This game involves spotting small differences between two shades of the same colour. It advertises itself as a free colour vision test. I don’t know if that is accurate, but I did have a good time playing it.
I made it to level 31 before I could no longer tell the colours apart. The game says that this is a better result than 92.7% of the world’s population. (I’m not sure if I believe that, although it might be true!
What were your results?