Purple is the killer for me.

Pro-level!

That level is hard! I find myself sweeping my eyes over the grid, looking away, then back a few times before I can see it.

App said I was in the 5 percent. Lol, the 4 color vision people must rule the roost! Us standard RGB types can throw a few solid punches...

Agreed with other commenter: green is killer.

Haha, everyone says green is the hardest but I keep tripping over purple!!

Is that true for all displays you have used?

Purple is harder when I use the AMOLED cinema and photo options on my phone.

I want to try this on a CRT, Plasma, LCD.

I have all these. Be right back!

Ok, will have to be this evening. Check back for some data.

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Very Interesting to know! The convenience store is such a big part of the culture in Japan.