with the edge of my vision, one would suddenly jump out...

[rs232]

27 here ("Wow, you have excellent colour vision.") with fairly typical red/green colorblindness. I also fail the the Ishihara plate (dots) test like clockwork.

Does this test different hues (or brightness even?) of the same color rather than the red/green blue/purple of the dots? (Can't tell myself, am after all colorblind.)

This test seems to be about something else rather than traditional colorblindedness.