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Took the test and got a 0, but strange thing I noticed during the test was that "wiping" the cursor over the colored blocks during the test seemed to increase the saturation of the blocks, making the test much easier.

(Macbook Air, non-retina, Chrome 43.0.2357.134 (64-bit))

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I also got a zero, and I just barely noticed what you mean--I think it had to do with the white cursor being over the block.

Probably similar to this illusion: https://en.wikipedia.org/wiki/Checker_shadow_illusion

I noticed I had to spend a lot of time in the bottom two rows near the ends--in the purples, for instance, it was near-impossible for me to tell the last three tiles apart.

Also zero. I just did clustering and then insertion sort. It seemed obvious where each color belonged.

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