[josephschmoe]

I had a similar problem with a couple of them. They felt completely indistinguishable to me. Got a 3.

A part of it is the fact this is on a computer monitor though. If you only got a few wrong, it's probably not a big deal.

[PhasmaFelis]

Huh. So most of them were distinguishable to you? Interesting.

I could tell a properly-placed color apart from the colors two or three spaces away from it, but not usually from its immediate neighbors. My main strategy was to assume that, if a color looked identical to each of its neighbors, it was in the right place. I got a 16, which seems decent enough.