Addictive- I cant get a higher level if I just play one more time!

I like the challenge of this game. My kids even play it from time to time. I find it especially intriguing for the implications in telling the differences between the shades. It sounds crazy, but I swear it is harder to tell the blues and the greens.

Sdfgqwerty about Shades: A Simple Puzzle Game, v1.3.1