Is there a way to find/more obviously highlight uncolored squares??

[Keiko]

I've been searching the image square by square for almost 20 minutes, I've missed a single square somewhere but I can't FIND it. Help??

[L. Stotch]

Activate a color you can't find.
The light bulb icon to the right of the Inspector (hotkey H).
If it's hard to see, then you can expand Inspector to full screen, the icon above the light bulb (hot key M).

Good luck!

[Nocturnus]

Got kind of the same problem. It's the beach pic. The final of EP No. 1. It looks like I missed one single pixel somewhere but I can't find it anywhere. Even with the light bulb 'trick' I am unable to find anything. Maybe the pixel is just too small when I open the full screen black/white version of the picture or it is some kind of bug. I even switched through the colors you can highlight uncolored pixel with hoping to see a color changing pixel somewhere in the corner of my eye or something like that, but no luck. Is there possibly some other trick?

[L. Stotch]

Then only Joe will help you.